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ARM:

Browse Source 
- New page table code for both hypervisor and guest stage-2
 - Introduction of a new EL2-private host context
 - Allow EL2 to have its own private per-CPU variables
 - Support of PMU event filtering
 - Complete rework of the Spectre mitigation
 
 PPC:
 - Fix for running nested guests with in-kernel IRQ chip
 - Fix race condition causing occasional host hard lockup
 - Minor cleanups and bugfixes
 
 x86:
 - allow trapping unknown MSRs to userspace
 - allow userspace to force #GP on specific MSRs
 - INVPCID support on AMD
 - nested AMD cleanup, on demand allocation of nested SVM state
 - hide PV MSRs and hypercalls for features not enabled in CPUID
 - new test for MSR_IA32_TSC writes from host and guest
 - cleanups: MMU, CPUID, shared MSRs
 - LAPIC latency optimizations ad bugfixes
 
 For x86, also included in this pull request is a new alternative and
 (in the future) more scalable implementation of extended page tables
 that does not need a reverse map from guest physical addresses to
 host physical addresses.  For now it is disabled by default because
 it is still lacking a few of the existing MMU's bells and whistles.
 However it is a very solid piece of work and it is already available
 for people to hammer on it.
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Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm

Pull KVM updates from Paolo Bonzini:
 "For x86, there is a new alternative and (in the future) more scalable
  implementation of extended page tables that does not need a reverse
  map from guest physical addresses to host physical addresses.

  For now it is disabled by default because it is still lacking a few of
  the existing MMU's bells and whistles. However it is a very solid
  piece of work and it is already available for people to hammer on it.

  Other updates:

  ARM:
   - New page table code for both hypervisor and guest stage-2
   - Introduction of a new EL2-private host context
   - Allow EL2 to have its own private per-CPU variables
   - Support of PMU event filtering
   - Complete rework of the Spectre mitigation

  PPC:
   - Fix for running nested guests with in-kernel IRQ chip
   - Fix race condition causing occasional host hard lockup
   - Minor cleanups and bugfixes

  x86:
   - allow trapping unknown MSRs to userspace
   - allow userspace to force #GP on specific MSRs
   - INVPCID support on AMD
   - nested AMD cleanup, on demand allocation of nested SVM state
   - hide PV MSRs and hypercalls for features not enabled in CPUID
   - new test for MSR_IA32_TSC writes from host and guest
   - cleanups: MMU, CPUID, shared MSRs
   - LAPIC latency optimizations ad bugfixes"

* tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm: (232 commits)
  kvm: x86/mmu: NX largepage recovery for TDP MMU
  kvm: x86/mmu: Don't clear write flooding count for direct roots
  kvm: x86/mmu: Support MMIO in the TDP MMU
  kvm: x86/mmu: Support write protection for nesting in tdp MMU
  kvm: x86/mmu: Support disabling dirty logging for the tdp MMU
  kvm: x86/mmu: Support dirty logging for the TDP MMU
  kvm: x86/mmu: Support changed pte notifier in tdp MMU
  kvm: x86/mmu: Add access tracking for tdp_mmu
  kvm: x86/mmu: Support invalidate range MMU notifier for TDP MMU
  kvm: x86/mmu: Allocate struct kvm_mmu_pages for all pages in TDP MMU
  kvm: x86/mmu: Add TDP MMU PF handler
  kvm: x86/mmu: Remove disallowed_hugepage_adjust shadow_walk_iterator arg
  kvm: x86/mmu: Support zapping SPTEs in the TDP MMU
  KVM: Cache as_id in kvm_memory_slot
  kvm: x86/mmu: Add functions to handle changed TDP SPTEs
  kvm: x86/mmu: Allocate and free TDP MMU roots
  kvm: x86/mmu: Init / Uninit the TDP MMU
  kvm: x86/mmu: Introduce tdp_iter
  KVM: mmu: extract spte.h and spte.c
  KVM: mmu: Separate updating a PTE from kvm_set_pte_rmapp
  ...
This commit is contained in:
Linus Torvalds 2020-10-23 11:17:56 -07:00
commit f9a705ad1c
119 changed files with 8377 additions and 4909 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

216
Documentation/virt/kvm/api.rst
View File

@ -4498,11 +4498,14 @@ Currently, the following list of CPUID leaves are returned:
- HYPERV_CPUID_ENLIGHTMENT_INFO
- HYPERV_CPUID_IMPLEMENT_LIMITS
- HYPERV_CPUID_NESTED_FEATURES
- HYPERV_CPUID_SYNDBG_VENDOR_AND_MAX_FUNCTIONS
- HYPERV_CPUID_SYNDBG_INTERFACE
- HYPERV_CPUID_SYNDBG_PLATFORM_CAPABILITIES
HYPERV_CPUID_NESTED_FEATURES leaf is only exposed when Enlightened VMCS was
enabled on the corresponding vCPU (KVM_CAP_HYPERV_ENLIGHTENED_VMCS).
Userspace invokes KVM_GET_SUPPORTED_CPUID by passing a kvm_cpuid2 structure
Userspace invokes KVM_GET_SUPPORTED_HV_CPUID by passing a kvm_cpuid2 structure
with the 'nent' field indicating the number of entries in the variable-size
array 'entries'. If the number of entries is too low to describe all Hyper-V
feature leaves, an error (E2BIG) is returned. If the number is more or equal
@ -4704,6 +4707,106 @@ KVM_PV_VM_VERIFY
Verify the integrity of the unpacked image. Only if this succeeds,
KVM is allowed to start protected VCPUs.
4.126 KVM_X86_SET_MSR_FILTER
----------------------------
:Capability: KVM_X86_SET_MSR_FILTER
:Architectures: x86
:Type: vm ioctl
:Parameters: struct kvm_msr_filter
:Returns: 0 on success, < 0 on error
::
struct kvm_msr_filter_range {
#define KVM_MSR_FILTER_READ (1 << 0)
#define KVM_MSR_FILTER_WRITE (1 << 1)
__u32 flags;
__u32 nmsrs; /* number of msrs in bitmap */
__u32 base; /* MSR index the bitmap starts at */
__u8 *bitmap; /* a 1 bit allows the operations in flags, 0 denies */
};
#define KVM_MSR_FILTER_MAX_RANGES 16
struct kvm_msr_filter {
#define KVM_MSR_FILTER_DEFAULT_ALLOW (0 << 0)
#define KVM_MSR_FILTER_DEFAULT_DENY (1 << 0)
__u32 flags;
struct kvm_msr_filter_range ranges[KVM_MSR_FILTER_MAX_RANGES];
};
flags values for ``struct kvm_msr_filter_range``:
``KVM_MSR_FILTER_READ``
Filter read accesses to MSRs using the given bitmap. A 0 in the bitmap
indicates that a read should immediately fail, while a 1 indicates that
a read for a particular MSR should be handled regardless of the default
filter action.
``KVM_MSR_FILTER_WRITE``
Filter write accesses to MSRs using the given bitmap. A 0 in the bitmap
indicates that a write should immediately fail, while a 1 indicates that
a write for a particular MSR should be handled regardless of the default
filter action.
``KVM_MSR_FILTER_READ | KVM_MSR_FILTER_WRITE``
Filter both read and write accesses to MSRs using the given bitmap. A 0
in the bitmap indicates that both reads and writes should immediately fail,
while a 1 indicates that reads and writes for a particular MSR are not
filtered by this range.
flags values for ``struct kvm_msr_filter``:
``KVM_MSR_FILTER_DEFAULT_ALLOW``
If no filter range matches an MSR index that is getting accessed, KVM will
fall back to allowing access to the MSR.
``KVM_MSR_FILTER_DEFAULT_DENY``
If no filter range matches an MSR index that is getting accessed, KVM will
fall back to rejecting access to the MSR. In this mode, all MSRs that should
be processed by KVM need to explicitly be marked as allowed in the bitmaps.
This ioctl allows user space to define up to 16 bitmaps of MSR ranges to
specify whether a certain MSR access should be explicitly filtered for or not.
If this ioctl has never been invoked, MSR accesses are not guarded and the
default KVM in-kernel emulation behavior is fully preserved.
Calling this ioctl with an empty set of ranges (all nmsrs == 0) disables MSR
filtering. In that mode, ``KVM_MSR_FILTER_DEFAULT_DENY`` is invalid and causes
an error.
As soon as the filtering is in place, every MSR access is processed through
the filtering except for accesses to the x2APIC MSRs (from 0x800 to 0x8ff);
x2APIC MSRs are always allowed, independent of the ``default_allow`` setting,
and their behavior depends on the ``X2APIC_ENABLE`` bit of the APIC base
register.
If a bit is within one of the defined ranges, read and write accesses are
guarded by the bitmap's value for the MSR index if the kind of access
is included in the ``struct kvm_msr_filter_range`` flags. If no range
cover this particular access, the behavior is determined by the flags
field in the kvm_msr_filter struct: ``KVM_MSR_FILTER_DEFAULT_ALLOW``
and ``KVM_MSR_FILTER_DEFAULT_DENY``.
Each bitmap range specifies a range of MSRs to potentially allow access on.
The range goes from MSR index [base .. base+nmsrs]. The flags field
indicates whether reads, writes or both reads and writes are filtered
by setting a 1 bit in the bitmap for the corresponding MSR index.
If an MSR access is not permitted through the filtering, it generates a
#GP inside the guest. When combined with KVM_CAP_X86_USER_SPACE_MSR, that
allows user space to deflect and potentially handle various MSR accesses
into user space.
If a vCPU is in running state while this ioctl is invoked, the vCPU may
experience inconsistent filtering behavior on MSR accesses.
5. The kvm_run structure
========================
@ -4869,14 +4972,13 @@ to the byte array.
.. note::
For KVM_EXIT_IO, KVM_EXIT_MMIO, KVM_EXIT_OSI, KVM_EXIT_PAPR and
KVM_EXIT_EPR the corresponding
operations are complete (and guest state is consistent) only after userspace
has re-entered the kernel with KVM_RUN. The kernel side will first finish
incomplete operations and then check for pending signals. Userspace
can re-enter the guest with an unmasked signal pending to complete
pending operations.
For KVM_EXIT_IO, KVM_EXIT_MMIO, KVM_EXIT_OSI, KVM_EXIT_PAPR,
KVM_EXIT_EPR, KVM_EXIT_X86_RDMSR and KVM_EXIT_X86_WRMSR the corresponding
operations are complete (and guest state is consistent) only after userspace
has re-entered the kernel with KVM_RUN. The kernel side will first finish
incomplete operations and then check for pending signals. Userspace
can re-enter the guest with an unmasked signal pending to complete
pending operations.
::
@ -5163,6 +5265,44 @@ Note that KVM does not skip the faulting instruction as it does for
KVM_EXIT_MMIO, but userspace has to emulate any change to the processing state
if it decides to decode and emulate the instruction.
::
/* KVM_EXIT_X86_RDMSR / KVM_EXIT_X86_WRMSR */
struct {
__u8 error; /* user -> kernel */
__u8 pad[7];
__u32 reason; /* kernel -> user */
__u32 index; /* kernel -> user */
__u64 data; /* kernel <-> user */
} msr;
Used on x86 systems. When the VM capability KVM_CAP_X86_USER_SPACE_MSR is
enabled, MSR accesses to registers that would invoke a #GP by KVM kernel code
will instead trigger a KVM_EXIT_X86_RDMSR exit for reads and KVM_EXIT_X86_WRMSR
exit for writes.
The "reason" field specifies why the MSR trap occurred. User space will only
receive MSR exit traps when a particular reason was requested during through
ENABLE_CAP. Currently valid exit reasons are:
KVM_MSR_EXIT_REASON_UNKNOWN - access to MSR that is unknown to KVM
KVM_MSR_EXIT_REASON_INVAL - access to invalid MSRs or reserved bits
KVM_MSR_EXIT_REASON_FILTER - access blocked by KVM_X86_SET_MSR_FILTER
For KVM_EXIT_X86_RDMSR, the "index" field tells user space which MSR the guest
wants to read. To respond to this request with a successful read, user space
writes the respective data into the "data" field and must continue guest
execution to ensure the read data is transferred into guest register state.
If the RDMSR request was unsuccessful, user space indicates that with a "1" in
the "error" field. This will inject a #GP into the guest when the VCPU is
executed again.
For KVM_EXIT_X86_WRMSR, the "index" field tells user space which MSR the guest
wants to write. Once finished processing the event, user space must continue
vCPU execution. If the MSR write was unsuccessful, user space also sets the
"error" field to "1".
::
/* Fix the size of the union. */
@ -5852,6 +5992,28 @@ controlled by the kvm module parameter halt_poll_ns. This capability allows
the maximum halt time to specified on a per-VM basis, effectively overriding
the module parameter for the target VM.
7.21 KVM_CAP_X86_USER_SPACE_MSR
-------------------------------
:Architectures: x86
:Target: VM
:Parameters: args[0] contains the mask of KVM_MSR_EXIT_REASON_* events to report
:Returns: 0 on success; -1 on error
This capability enables trapping of #GP invoking RDMSR and WRMSR instructions
into user space.
When a guest requests to read or write an MSR, KVM may not implement all MSRs
that are relevant to a respective system. It also does not differentiate by
CPU type.
To allow more fine grained control over MSR handling, user space may enable
this capability. With it enabled, MSR accesses that match the mask specified in
args[0] and trigger a #GP event inside the guest by KVM will instead trigger
KVM_EXIT_X86_RDMSR and KVM_EXIT_X86_WRMSR exit notifications which user space
can then handle to implement model specific MSR handling and/or user notifications
to inform a user that an MSR was not handled.
8. Other capabilities.
======================
@ -6193,3 +6355,39 @@ distribution...)
If this capability is available, then the CPNC and CPVC can be synchronized
between KVM and userspace via the sync regs mechanism (KVM_SYNC_DIAG318).
8.26 KVM_CAP_X86_USER_SPACE_MSR
-------------------------------
:Architectures: x86
This capability indicates that KVM supports deflection of MSR reads and
writes to user space. It can be enabled on a VM level. If enabled, MSR
accesses that would usually trigger a #GP by KVM into the guest will
instead get bounced to user space through the KVM_EXIT_X86_RDMSR and
KVM_EXIT_X86_WRMSR exit notifications.
8.25 KVM_X86_SET_MSR_FILTER
---------------------------
:Architectures: x86
This capability indicates that KVM supports that accesses to user defined MSRs
may be rejected. With this capability exposed, KVM exports new VM ioctl
KVM_X86_SET_MSR_FILTER which user space can call to specify bitmaps of MSR
ranges that KVM should reject access to.
In combination with KVM_CAP_X86_USER_SPACE_MSR, this allows user space to
trap and emulate MSRs that are outside of the scope of KVM as well as
limit the attack surface on KVM's MSR emulation code.
8.26 KVM_CAP_ENFORCE_PV_CPUID
-----------------------------
Architectures: x86
When enabled, KVM will disable paravirtual features provided to the
guest according to the bits in the KVM_CPUID_FEATURES CPUID leaf
(0x40000001). Otherwise, a guest may use the paravirtual features
regardless of what has actually been exposed through the CPUID leaf.

88
Documentation/virt/kvm/cpuid.rst
View File

@ -38,64 +38,64 @@ returns::
where ``flag`` is defined as below:
================================= =========== ================================
flag value meaning
================================= =========== ================================
KVM_FEATURE_CLOCKSOURCE 0 kvmclock available at msrs
0x11 and 0x12
================================== =========== ================================
flag value meaning
================================== =========== ================================
KVM_FEATURE_CLOCKSOURCE 0 kvmclock available at msrs
0x11 and 0x12
KVM_FEATURE_NOP_IO_DELAY 1 not necessary to perform delays
on PIO operations
KVM_FEATURE_NOP_IO_DELAY 1 not necessary to perform delays
on PIO operations
KVM_FEATURE_MMU_OP 2 deprecated
KVM_FEATURE_MMU_OP 2 deprecated
KVM_FEATURE_CLOCKSOURCE2 3 kvmclock available at msrs
0x4b564d00 and 0x4b564d01
KVM_FEATURE_CLOCKSOURCE2 3 kvmclock available at msrs
0x4b564d00 and 0x4b564d01
KVM_FEATURE_ASYNC_PF 4 async pf can be enabled by
writing to msr 0x4b564d02
KVM_FEATURE_ASYNC_PF 4 async pf can be enabled by
writing to msr 0x4b564d02
KVM_FEATURE_STEAL_TIME 5 steal time can be enabled by
writing to msr 0x4b564d03
KVM_FEATURE_STEAL_TIME 5 steal time can be enabled by
writing to msr 0x4b564d03
KVM_FEATURE_PV_EOI 6 paravirtualized end of interrupt
handler can be enabled by
writing to msr 0x4b564d04
KVM_FEATURE_PV_EOI 6 paravirtualized end of interrupt
handler can be enabled by
writing to msr 0x4b564d04
KVM_FEATURE_PV_UNHAULT 7 guest checks this feature bit
before enabling paravirtualized
spinlock support
KVM_FEATURE_PV_UNHALT 7 guest checks this feature bit
before enabling paravirtualized
spinlock support
KVM_FEATURE_PV_TLB_FLUSH 9 guest checks this feature bit
before enabling paravirtualized
tlb flush
KVM_FEATURE_PV_TLB_FLUSH 9 guest checks this feature bit
before enabling paravirtualized
tlb flush
KVM_FEATURE_ASYNC_PF_VMEXIT 10 paravirtualized async PF VM EXIT
can be enabled by setting bit 2
when writing to msr 0x4b564d02
KVM_FEATURE_ASYNC_PF_VMEXIT 10 paravirtualized async PF VM EXIT
can be enabled by setting bit 2
when writing to msr 0x4b564d02
KVM_FEATURE_PV_SEND_IPI 11 guest checks this feature bit
before enabling paravirtualized
sebd IPIs
KVM_FEATURE_PV_SEND_IPI 11 guest checks this feature bit
before enabling paravirtualized
send IPIs
KVM_FEATURE_POLL_CONTROL 12 host-side polling on HLT can
be disabled by writing
to msr 0x4b564d05.
KVM_FEATURE_POLL_CONTROL 12 host-side polling on HLT can
be disabled by writing
to msr 0x4b564d05.
KVM_FEATURE_PV_SCHED_YIELD 13 guest checks this feature bit
before using paravirtualized
sched yield.
KVM_FEATURE_PV_SCHED_YIELD 13 guest checks this feature bit
before using paravirtualized
sched yield.
KVM_FEATURE_ASYNC_PF_INT 14 guest checks this feature bit
before using the second async
pf control msr 0x4b564d06 and
async pf acknowledgment msr
0x4b564d07.
KVM_FEATURE_ASYNC_PF_INT 14 guest checks this feature bit
before using the second async
pf control msr 0x4b564d06 and
async pf acknowledgment msr
0x4b564d07.
KVM_FEATURE_CLOCSOURCE_STABLE_BIT 24 host will warn if no guest-side
per-cpu warps are expeced in
kvmclock
================================= =========== ================================
KVM_FEATURE_CLOCKSOURCE_STABLE_BIT 24 host will warn if no guest-side
per-cpu warps are expected in
kvmclock
================================== =========== ================================
::

57
Documentation/virt/kvm/devices/vcpu.rst
View File

@ -25,8 +25,10 @@ Returns:
======= ========================================================
-EBUSY The PMU overflow interrupt is already set
-ENXIO The overflow interrupt not set when attempting to get it
-ENODEV PMUv3 not supported
-EFAULT Error reading interrupt number
-ENXIO PMUv3 not supported or the overflow interrupt not set
when attempting to get it
-ENODEV KVM_ARM_VCPU_PMU_V3 feature missing from VCPU
-EINVAL Invalid PMU overflow interrupt number supplied or
trying to set the IRQ number without using an in-kernel
irqchip.
@ -45,9 +47,10 @@ all vcpus, while as an SPI it must be a separate number per vcpu.
Returns:
======= ======================================================
-EEXIST Interrupt number already used
-ENODEV PMUv3 not supported or GIC not initialized
-ENXIO PMUv3 not properly configured or in-kernel irqchip not
configured as required prior to calling this attribute
-ENXIO PMUv3 not supported, missing VCPU feature or interrupt
number not set
-EBUSY PMUv3 already initialized
======= ======================================================
@ -55,6 +58,52 @@ Request the initialization of the PMUv3. If using the PMUv3 with an in-kernel
virtual GIC implementation, this must be done after initializing the in-kernel
irqchip.
1.3 ATTRIBUTE: KVM_ARM_VCPU_PMU_V3_FILTER
-----------------------------------------
:Parameters: in kvm_device_attr.addr the address for a PMU event filter is a
pointer to a struct kvm_pmu_event_filter
:Returns:
======= ======================================================
-ENODEV PMUv3 not supported or GIC not initialized
-ENXIO PMUv3 not properly configured or in-kernel irqchip not
configured as required prior to calling this attribute
-EBUSY PMUv3 already initialized
-EINVAL Invalid filter range
======= ======================================================
Request the installation of a PMU event filter described as follows::
struct kvm_pmu_event_filter {
__u16 base_event;
__u16 nevents;
#define KVM_PMU_EVENT_ALLOW 0
#define KVM_PMU_EVENT_DENY 1
__u8 action;
__u8 pad[3];
};
A filter range is defined as the range [@base_event, @base_event + @nevents),
together with an @action (KVM_PMU_EVENT_ALLOW or KVM_PMU_EVENT_DENY). The
first registered range defines the global policy (global ALLOW if the first
@action is DENY, global DENY if the first @action is ALLOW). Multiple ranges
can be programmed, and must fit within the event space defined by the PMU
architecture (10 bits on ARMv8.0, 16 bits from ARMv8.1 onwards).
Note: "Cancelling" a filter by registering the opposite action for the same
range doesn't change the default action. For example, installing an ALLOW
filter for event range [0:10) as the first filter and then applying a DENY
action for the same range will leave the whole range as disabled.
Restrictions: Event 0 (SW_INCR) is never filtered, as it doesn't count a
hardware event. Filtering event 0x1E (CHAIN) has no effect either, as it
isn't strictly speaking an event. Filtering the cycle counter is possible
using event 0x11 (CPU_CYCLES).
2. GROUP: KVM_ARM_VCPU_TIMER_CTRL
=================================

29
arch/arm64/include/asm/assembler.h
View File

@ -218,6 +218,23 @@ lr .req x30 // link register
str \src, [\tmp, :lo12:\sym]
.endm
/*
* @dst: destination register
*/
#if defined(__KVM_NVHE_HYPERVISOR__) || defined(__KVM_VHE_HYPERVISOR__)
.macro this_cpu_offset, dst
mrs \dst, tpidr_el2
.endm
#else
.macro this_cpu_offset, dst
alternative_if_not ARM64_HAS_VIRT_HOST_EXTN
mrs \dst, tpidr_el1
alternative_else
mrs \dst, tpidr_el2
alternative_endif
.endm
#endif
/*
* @dst: Result of per_cpu(sym, smp_processor_id()) (can be SP)
* @sym: The name of the per-cpu variable
@ -226,11 +243,7 @@ lr .req x30 // link register
.macro adr_this_cpu, dst, sym, tmp
adrp \tmp, \sym
add \dst, \tmp, #:lo12:\sym
alternative_if_not ARM64_HAS_VIRT_HOST_EXTN
mrs \tmp, tpidr_el1
alternative_else
mrs \tmp, tpidr_el2
alternative_endif
this_cpu_offset \tmp
add \dst, \dst, \tmp
.endm
@ -241,11 +254,7 @@ alternative_endif
*/
.macro ldr_this_cpu dst, sym, tmp
adr_l \dst, \sym
alternative_if_not ARM64_HAS_VIRT_HOST_EXTN
mrs \tmp, tpidr_el1
alternative_else
mrs \tmp, tpidr_el2
alternative_endif
this_cpu_offset \tmp
ldr \dst, [\dst, \tmp]
.endm

36
arch/arm64/include/asm/hyp_image.h Normal file
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@ -0,0 +1,36 @@
/* SPDX-License-Identifier: GPL-2.0 */
/*
* Copyright (C) 2020 Google LLC.
* Written by David Brazdil <dbrazdil@google.com>
*/
#ifndef __ARM64_HYP_IMAGE_H__
#define __ARM64_HYP_IMAGE_H__
/*
* KVM nVHE code has its own symbol namespace prefixed with __kvm_nvhe_,
* to separate it from the kernel proper.
*/
#define kvm_nvhe_sym(sym) __kvm_nvhe_##sym
#ifdef LINKER_SCRIPT
/*
* KVM nVHE ELF section names are prefixed with .hyp, to separate them
* from the kernel proper.
*/
#define HYP_SECTION_NAME(NAME) .hyp##NAME
/* Defines an ELF hyp section from input section @NAME and its subsections. */
#define HYP_SECTION(NAME) \
HYP_SECTION_NAME(NAME) : { *(NAME NAME##.*) }
/*
* Defines a linker script alias of a kernel-proper symbol referenced by
* KVM nVHE hyp code.
*/
#define KVM_NVHE_ALIAS(sym) kvm_nvhe_sym(sym) = sym;
#endif /* LINKER_SCRIPT */
#endif /* __ARM64_HYP_IMAGE_H__ */

189
arch/arm64/include/asm/kvm_asm.h
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@ -7,6 +7,7 @@
#ifndef __ARM_KVM_ASM_H__
#define __ARM_KVM_ASM_H__
#include <asm/hyp_image.h>
#include <asm/virt.h>
#define ARM_EXIT_WITH_SERROR_BIT 31
@ -35,17 +36,34 @@
#define __SMCCC_WORKAROUND_1_SMC_SZ 36
#define KVM_HOST_SMCCC_ID(id) \
ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \
ARM_SMCCC_SMC_64, \
ARM_SMCCC_OWNER_VENDOR_HYP, \
(id))
#define KVM_HOST_SMCCC_FUNC(name) KVM_HOST_SMCCC_ID(__KVM_HOST_SMCCC_FUNC_##name)
#define __KVM_HOST_SMCCC_FUNC___kvm_hyp_init 0
#define __KVM_HOST_SMCCC_FUNC___kvm_vcpu_run 1
#define __KVM_HOST_SMCCC_FUNC___kvm_flush_vm_context 2
#define __KVM_HOST_SMCCC_FUNC___kvm_tlb_flush_vmid_ipa 3
#define __KVM_HOST_SMCCC_FUNC___kvm_tlb_flush_vmid 4
#define __KVM_HOST_SMCCC_FUNC___kvm_tlb_flush_local_vmid 5
#define __KVM_HOST_SMCCC_FUNC___kvm_timer_set_cntvoff 6
#define __KVM_HOST_SMCCC_FUNC___kvm_enable_ssbs 7
#define __KVM_HOST_SMCCC_FUNC___vgic_v3_get_ich_vtr_el2 8
#define __KVM_HOST_SMCCC_FUNC___vgic_v3_read_vmcr 9
#define __KVM_HOST_SMCCC_FUNC___vgic_v3_write_vmcr 10
#define __KVM_HOST_SMCCC_FUNC___vgic_v3_init_lrs 11
#define __KVM_HOST_SMCCC_FUNC___kvm_get_mdcr_el2 12
#define __KVM_HOST_SMCCC_FUNC___vgic_v3_save_aprs 13
#define __KVM_HOST_SMCCC_FUNC___vgic_v3_restore_aprs 14
#ifndef __ASSEMBLY__
#include <linux/mm.h>
/*
* Translate name of a symbol defined in nVHE hyp to the name seen
* by kernel proper. All nVHE symbols are prefixed by the build system
* to avoid clashes with the VHE variants.
*/
#define kvm_nvhe_sym(sym) __kvm_nvhe_##sym
#define DECLARE_KVM_VHE_SYM(sym) extern char sym[]
#define DECLARE_KVM_NVHE_SYM(sym) extern char kvm_nvhe_sym(sym)[]
@ -57,10 +75,53 @@
DECLARE_KVM_VHE_SYM(sym); \
DECLARE_KVM_NVHE_SYM(sym)
#define CHOOSE_VHE_SYM(sym) sym
#define CHOOSE_NVHE_SYM(sym) kvm_nvhe_sym(sym)
#define DECLARE_KVM_VHE_PER_CPU(type, sym) \
DECLARE_PER_CPU(type, sym)
#define DECLARE_KVM_NVHE_PER_CPU(type, sym) \
DECLARE_PER_CPU(type, kvm_nvhe_sym(sym))
#define DECLARE_KVM_HYP_PER_CPU(type, sym) \
DECLARE_KVM_VHE_PER_CPU(type, sym); \
DECLARE_KVM_NVHE_PER_CPU(type, sym)
/*
* Compute pointer to a symbol defined in nVHE percpu region.
* Returns NULL if percpu memory has not been allocated yet.
*/
#define this_cpu_ptr_nvhe_sym(sym) per_cpu_ptr_nvhe_sym(sym, smp_processor_id())
#define per_cpu_ptr_nvhe_sym(sym, cpu) \
({ \
unsigned long base, off; \
base = kvm_arm_hyp_percpu_base[cpu]; \
off = (unsigned long)&CHOOSE_NVHE_SYM(sym) - \
(unsigned long)&CHOOSE_NVHE_SYM(__per_cpu_start); \
base ? (typeof(CHOOSE_NVHE_SYM(sym))*)(base + off) : NULL; \
})
#if defined(__KVM_NVHE_HYPERVISOR__)
#define CHOOSE_NVHE_SYM(sym) sym
#define CHOOSE_HYP_SYM(sym) CHOOSE_NVHE_SYM(sym)
/* The nVHE hypervisor shouldn't even try to access VHE symbols */
extern void *__nvhe_undefined_symbol;
#define CHOOSE_VHE_SYM(sym) __nvhe_undefined_symbol
#define this_cpu_ptr_hyp_sym(sym) (&__nvhe_undefined_symbol)
#define per_cpu_ptr_hyp_sym(sym, cpu) (&__nvhe_undefined_symbol)
#elif defined(__KVM_VHE_HYPERVISOR__)
#define CHOOSE_VHE_SYM(sym) sym
#define CHOOSE_HYP_SYM(sym) CHOOSE_VHE_SYM(sym)
/* The VHE hypervisor shouldn't even try to access nVHE symbols */
extern void *__vhe_undefined_symbol;
#define CHOOSE_NVHE_SYM(sym) __vhe_undefined_symbol
#define this_cpu_ptr_hyp_sym(sym) (&__vhe_undefined_symbol)
#define per_cpu_ptr_hyp_sym(sym, cpu) (&__vhe_undefined_symbol)
#else
#ifndef __KVM_NVHE_HYPERVISOR__
/*
* BIG FAT WARNINGS:
*
@ -72,12 +133,21 @@
* - Don't let the nVHE hypervisor have access to this, as it will
* pick the *wrong* symbol (yes, it runs at EL2...).
*/
#define CHOOSE_HYP_SYM(sym) (is_kernel_in_hyp_mode() ? CHOOSE_VHE_SYM(sym) \
#define CHOOSE_HYP_SYM(sym) (is_kernel_in_hyp_mode() \
? CHOOSE_VHE_SYM(sym) \
: CHOOSE_NVHE_SYM(sym))
#else
/* The nVHE hypervisor shouldn't even try to access anything */
extern void *__nvhe_undefined_symbol;
#define CHOOSE_HYP_SYM(sym) __nvhe_undefined_symbol
#define this_cpu_ptr_hyp_sym(sym) (is_kernel_in_hyp_mode() \
? this_cpu_ptr(&sym) \
: this_cpu_ptr_nvhe_sym(sym))
#define per_cpu_ptr_hyp_sym(sym, cpu) (is_kernel_in_hyp_mode() \
? per_cpu_ptr(&sym, cpu) \
: per_cpu_ptr_nvhe_sym(sym, cpu))
#define CHOOSE_VHE_SYM(sym) sym
#define CHOOSE_NVHE_SYM(sym) kvm_nvhe_sym(sym)
#endif
/* Translate a kernel address @ptr into its equivalent linear mapping */
@ -95,10 +165,16 @@ struct kvm_vcpu;
struct kvm_s2_mmu;
DECLARE_KVM_NVHE_SYM(__kvm_hyp_init);
DECLARE_KVM_NVHE_SYM(__kvm_hyp_host_vector);
DECLARE_KVM_HYP_SYM(__kvm_hyp_vector);
#define __kvm_hyp_init CHOOSE_NVHE_SYM(__kvm_hyp_init)
#define __kvm_hyp_host_vector CHOOSE_NVHE_SYM(__kvm_hyp_host_vector)
#define __kvm_hyp_vector CHOOSE_HYP_SYM(__kvm_hyp_vector)
extern unsigned long kvm_arm_hyp_percpu_base[NR_CPUS];
DECLARE_KVM_NVHE_SYM(__per_cpu_start);
DECLARE_KVM_NVHE_SYM(__per_cpu_end);
extern atomic_t arm64_el2_vector_last_slot;
DECLARE_KVM_HYP_SYM(__bp_harden_hyp_vecs);
#define __bp_harden_hyp_vecs CHOOSE_HYP_SYM(__bp_harden_hyp_vecs)
@ -144,26 +220,6 @@ extern char __smccc_workaround_1_smc[__SMCCC_WORKAROUND_1_SMC_SZ];
addr; \
})
/*
* Home-grown __this_cpu_{ptr,read} variants that always work at HYP,
* provided that sym is really a *symbol* and not a pointer obtained from
* a data structure. As for SHIFT_PERCPU_PTR(), the creative casting keeps
* sparse quiet.
*/
#define __hyp_this_cpu_ptr(sym) \
({ \
void *__ptr; \
__verify_pcpu_ptr(&sym); \
__ptr = hyp_symbol_addr(sym); \
__ptr += read_sysreg(tpidr_el2); \
(typeof(sym) __kernel __force *)__ptr; \
})
#define __hyp_this_cpu_read(sym) \
({ \
*__hyp_this_cpu_ptr(sym); \
})
#define __KVM_EXTABLE(from, to) \
" .pushsection __kvm_ex_table, \"a\"\n" \
" .align 3\n" \
@ -194,20 +250,8 @@ extern char __smccc_workaround_1_smc[__SMCCC_WORKAROUND_1_SMC_SZ];
#else /* __ASSEMBLY__ */
.macro hyp_adr_this_cpu reg, sym, tmp
adr_l \reg, \sym
mrs \tmp, tpidr_el2
add \reg, \reg, \tmp
.endm
.macro hyp_ldr_this_cpu reg, sym, tmp
adr_l \reg, \sym
mrs \tmp, tpidr_el2
ldr \reg, [\reg, \tmp]
.endm
.macro get_host_ctxt reg, tmp
hyp_adr_this_cpu \reg, kvm_host_data, \tmp
adr_this_cpu \reg, kvm_host_data, \tmp
add \reg, \reg, #HOST_DATA_CONTEXT
.endm
@ -216,6 +260,16 @@ extern char __smccc_workaround_1_smc[__SMCCC_WORKAROUND_1_SMC_SZ];
ldr \vcpu, [\ctxt, #HOST_CONTEXT_VCPU]
.endm
.macro get_loaded_vcpu vcpu, ctxt
adr_this_cpu \ctxt, kvm_hyp_ctxt, \vcpu
ldr \vcpu, [\ctxt, #HOST_CONTEXT_VCPU]
.endm
.macro set_loaded_vcpu vcpu, ctxt, tmp
adr_this_cpu \ctxt, kvm_hyp_ctxt, \tmp
str \vcpu, [\ctxt, #HOST_CONTEXT_VCPU]
.endm
/*
* KVM extable for unexpected exceptions.
* In the same format _asm_extable, but output to a different section so that
@ -231,6 +285,45 @@ extern char __smccc_workaround_1_smc[__SMCCC_WORKAROUND_1_SMC_SZ];
.popsection
.endm
#define CPU_XREG_OFFSET(x) (CPU_USER_PT_REGS + 8*x)
#define CPU_LR_OFFSET CPU_XREG_OFFSET(30)
#define CPU_SP_EL0_OFFSET (CPU_LR_OFFSET + 8)
/*
* We treat x18 as callee-saved as the host may use it as a platform
* register (e.g. for shadow call stack).
*/
.macro save_callee_saved_regs ctxt
str x18, [\ctxt, #CPU_XREG_OFFSET(18)]
stp x19, x20, [\ctxt, #CPU_XREG_OFFSET(19)]
stp x21, x22, [\ctxt, #CPU_XREG_OFFSET(21)]
stp x23, x24, [\ctxt, #CPU_XREG_OFFSET(23)]
stp x25, x26, [\ctxt, #CPU_XREG_OFFSET(25)]
stp x27, x28, [\ctxt, #CPU_XREG_OFFSET(27)]
stp x29, lr, [\ctxt, #CPU_XREG_OFFSET(29)]
.endm
.macro restore_callee_saved_regs ctxt
// We require \ctxt is not x18-x28
ldr x18, [\ctxt, #CPU_XREG_OFFSET(18)]
ldp x19, x20, [\ctxt, #CPU_XREG_OFFSET(19)]
ldp x21, x22, [\ctxt, #CPU_XREG_OFFSET(21)]
ldp x23, x24, [\ctxt, #CPU_XREG_OFFSET(23)]
ldp x25, x26, [\ctxt, #CPU_XREG_OFFSET(25)]
ldp x27, x28, [\ctxt, #CPU_XREG_OFFSET(27)]
ldp x29, lr, [\ctxt, #CPU_XREG_OFFSET(29)]
.endm
.macro save_sp_el0 ctxt, tmp
mrs \tmp, sp_el0
str \tmp, [\ctxt, #CPU_SP_EL0_OFFSET]
.endm
.macro restore_sp_el0 ctxt, tmp
ldr \tmp, [\ctxt, #CPU_SP_EL0_OFFSET]
msr sp_el0, \tmp
.endm
#endif
#endif /* __ARM_KVM_ASM_H__ */

35
arch/arm64/include/asm/kvm_host.h
View File

@ -11,6 +11,7 @@
#ifndef __ARM64_KVM_HOST_H__
#define __ARM64_KVM_HOST_H__
#include <linux/arm-smccc.h>
#include <linux/bitmap.h>
#include <linux/types.h>
#include <linux/jump_label.h>
@ -79,8 +80,8 @@ struct kvm_s2_mmu {
* for vEL1/EL0 with vHCR_EL2.VM == 0. In that case, we use the
* canonical stage-2 page tables.
*/
pgd_t *pgd;
phys_addr_t pgd_phys;
struct kvm_pgtable *pgt;
/* The last vcpu id that ran on each physical CPU */
int __percpu *last_vcpu_ran;
@ -110,6 +111,13 @@ struct kvm_arch {
* supported.
*/
bool return_nisv_io_abort_to_user;
/*
* VM-wide PMU filter, implemented as a bitmap and big enough for
* up to 2^10 events (ARMv8.0) or 2^16 events (ARMv8.1+).
*/
unsigned long *pmu_filter;
unsigned int pmuver;
};
struct kvm_vcpu_fault_info {
@ -262,8 +270,6 @@ struct kvm_host_data {
struct kvm_pmu_events pmu_events;
};
typedef struct kvm_host_data kvm_host_data_t;
struct vcpu_reset_state {
unsigned long pc;
unsigned long r0;
@ -480,18 +486,15 @@ int kvm_test_age_hva(struct kvm *kvm, unsigned long hva);
void kvm_arm_halt_guest(struct kvm *kvm);
void kvm_arm_resume_guest(struct kvm *kvm);
u64 __kvm_call_hyp(void *hypfn, ...);
#define kvm_call_hyp_nvhe(f, ...) \
do { \
DECLARE_KVM_NVHE_SYM(f); \
__kvm_call_hyp(kvm_ksym_ref_nvhe(f), ##__VA_ARGS__); \
} while(0)
#define kvm_call_hyp_nvhe_ret(f, ...) \
#define kvm_call_hyp_nvhe(f, ...) \
({ \
DECLARE_KVM_NVHE_SYM(f); \
__kvm_call_hyp(kvm_ksym_ref_nvhe(f), ##__VA_ARGS__); \
struct arm_smccc_res res; \
\
arm_smccc_1_1_hvc(KVM_HOST_SMCCC_FUNC(f), \
##__VA_ARGS__, &res); \
WARN_ON(res.a0 != SMCCC_RET_SUCCESS); \
\
res.a1; \
})
/*
@ -517,7 +520,7 @@ u64 __kvm_call_hyp(void *hypfn, ...);
ret = f(__VA_ARGS__); \
isb(); \
} else { \
ret = kvm_call_hyp_nvhe_ret(f, ##__VA_ARGS__); \
ret = kvm_call_hyp_nvhe(f, ##__VA_ARGS__); \
} \
\
ret; \
@ -565,7 +568,7 @@ void kvm_set_sei_esr(struct kvm_vcpu *vcpu, u64 syndrome);
struct kvm_vcpu *kvm_mpidr_to_vcpu(struct kvm *kvm, unsigned long mpidr);
DECLARE_PER_CPU(kvm_host_data_t, kvm_host_data);
DECLARE_KVM_HYP_PER_CPU(struct kvm_host_data, kvm_host_data);
static inline void kvm_init_host_cpu_context(struct kvm_cpu_context *cpu_ctxt)
{

9
arch/arm64/include/asm/kvm_hyp.h
View File

@ -12,6 +12,9 @@
#include <asm/alternative.h>
#include <asm/sysreg.h>
DECLARE_PER_CPU(struct kvm_cpu_context, kvm_hyp_ctxt);
DECLARE_PER_CPU(unsigned long, kvm_hyp_vector);
#define read_sysreg_elx(r,nvh,vh) \
({ \
u64 reg; \
@ -87,11 +90,11 @@ void activate_traps_vhe_load(struct kvm_vcpu *vcpu);
void deactivate_traps_vhe_put(void);
#endif
u64 __guest_enter(struct kvm_vcpu *vcpu, struct kvm_cpu_context *host_ctxt);
u64 __guest_enter(struct kvm_vcpu *vcpu);
void __noreturn hyp_panic(struct kvm_cpu_context *host_ctxt);
void __noreturn hyp_panic(void);
#ifdef __KVM_NVHE_HYPERVISOR__
void __noreturn __hyp_do_panic(unsigned long, ...);
void __noreturn __hyp_do_panic(bool restore_host, u64 spsr, u64 elr, u64 par);
#endif
#endif /* __ARM64_KVM_HYP_H__ */

251
arch/arm64/include/asm/kvm_mmu.h
View File

@ -44,16 +44,6 @@
* HYP_VA_MIN = 1 << (VA_BITS - 1)
* HYP_VA_MAX = HYP_VA_MIN + (1 << (VA_BITS - 1)) - 1
*
* This of course assumes that the trampoline page exists within the
* VA_BITS range. If it doesn't, then it means we're in the odd case
* where the kernel idmap (as well as HYP) uses more levels than the
* kernel runtime page tables (as seen when the kernel is configured
* for 4k pages, 39bits VA, and yet memory lives just above that
* limit, forcing the idmap to use 4 levels of page tables while the
* kernel itself only uses 3). In this particular case, it doesn't
* matter which side of VA_BITS we use, as we're guaranteed not to
* conflict with anything.
*
* When using VHE, there are no separate hyp mappings and all KVM
* functionality is already mapped as part of the main kernel
* mappings, and none of this applies in that case.
@ -118,15 +108,10 @@ static __always_inline unsigned long __kern_hyp_va(unsigned long v)
#define kvm_phys_size(kvm) (_AC(1, ULL) << kvm_phys_shift(kvm))
#define kvm_phys_mask(kvm) (kvm_phys_size(kvm) - _AC(1, ULL))
static inline bool kvm_page_empty(void *ptr)
{
struct page *ptr_page = virt_to_page(ptr);
return page_count(ptr_page) == 1;
}
#include <asm/kvm_pgtable.h>
#include <asm/stage2_pgtable.h>
int create_hyp_mappings(void *from, void *to, pgprot_t prot);
int create_hyp_mappings(void *from, void *to, enum kvm_pgtable_prot prot);
int create_hyp_io_mappings(phys_addr_t phys_addr, size_t size,
void __iomem **kaddr,
void __iomem **haddr);
@ -142,149 +127,9 @@ int kvm_phys_addr_ioremap(struct kvm *kvm, phys_addr_t guest_ipa,
int kvm_handle_guest_abort(struct kvm_vcpu *vcpu);
void kvm_mmu_free_memory_caches(struct kvm_vcpu *vcpu);
phys_addr_t kvm_mmu_get_httbr(void);
phys_addr_t kvm_get_idmap_vector(void);
int kvm_mmu_init(void);
void kvm_clear_hyp_idmap(void);
#define kvm_mk_pmd(ptep) \
__pmd(__phys_to_pmd_val(__pa(ptep)) | PMD_TYPE_TABLE)
#define kvm_mk_pud(pmdp) \
__pud(__phys_to_pud_val(__pa(pmdp)) | PMD_TYPE_TABLE)
#define kvm_mk_p4d(pmdp) \
__p4d(__phys_to_p4d_val(__pa(pmdp)) | PUD_TYPE_TABLE)
#define kvm_set_pud(pudp, pud) set_pud(pudp, pud)
#define kvm_pfn_pte(pfn, prot) pfn_pte(pfn, prot)
#define kvm_pfn_pmd(pfn, prot) pfn_pmd(pfn, prot)
#define kvm_pfn_pud(pfn, prot) pfn_pud(pfn, prot)
#define kvm_pud_pfn(pud) pud_pfn(pud)
#define kvm_pmd_mkhuge(pmd) pmd_mkhuge(pmd)
#define kvm_pud_mkhuge(pud) pud_mkhuge(pud)
static inline pte_t kvm_s2pte_mkwrite(pte_t pte)
{
pte_val(pte) |= PTE_S2_RDWR;
return pte;
}
static inline pmd_t kvm_s2pmd_mkwrite(pmd_t pmd)
{
pmd_val(pmd) |= PMD_S2_RDWR;
return pmd;
}
static inline pud_t kvm_s2pud_mkwrite(pud_t pud)
{
pud_val(pud) |= PUD_S2_RDWR;
return pud;
}
static inline pte_t kvm_s2pte_mkexec(pte_t pte)
{
pte_val(pte) &= ~PTE_S2_XN;
return pte;
}
static inline pmd_t kvm_s2pmd_mkexec(pmd_t pmd)
{
pmd_val(pmd) &= ~PMD_S2_XN;
return pmd;
}
static inline pud_t kvm_s2pud_mkexec(pud_t pud)
{
pud_val(pud) &= ~PUD_S2_XN;
return pud;
}
static inline void kvm_set_s2pte_readonly(pte_t *ptep)
{
pteval_t old_pteval, pteval;
pteval = READ_ONCE(pte_val(*ptep));
do {
old_pteval = pteval;
pteval &= ~PTE_S2_RDWR;
pteval |= PTE_S2_RDONLY;
pteval = cmpxchg_relaxed(&pte_val(*ptep), old_pteval, pteval);
} while (pteval != old_pteval);
}
static inline bool kvm_s2pte_readonly(pte_t *ptep)
{
return (READ_ONCE(pte_val(*ptep)) & PTE_S2_RDWR) == PTE_S2_RDONLY;
}
static inline bool kvm_s2pte_exec(pte_t *ptep)
{
return !(READ_ONCE(pte_val(*ptep)) & PTE_S2_XN);
}
static inline void kvm_set_s2pmd_readonly(pmd_t *pmdp)
{
kvm_set_s2pte_readonly((pte_t *)pmdp);
}
static inline bool kvm_s2pmd_readonly(pmd_t *pmdp)
{
return kvm_s2pte_readonly((pte_t *)pmdp);
}
static inline bool kvm_s2pmd_exec(pmd_t *pmdp)
{
return !(READ_ONCE(pmd_val(*pmdp)) & PMD_S2_XN);
}
static inline void kvm_set_s2pud_readonly(pud_t *pudp)
{
kvm_set_s2pte_readonly((pte_t *)pudp);
}
static inline bool kvm_s2pud_readonly(pud_t *pudp)
{
return kvm_s2pte_readonly((pte_t *)pudp);
}
static inline bool kvm_s2pud_exec(pud_t *pudp)
{
return !(READ_ONCE(pud_val(*pudp)) & PUD_S2_XN);
}
static inline pud_t kvm_s2pud_mkyoung(pud_t pud)
{
return pud_mkyoung(pud);
}
static inline bool kvm_s2pud_young(pud_t pud)
{
return pud_young(pud);
}
#define hyp_pte_table_empty(ptep) kvm_page_empty(ptep)
#ifdef __PAGETABLE_PMD_FOLDED
#define hyp_pmd_table_empty(pmdp) (0)
#else
#define hyp_pmd_table_empty(pmdp) kvm_page_empty(pmdp)
#endif
#ifdef __PAGETABLE_PUD_FOLDED
#define hyp_pud_table_empty(pudp) (0)
#else
#define hyp_pud_table_empty(pudp) kvm_page_empty(pudp)
#endif
#ifdef __PAGETABLE_P4D_FOLDED
#define hyp_p4d_table_empty(p4dp) (0)
#else
#define hyp_p4d_table_empty(p4dp) kvm_page_empty(p4dp)
#endif
struct kvm;
@ -326,77 +171,9 @@ static inline void __invalidate_icache_guest_page(kvm_pfn_t pfn,
}
}
static inline void __kvm_flush_dcache_pte(pte_t pte)
{
if (!cpus_have_const_cap(ARM64_HAS_STAGE2_FWB)) {
struct page *page = pte_page(pte);
kvm_flush_dcache_to_poc(page_address(page), PAGE_SIZE);
}
}
static inline void __kvm_flush_dcache_pmd(pmd_t pmd)
{
if (!cpus_have_const_cap(ARM64_HAS_STAGE2_FWB)) {
struct page *page = pmd_page(pmd);
kvm_flush_dcache_to_poc(page_address(page), PMD_SIZE);
}
}
static inline void __kvm_flush_dcache_pud(pud_t pud)
{
if (!cpus_have_const_cap(ARM64_HAS_STAGE2_FWB)) {
struct page *page = pud_page(pud);
kvm_flush_dcache_to_poc(page_address(page), PUD_SIZE);
}
}
void kvm_set_way_flush(struct kvm_vcpu *vcpu);
void kvm_toggle_cache(struct kvm_vcpu *vcpu, bool was_enabled);
static inline bool __kvm_cpu_uses_extended_idmap(void)
{
return __cpu_uses_extended_idmap_level();
}
static inline unsigned long __kvm_idmap_ptrs_per_pgd(void)
{
return idmap_ptrs_per_pgd;
}
/*
* Can't use pgd_populate here, because the extended idmap adds an extra level
* above CONFIG_PGTABLE_LEVELS (which is 2 or 3 if we're using the extended
* idmap), and pgd_populate is only available if CONFIG_PGTABLE_LEVELS = 4.
*/
static inline void __kvm_extend_hypmap(pgd_t *boot_hyp_pgd,
pgd_t *hyp_pgd,
pgd_t *merged_hyp_pgd,
unsigned long hyp_idmap_start)
{
int idmap_idx;
u64 pgd_addr;
/*
* Use the first entry to access the HYP mappings. It is
* guaranteed to be free, otherwise we wouldn't use an
* extended idmap.
*/
VM_BUG_ON(pgd_val(merged_hyp_pgd[0]));
pgd_addr = __phys_to_pgd_val(__pa(hyp_pgd));
merged_hyp_pgd[0] = __pgd(pgd_addr | PMD_TYPE_TABLE);
/*
* Create another extended level entry that points to the boot HYP map,
* which contains an ID mapping of the HYP init code. We essentially
* merge the boot and runtime HYP maps by doing so, but they don't
* overlap anyway, so this is fine.
*/
idmap_idx = hyp_idmap_start >> VA_BITS;
VM_BUG_ON(pgd_val(merged_hyp_pgd[idmap_idx]));
pgd_addr = __phys_to_pgd_val(__pa(boot_hyp_pgd));
merged_hyp_pgd[idmap_idx] = __pgd(pgd_addr | PMD_TYPE_TABLE);
}
static inline unsigned int kvm_get_vmid_bits(void)
{
int reg = read_sanitised_ftr_reg(SYS_ID_AA64MMFR1_EL1);
@ -479,30 +256,6 @@ static inline void *kvm_get_hyp_vector(void)
#define kvm_phys_to_vttbr(addr) phys_to_ttbr(addr)
/*
* Get the magic number 'x' for VTTBR:BADDR of this KVM instance.
* With v8.2 LVA extensions, 'x' should be a minimum of 6 with
* 52bit IPS.
*/
static inline int arm64_vttbr_x(u32 ipa_shift, u32 levels)
{
int x = ARM64_VTTBR_X(ipa_shift, levels);
return (IS_ENABLED(CONFIG_ARM64_PA_BITS_52) && x < 6) ? 6 : x;
}
static inline u64 vttbr_baddr_mask(u32 ipa_shift, u32 levels)
{
unsigned int x = arm64_vttbr_x(ipa_shift, levels);
return GENMASK_ULL(PHYS_MASK_SHIFT - 1, x);
}
static inline u64 kvm_vttbr_baddr_mask(struct kvm *kvm)
{
return vttbr_baddr_mask(kvm_phys_shift(kvm), kvm_stage2_levels(kvm));
}
static __always_inline u64 kvm_get_vttbr(struct kvm_s2_mmu *mmu)
{
struct kvm_vmid *vmid = &mmu->vmid;

309
arch/arm64/include/asm/kvm_pgtable.h Normal file
View File

@ -0,0 +1,309 @@
// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (C) 2020 Google LLC
* Author: Will Deacon <will@kernel.org>
*/
#ifndef __ARM64_KVM_PGTABLE_H__
#define __ARM64_KVM_PGTABLE_H__
#include <linux/bits.h>
#include <linux/kvm_host.h>
#include <linux/types.h>
typedef u64 kvm_pte_t;
/**
* struct kvm_pgtable - KVM page-table.
* @ia_bits: Maximum input address size, in bits.
* @start_level: Level at which the page-table walk starts.
* @pgd: Pointer to the first top-level entry of the page-table.
* @mmu: Stage-2 KVM MMU struct. Unused for stage-1 page-tables.
*/
struct kvm_pgtable {
u32 ia_bits;
u32 start_level;
kvm_pte_t *pgd;
/* Stage-2 only */
struct kvm_s2_mmu *mmu;
};
/**
* enum kvm_pgtable_prot - Page-table permissions and attributes.
* @KVM_PGTABLE_PROT_X: Execute permission.
* @KVM_PGTABLE_PROT_W: Write permission.
* @KVM_PGTABLE_PROT_R: Read permission.
* @KVM_PGTABLE_PROT_DEVICE: Device attributes.
*/
enum kvm_pgtable_prot {
KVM_PGTABLE_PROT_X = BIT(0),
KVM_PGTABLE_PROT_W = BIT(1),
KVM_PGTABLE_PROT_R = BIT(2),
KVM_PGTABLE_PROT_DEVICE = BIT(3),
};
#define PAGE_HYP (KVM_PGTABLE_PROT_R | KVM_PGTABLE_PROT_W)
#define PAGE_HYP_EXEC (KVM_PGTABLE_PROT_R | KVM_PGTABLE_PROT_X)
#define PAGE_HYP_RO (KVM_PGTABLE_PROT_R)
#define PAGE_HYP_DEVICE (PAGE_HYP | KVM_PGTABLE_PROT_DEVICE)
/**
* enum kvm_pgtable_walk_flags - Flags to control a depth-first page-table walk.
* @KVM_PGTABLE_WALK_LEAF: Visit leaf entries, including invalid
* entries.
* @KVM_PGTABLE_WALK_TABLE_PRE: Visit table entries before their
* children.
* @KVM_PGTABLE_WALK_TABLE_POST: Visit table entries after their
* children.
*/
enum kvm_pgtable_walk_flags {
KVM_PGTABLE_WALK_LEAF = BIT(0),
KVM_PGTABLE_WALK_TABLE_PRE = BIT(1),
KVM_PGTABLE_WALK_TABLE_POST = BIT(2),
};
typedef int (*kvm_pgtable_visitor_fn_t)(u64 addr, u64 end, u32 level,
kvm_pte_t *ptep,
enum kvm_pgtable_walk_flags flag,
void * const arg);
/**
* struct kvm_pgtable_walker - Hook into a page-table walk.
* @cb: Callback function to invoke during the walk.
* @arg: Argument passed to the callback function.
* @flags: Bitwise-OR of flags to identify the entry types on which to
* invoke the callback function.
*/
struct kvm_pgtable_walker {
const kvm_pgtable_visitor_fn_t cb;
void * const arg;
const enum kvm_pgtable_walk_flags flags;
};
/**
* kvm_pgtable_hyp_init() - Initialise a hypervisor stage-1 page-table.
* @pgt: Uninitialised page-table structure to initialise.
* @va_bits: Maximum virtual address bits.
*
* Return: 0 on success, negative error code on failure.
*/
int kvm_pgtable_hyp_init(struct kvm_pgtable *pgt, u32 va_bits);
/**
* kvm_pgtable_hyp_destroy() - Destroy an unused hypervisor stage-1 page-table.
* @pgt: Page-table structure initialised by kvm_pgtable_hyp_init().
*
* The page-table is assumed to be unreachable by any hardware walkers prior
* to freeing and therefore no TLB invalidation is performed.
*/
void kvm_pgtable_hyp_destroy(struct kvm_pgtable *pgt);
/**
* kvm_pgtable_hyp_map() - Install a mapping in a hypervisor stage-1 page-table.
* @pgt: Page-table structure initialised by kvm_pgtable_hyp_init().
* @addr: Virtual address at which to place the mapping.
* @size: Size of the mapping.
* @phys: Physical address of the memory to map.
* @prot: Permissions and attributes for the mapping.
*
* The offset of @addr within a page is ignored, @size is rounded-up to
* the next page boundary and @phys is rounded-down to the previous page
* boundary.
*
* If device attributes are not explicitly requested in @prot, then the
* mapping will be normal, cacheable. Attempts to install a new mapping
* for a virtual address that is already mapped will be rejected with an
* error and a WARN().
*
* Return: 0 on success, negative error code on failure.
*/
int kvm_pgtable_hyp_map(struct kvm_pgtable *pgt, u64 addr, u64 size, u64 phys,
enum kvm_pgtable_prot prot);
/**
* kvm_pgtable_stage2_init() - Initialise a guest stage-2 page-table.
* @pgt: Uninitialised page-table structure to initialise.
* @kvm: KVM structure representing the guest virtual machine.
*
* Return: 0 on success, negative error code on failure.
*/
int kvm_pgtable_stage2_init(struct kvm_pgtable *pgt, struct kvm *kvm);
/**
* kvm_pgtable_stage2_destroy() - Destroy an unused guest stage-2 page-table.
* @pgt: Page-table structure initialised by kvm_pgtable_stage2_init().
*
* The page-table is assumed to be unreachable by any hardware walkers prior
* to freeing and therefore no TLB invalidation is performed.
*/
void kvm_pgtable_stage2_destroy(struct kvm_pgtable *pgt);
/**
* kvm_pgtable_stage2_map() - Install a mapping in a guest stage-2 page-table.
* @pgt: Page-table structure initialised by kvm_pgtable_stage2_init().
* @addr: Intermediate physical address at which to place the mapping.
* @size: Size of the mapping.
* @phys: Physical address of the memory to map.
* @prot: Permissions and attributes for the mapping.
* @mc: Cache of pre-allocated GFP_PGTABLE_USER memory from which to
* allocate page-table pages.
*
* The offset of @addr within a page is ignored, @size is rounded-up to
* the next page boundary and @phys is rounded-down to the previous page
* boundary.
*
* If device attributes are not explicitly requested in @prot, then the
* mapping will be normal, cacheable.
*
* Note that this function will both coalesce existing table entries and split
* existing block mappings, relying on page-faults to fault back areas outside
* of the new mapping lazily.
*
* Return: 0 on success, negative error code on failure.
*/
int kvm_pgtable_stage2_map(struct kvm_pgtable *pgt, u64 addr, u64 size,
u64 phys, enum kvm_pgtable_prot prot,
struct kvm_mmu_memory_cache *mc);
/**
* kvm_pgtable_stage2_unmap() - Remove a mapping from a guest stage-2 page-table.
* @pgt: Page-table structure initialised by kvm_pgtable_stage2_init().
* @addr: Intermediate physical address from which to remove the mapping.
* @size: Size of the mapping.
*
* The offset of @addr within a page is ignored and @size is rounded-up to
* the next page boundary.
*
* TLB invalidation is performed for each page-table entry cleared during the
* unmapping operation and the reference count for the page-table page
* containing the cleared entry is decremented, with unreferenced pages being
* freed. Unmapping a cacheable page will ensure that it is clean to the PoC if
* FWB is not supported by the CPU.
*
* Return: 0 on success, negative error code on failure.
*/
int kvm_pgtable_stage2_unmap(struct kvm_pgtable *pgt, u64 addr, u64 size);
/**
* kvm_pgtable_stage2_wrprotect() - Write-protect guest stage-2 address range
* without TLB invalidation.
* @pgt: Page-table structure initialised by kvm_pgtable_stage2_init().
* @addr: Intermediate physical address from which to write-protect,
* @size: Size of the range.
*
* The offset of @addr within a page is ignored and @size is rounded-up to
* the next page boundary.
*
* Note that it is the caller's responsibility to invalidate the TLB after
* calling this function to ensure that the updated permissions are visible
* to the CPUs.
*
* Return: 0 on success, negative error code on failure.
*/
int kvm_pgtable_stage2_wrprotect(struct kvm_pgtable *pgt, u64 addr, u64 size);
/**
* kvm_pgtable_stage2_mkyoung() - Set the access flag in a page-table entry.
* @pgt: Page-table structure initialised by kvm_pgtable_stage2_init().
* @addr: Intermediate physical address to identify the page-table entry.
*
* The offset of @addr within a page is ignored.
*
* If there is a valid, leaf page-table entry used to translate @addr, then
* set the access flag in that entry.
*
* Return: The old page-table entry prior to setting the flag, 0 on failure.
*/
kvm_pte_t kvm_pgtable_stage2_mkyoung(struct kvm_pgtable *pgt, u64 addr);
/**
* kvm_pgtable_stage2_mkold() - Clear the access flag in a page-table entry.
* @pgt: Page-table structure initialised by kvm_pgtable_stage2_init().
* @addr: Intermediate physical address to identify the page-table entry.
*
* The offset of @addr within a page is ignored.
*
* If there is a valid, leaf page-table entry used to translate @addr, then
* clear the access flag in that entry.
*
* Note that it is the caller's responsibility to invalidate the TLB after
* calling this function to ensure that the updated permissions are visible
* to the CPUs.
*
* Return: The old page-table entry prior to clearing the flag, 0 on failure.
*/
kvm_pte_t kvm_pgtable_stage2_mkold(struct kvm_pgtable *pgt, u64 addr);
/**
* kvm_pgtable_stage2_relax_perms() - Relax the permissions enforced by a
* page-table entry.
* @pgt: Page-table structure initialised by kvm_pgtable_stage2_init().
* @addr: Intermediate physical address to identify the page-table entry.
* @prot: Additional permissions to grant for the mapping.
*
* The offset of @addr within a page is ignored.
*
* If there is a valid, leaf page-table entry used to translate @addr, then
* relax the permissions in that entry according to the read, write and
* execute permissions specified by @prot. No permissions are removed, and
* TLB invalidation is performed after updating the entry.
*
* Return: 0 on success, negative error code on failure.
*/
int kvm_pgtable_stage2_relax_perms(struct kvm_pgtable *pgt, u64 addr,
enum kvm_pgtable_prot prot);
/**
* kvm_pgtable_stage2_is_young() - Test whether a page-table entry has the
* access flag set.
* @pgt: Page-table structure initialised by kvm_pgtable_stage2_init().
* @addr: Intermediate physical address to identify the page-table entry.
*
* The offset of @addr within a page is ignored.
*
* Return: True if the page-table entry has the access flag set, false otherwise.
*/
bool kvm_pgtable_stage2_is_young(struct kvm_pgtable *pgt, u64 addr);
/**
* kvm_pgtable_stage2_flush_range() - Clean and invalidate data cache to Point
* of Coherency for guest stage-2 address
* range.
* @pgt: Page-table structure initialised by kvm_pgtable_stage2_init().
* @addr: Intermediate physical address from which to flush.
* @size: Size of the range.
*
* The offset of @addr within a page is ignored and @size is rounded-up to
* the next page boundary.
*
* Return: 0 on success, negative error code on failure.
*/
int kvm_pgtable_stage2_flush(struct kvm_pgtable *pgt, u64 addr, u64 size);
/**
* kvm_pgtable_walk() - Walk a page-table.
* @pgt: Page-table structure initialised by kvm_pgtable_*_init().
* @addr: Input address for the start of the walk.
* @size: Size of the range to walk.
* @walker: Walker callback description.
*
* The offset of @addr within a page is ignored and @size is rounded-up to
* the next page boundary.
*
* The walker will walk the page-table entries corresponding to the input
* address range specified, visiting entries according to the walker flags.
* Invalid entries are treated as leaf entries. Leaf entries are reloaded
* after invoking the walker callback, allowing the walker to descend into
* a newly installed table.
*
* Returning a negative error code from the walker callback function will
* terminate the walk immediately with the same error code.
*
* Return: 0 on success, negative error code on failure.
*/
int kvm_pgtable_walk(struct kvm_pgtable *pgt, u64 addr, u64 size,
struct kvm_pgtable_walker *walker);
#endif /* __ARM64_KVM_PGTABLE_H__ */

6
arch/arm64/include/asm/kvm_ptrauth.h
View File

@ -60,7 +60,7 @@
.endm
/*
* Both ptrauth_switch_to_guest and ptrauth_switch_to_host macros will
* Both ptrauth_switch_to_guest and ptrauth_switch_to_hyp macros will
* check for the presence ARM64_HAS_ADDRESS_AUTH, which is defined as
* (ARM64_HAS_ADDRESS_AUTH_ARCH || ARM64_HAS_ADDRESS_AUTH_IMP_DEF) and
* then proceed ahead with the save/restore of Pointer Authentication
@ -78,7 +78,7 @@ alternative_else_nop_endif
.L__skip_switch\@:
.endm
.macro ptrauth_switch_to_host g_ctxt, h_ctxt, reg1, reg2, reg3
.macro ptrauth_switch_to_hyp g_ctxt, h_ctxt, reg1, reg2, reg3
alternative_if_not ARM64_HAS_ADDRESS_AUTH
b .L__skip_switch\@
alternative_else_nop_endif
@ -96,7 +96,7 @@ alternative_else_nop_endif
#else /* !CONFIG_ARM64_PTR_AUTH */
.macro ptrauth_switch_to_guest g_ctxt, reg1, reg2, reg3
.endm
.macro ptrauth_switch_to_host g_ctxt, h_ctxt, reg1, reg2, reg3
.macro ptrauth_switch_to_hyp g_ctxt, h_ctxt, reg1, reg2, reg3
.endm
#endif /* CONFIG_ARM64_PTR_AUTH */
#endif /* __ASSEMBLY__ */

28
arch/arm64/include/asm/percpu.h
View File

@ -19,7 +19,16 @@ static inline void set_my_cpu_offset(unsigned long off)
:: "r" (off) : "memory");
}
static inline unsigned long __my_cpu_offset(void)
static inline unsigned long __hyp_my_cpu_offset(void)
{
/*
* Non-VHE hyp code runs with preemption disabled. No need to hazard
* the register access against barrier() as in __kern_my_cpu_offset.
*/
return read_sysreg(tpidr_el2);
}
static inline unsigned long __kern_my_cpu_offset(void)
{
unsigned long off;
@ -35,7 +44,12 @@ static inline unsigned long __my_cpu_offset(void)
return off;
}
#define __my_cpu_offset __my_cpu_offset()
#ifdef __KVM_NVHE_HYPERVISOR__
#define __my_cpu_offset __hyp_my_cpu_offset()
#else
#define __my_cpu_offset __kern_my_cpu_offset()
#endif
#define PERCPU_RW_OPS(sz) \
static inline unsigned long __percpu_read_##sz(void *ptr) \
@ -227,4 +241,14 @@ PERCPU_RET_OP(add, add, ldadd)
#include <asm-generic/percpu.h>
/* Redefine macros for nVHE hyp under DEBUG_PREEMPT to avoid its dependencies. */
#if defined(__KVM_NVHE_HYPERVISOR__) && defined(CONFIG_DEBUG_PREEMPT)
#undef this_cpu_ptr
#define this_cpu_ptr raw_cpu_ptr
#undef __this_cpu_read
#define __this_cpu_read raw_cpu_read
#undef __this_cpu_write
#define __this_cpu_write raw_cpu_write
#endif
#endif /* __ASM_PERCPU_H */

24
arch/arm64/include/asm/pgtable-hwdef.h
View File

@ -146,7 +146,6 @@
#define PTE_CONT (_AT(pteval_t, 1) << 52) /* Contiguous range */
#define PTE_PXN (_AT(pteval_t, 1) << 53) /* Privileged XN */
#define PTE_UXN (_AT(pteval_t, 1) << 54) /* User XN */
#define PTE_HYP_XN (_AT(pteval_t, 1) << 54) /* HYP XN */
#define PTE_ADDR_LOW (((_AT(pteval_t, 1) << (48 - PAGE_SHIFT)) - 1) << PAGE_SHIFT)
#ifdef CONFIG_ARM64_PA_BITS_52
@ -162,34 +161,11 @@
#define PTE_ATTRINDX(t) (_AT(pteval_t, (t)) << 2)
#define PTE_ATTRINDX_MASK (_AT(pteval_t, 7) << 2)
/*
* 2nd stage PTE definitions
*/
#define PTE_S2_RDONLY (_AT(pteval_t, 1) << 6) /* HAP[2:1] */
#define PTE_S2_RDWR (_AT(pteval_t, 3) << 6) /* HAP[2:1] */
#define PTE_S2_XN (_AT(pteval_t, 2) << 53) /* XN[1:0] */
#define PTE_S2_SW_RESVD (_AT(pteval_t, 15) << 55) /* Reserved for SW */
#define PMD_S2_RDONLY (_AT(pmdval_t, 1) << 6) /* HAP[2:1] */
#define PMD_S2_RDWR (_AT(pmdval_t, 3) << 6) /* HAP[2:1] */
#define PMD_S2_XN (_AT(pmdval_t, 2) << 53) /* XN[1:0] */
#define PMD_S2_SW_RESVD (_AT(pmdval_t, 15) << 55) /* Reserved for SW */
#define PUD_S2_RDONLY (_AT(pudval_t, 1) << 6) /* HAP[2:1] */
#define PUD_S2_RDWR (_AT(pudval_t, 3) << 6) /* HAP[2:1] */
#define PUD_S2_XN (_AT(pudval_t, 2) << 53) /* XN[1:0] */
/*
* Memory Attribute override for Stage-2 (MemAttr[3:0])
*/
#define PTE_S2_MEMATTR(t) (_AT(pteval_t, (t)) << 2)
/*
* EL2/HYP PTE/PMD definitions
*/
#define PMD_HYP PMD_SECT_USER
#define PTE_HYP PTE_USER
/*
* Highest possible physical address supported.
*/

19
arch/arm64/include/asm/pgtable-prot.h
View File

@ -64,7 +64,6 @@ extern bool arm64_use_ng_mappings;
#define PROT_SECT_NORMAL_EXEC (PROT_SECT_DEFAULT | PMD_SECT_UXN | PMD_ATTRINDX(MT_NORMAL))
#define _PAGE_DEFAULT (_PROT_DEFAULT | PTE_ATTRINDX(MT_NORMAL))
#define _HYP_PAGE_DEFAULT _PAGE_DEFAULT
#define PAGE_KERNEL __pgprot(PROT_NORMAL)
#define PAGE_KERNEL_TAGGED __pgprot(PROT_NORMAL_TAGGED)
@ -73,11 +72,6 @@ extern bool arm64_use_ng_mappings;
#define PAGE_KERNEL_EXEC __pgprot(PROT_NORMAL & ~PTE_PXN)
#define PAGE_KERNEL_EXEC_CONT __pgprot((PROT_NORMAL & ~PTE_PXN) | PTE_CONT)
#define PAGE_HYP __pgprot(_HYP_PAGE_DEFAULT | PTE_HYP | PTE_HYP_XN)
#define PAGE_HYP_EXEC __pgprot(_HYP_PAGE_DEFAULT | PTE_HYP | PTE_RDONLY)
#define PAGE_HYP_RO __pgprot(_HYP_PAGE_DEFAULT | PTE_HYP | PTE_RDONLY | PTE_HYP_XN)
#define PAGE_HYP_DEVICE __pgprot(_PROT_DEFAULT | PTE_ATTRINDX(MT_DEVICE_nGnRE) | PTE_HYP | PTE_HYP_XN)
#define PAGE_S2_MEMATTR(attr) \
({ \
u64 __val; \
@ -88,19 +82,6 @@ extern bool arm64_use_ng_mappings;
__val; \
})
#define PAGE_S2_XN \
({ \
u64 __val; \
if (cpus_have_const_cap(ARM64_HAS_CACHE_DIC)) \
__val = 0; \
else \
__val = PTE_S2_XN; \
__val; \
})
#define PAGE_S2 __pgprot(_PROT_DEFAULT | PAGE_S2_MEMATTR(NORMAL) | PTE_S2_RDONLY | PAGE_S2_XN)
#define PAGE_S2_DEVICE __pgprot(_PROT_DEFAULT | PAGE_S2_MEMATTR(DEVICE_nGnRE) | PTE_S2_RDONLY | PTE_S2_XN)
#define PAGE_NONE __pgprot(((_PAGE_DEFAULT) & ~PTE_VALID) | PTE_PROT_NONE | PTE_RDONLY | PTE_NG | PTE_PXN | PTE_UXN)
/* shared+writable pages are clean by default, hence PTE_RDONLY|PTE_WRITE */
#define PAGE_SHARED __pgprot(_PAGE_DEFAULT | PTE_USER | PTE_RDONLY | PTE_NG | PTE_PXN | PTE_UXN | PTE_WRITE)

215
arch/arm64/include/asm/stage2_pgtable.h
View File

@ -8,7 +8,6 @@
#ifndef __ARM64_S2_PGTABLE_H_
#define __ARM64_S2_PGTABLE_H_
#include <linux/hugetlb.h>
#include <linux/pgtable.h>
/*
@ -36,21 +35,6 @@
#define stage2_pgdir_size(kvm) (1ULL << stage2_pgdir_shift(kvm))
#define stage2_pgdir_mask(kvm) ~(stage2_pgdir_size(kvm) - 1)
/*
* The number of PTRS across all concatenated stage2 tables given by the
* number of bits resolved at the initial level.
* If we force more levels than necessary, we may have (stage2_pgdir_shift > IPA),
* in which case, stage2_pgd_ptrs will have one entry.
*/
#define pgd_ptrs_shift(ipa, pgdir_shift) \
((ipa) > (pgdir_shift) ? ((ipa) - (pgdir_shift)) : 0)
#define __s2_pgd_ptrs(ipa, lvls) \
(1 << (pgd_ptrs_shift((ipa), pt_levels_pgdir_shift(lvls))))
#define __s2_pgd_size(ipa, lvls) (__s2_pgd_ptrs((ipa), (lvls)) * sizeof(pgd_t))
#define stage2_pgd_ptrs(kvm) __s2_pgd_ptrs(kvm_phys_shift(kvm), kvm_stage2_levels(kvm))
#define stage2_pgd_size(kvm) __s2_pgd_size(kvm_phys_shift(kvm), kvm_stage2_levels(kvm))
/*
* kvm_mmmu_cache_min_pages() is the number of pages required to install
* a stage-2 translation. We pre-allocate the entry level page table at
@ -58,196 +42,6 @@
*/
#define kvm_mmu_cache_min_pages(kvm) (kvm_stage2_levels(kvm) - 1)
/* Stage2 PUD definitions when the level is present */
static inline bool kvm_stage2_has_pud(struct kvm *kvm)
{
return (CONFIG_PGTABLE_LEVELS > 3) && (kvm_stage2_levels(kvm) > 3);
}
#define S2_PUD_SHIFT ARM64_HW_PGTABLE_LEVEL_SHIFT(1)
#define S2_PUD_SIZE (1UL << S2_PUD_SHIFT)
#define S2_PUD_MASK (~(S2_PUD_SIZE - 1))
#define stage2_pgd_none(kvm, pgd) pgd_none(pgd)
#define stage2_pgd_clear(kvm, pgd) pgd_clear(pgd)
#define stage2_pgd_present(kvm, pgd) pgd_present(pgd)
#define stage2_pgd_populate(kvm, pgd, p4d) pgd_populate(NULL, pgd, p4d)
static inline p4d_t *stage2_p4d_offset(struct kvm *kvm,
pgd_t *pgd, unsigned long address)
{
return p4d_offset(pgd, address);
}
static inline void stage2_p4d_free(struct kvm *kvm, p4d_t *p4d)
{
}
static inline bool stage2_p4d_table_empty(struct kvm *kvm, p4d_t *p4dp)
{
return false;
}
static inline phys_addr_t stage2_p4d_addr_end(struct kvm *kvm,
phys_addr_t addr, phys_addr_t end)
{
return end;
}
static inline bool stage2_p4d_none(struct kvm *kvm, p4d_t p4d)
{
if (kvm_stage2_has_pud(kvm))
return p4d_none(p4d);
else
return 0;
}
static inline void stage2_p4d_clear(struct kvm *kvm, p4d_t *p4dp)
{
if (kvm_stage2_has_pud(kvm))
p4d_clear(p4dp);
}
static inline bool stage2_p4d_present(struct kvm *kvm, p4d_t p4d)
{
if (kvm_stage2_has_pud(kvm))
return p4d_present(p4d);
else
return 1;
}
static inline void stage2_p4d_populate(struct kvm *kvm, p4d_t *p4d, pud_t *pud)
{
if (kvm_stage2_has_pud(kvm))
p4d_populate(NULL, p4d, pud);
}
static inline pud_t *stage2_pud_offset(struct kvm *kvm,
p4d_t *p4d, unsigned long address)
{
if (kvm_stage2_has_pud(kvm))
return pud_offset(p4d, address);
else
return (pud_t *)p4d;
}
static inline void stage2_pud_free(struct kvm *kvm, pud_t *pud)
{
if (kvm_stage2_has_pud(kvm))
free_page((unsigned long)pud);
}
static inline bool stage2_pud_table_empty(struct kvm *kvm, pud_t *pudp)
{
if (kvm_stage2_has_pud(kvm))
return kvm_page_empty(pudp);
else
return false;
}
static inline phys_addr_t
stage2_pud_addr_end(struct kvm *kvm, phys_addr_t addr, phys_addr_t end)
{
if (kvm_stage2_has_pud(kvm)) {
phys_addr_t boundary = (addr + S2_PUD_SIZE) & S2_PUD_MASK;
return (boundary - 1 < end - 1) ? boundary : end;
} else {
return end;
}
}
/* Stage2 PMD definitions when the level is present */
static inline bool kvm_stage2_has_pmd(struct kvm *kvm)
{
return (CONFIG_PGTABLE_LEVELS > 2) && (kvm_stage2_levels(kvm) > 2);
}
#define S2_PMD_SHIFT ARM64_HW_PGTABLE_LEVEL_SHIFT(2)
#define S2_PMD_SIZE (1UL << S2_PMD_SHIFT)
#define S2_PMD_MASK (~(S2_PMD_SIZE - 1))
static inline bool stage2_pud_none(struct kvm *kvm, pud_t pud)
{
if (kvm_stage2_has_pmd(kvm))
return pud_none(pud);
else
return 0;
}
static inline void stage2_pud_clear(struct kvm *kvm, pud_t *pud)
{
if (kvm_stage2_has_pmd(kvm))
pud_clear(pud);
}
static inline bool stage2_pud_present(struct kvm *kvm, pud_t pud)
{
if (kvm_stage2_has_pmd(kvm))
return pud_present(pud);
else
return 1;
}
static inline void stage2_pud_populate(struct kvm *kvm, pud_t *pud, pmd_t *pmd)
{
if (kvm_stage2_has_pmd(kvm))
pud_populate(NULL, pud, pmd);
}
static inline pmd_t *stage2_pmd_offset(struct kvm *kvm,
pud_t *pud, unsigned long address)
{
if (kvm_stage2_has_pmd(kvm))
return pmd_offset(pud, address);
else
return (pmd_t *)pud;
}
static inline void stage2_pmd_free(struct kvm *kvm, pmd_t *pmd)
{
if (kvm_stage2_has_pmd(kvm))
free_page((unsigned long)pmd);
}
static inline bool stage2_pud_huge(struct kvm *kvm, pud_t pud)
{
if (kvm_stage2_has_pmd(kvm))
return pud_huge(pud);
else
return 0;
}
static inline bool stage2_pmd_table_empty(struct kvm *kvm, pmd_t *pmdp)
{
if (kvm_stage2_has_pmd(kvm))
return kvm_page_empty(pmdp);
else
return 0;
}
static inline phys_addr_t
stage2_pmd_addr_end(struct kvm *kvm, phys_addr_t addr, phys_addr_t end)
{
if (kvm_stage2_has_pmd(kvm)) {
phys_addr_t boundary = (addr + S2_PMD_SIZE) & S2_PMD_MASK;
return (boundary - 1 < end - 1) ? boundary : end;
} else {
return end;
}
}
static inline bool stage2_pte_table_empty(struct kvm *kvm, pte_t *ptep)
{
return kvm_page_empty(ptep);
}
static inline unsigned long stage2_pgd_index(struct kvm *kvm, phys_addr_t addr)
{
return (((addr) >> stage2_pgdir_shift(kvm)) & (stage2_pgd_ptrs(kvm) - 1));
}
static inline phys_addr_t
stage2_pgd_addr_end(struct kvm *kvm, phys_addr_t addr, phys_addr_t end)
{
@ -256,13 +50,4 @@ stage2_pgd_addr_end(struct kvm *kvm, phys_addr_t addr, phys_addr_t end)
return (boundary - 1 < end - 1) ? boundary : end;
}
/*
* Level values for the ARMv8.4-TTL extension, mapping PUD/PMD/PTE and
* the architectural page-table level.
*/
#define S2_NO_LEVEL_HINT 0
#define S2_PUD_LEVEL 1
#define S2_PMD_LEVEL 2
#define S2_PTE_LEVEL 3
#endif /* __ARM64_S2_PGTABLE_H_ */

16
arch/arm64/include/uapi/asm/kvm.h
View File

@ -159,6 +159,21 @@ struct kvm_sync_regs {
struct kvm_arch_memory_slot {
};
/*
* PMU filter structure. Describe a range of events with a particular
* action. To be used with KVM_ARM_VCPU_PMU_V3_FILTER.
*/
struct kvm_pmu_event_filter {
__u16 base_event;
__u16 nevents;
#define KVM_PMU_EVENT_ALLOW 0
#define KVM_PMU_EVENT_DENY 1
__u8 action;
__u8 pad[3];
};
/* for KVM_GET/SET_VCPU_EVENTS */
struct kvm_vcpu_events {
struct {
@ -338,6 +353,7 @@ struct kvm_vcpu_events {
#define KVM_ARM_VCPU_PMU_V3_CTRL 0
#define KVM_ARM_VCPU_PMU_V3_IRQ 0
#define KVM_ARM_VCPU_PMU_V3_INIT 1
#define KVM_ARM_VCPU_PMU_V3_FILTER 2
#define KVM_ARM_VCPU_TIMER_CTRL 1
#define KVM_ARM_VCPU_TIMER_IRQ_VTIMER 0
#define KVM_ARM_VCPU_TIMER_IRQ_PTIMER 1

3
arch/arm64/kernel/image-vars.h
View File

@ -61,14 +61,11 @@ __efistub__ctype = _ctype;
* memory mappings.
*/
#define KVM_NVHE_ALIAS(sym) __kvm_nvhe_##sym = sym;
/* Alternative callbacks for init-time patching of nVHE hyp code. */
KVM_NVHE_ALIAS(kvm_patch_vector_branch);
KVM_NVHE_ALIAS(kvm_update_va_mask);
/* Global kernel state accessed by nVHE hyp code. */
KVM_NVHE_ALIAS(kvm_host_data);
KVM_NVHE_ALIAS(kvm_vgic_global_state);
/* Kernel constant needed to compute idmap addresses. */

13
arch/arm64/kernel/vmlinux.lds.S
View File

@ -10,6 +10,7 @@
#include <asm-generic/vmlinux.lds.h>
#include <asm/cache.h>
#include <asm/hyp_image.h>
#include <asm/kernel-pgtable.h>
#include <asm/memory.h>
#include <asm/page.h>
@ -22,12 +23,23 @@ ENTRY(_text)
jiffies = jiffies_64;
#ifdef CONFIG_KVM
#define HYPERVISOR_EXTABLE \
. = ALIGN(SZ_8); \
__start___kvm_ex_table = .; \
*(__kvm_ex_table) \
__stop___kvm_ex_table = .;
#define HYPERVISOR_PERCPU_SECTION \
. = ALIGN(PAGE_SIZE); \
HYP_SECTION_NAME(.data..percpu) : { \
*(HYP_SECTION_NAME(.data..percpu)) \
}
#else /* CONFIG_KVM */
#define HYPERVISOR_EXTABLE
#define HYPERVISOR_PERCPU_SECTION
#endif
#define HYPERVISOR_TEXT \
/* \
* Align to 4 KB so that \
@ -196,6 +208,7 @@ SECTIONS
}
PERCPU_SECTION(L1_CACHE_BYTES)
HYPERVISOR_PERCPU_SECTION
.rela.dyn : ALIGN(8) {
*(.rela .rela*)

2
arch/arm64/kvm/Makefile
View File

@ -13,7 +13,7 @@ obj-$(CONFIG_KVM) += hyp/
kvm-y := $(KVM)/kvm_main.o $(KVM)/coalesced_mmio.o $(KVM)/eventfd.o \
$(KVM)/vfio.o $(KVM)/irqchip.o \
arm.o mmu.o mmio.o psci.o perf.o hypercalls.o pvtime.o \
inject_fault.o regmap.o va_layout.o hyp.o handle_exit.o \
inject_fault.o regmap.o va_layout.o handle_exit.o \
guest.o debug.o reset.o sys_regs.o \
vgic-sys-reg-v3.o fpsimd.o pmu.o \
aarch32.o arch_timer.o \

70
arch/arm64/kvm/arm.c
View File

@ -46,8 +46,10 @@
__asm__(".arch_extension virt");
#endif
DEFINE_PER_CPU(kvm_host_data_t, kvm_host_data);
DECLARE_KVM_HYP_PER_CPU(unsigned long, kvm_hyp_vector);
static DEFINE_PER_CPU(unsigned long, kvm_arm_hyp_stack_page);
unsigned long kvm_arm_hyp_percpu_base[NR_CPUS];
/* The VMID used in the VTTBR */
static atomic64_t kvm_vmid_gen = ATOMIC64_INIT(1);
@ -145,6 +147,8 @@ void kvm_arch_destroy_vm(struct kvm *kvm)
{
int i;
bitmap_free(kvm->arch.pmu_filter);
kvm_vgic_destroy(kvm);
for (i = 0; i < KVM_MAX_VCPUS; ++i) {
@ -286,7 +290,7 @@ void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
if (vcpu->arch.has_run_once && unlikely(!irqchip_in_kernel(vcpu->kvm)))
static_branch_dec(&userspace_irqchip_in_use);
kvm_mmu_free_memory_caches(vcpu);
kvm_mmu_free_memory_cache(&vcpu->arch.mmu_page_cache);
kvm_timer_vcpu_terminate(vcpu);
kvm_pmu_vcpu_destroy(vcpu);
@ -1259,6 +1263,19 @@ long kvm_arch_vm_ioctl(struct file *filp,
}
}
static unsigned long nvhe_percpu_size(void)
{
return (unsigned long)CHOOSE_NVHE_SYM(__per_cpu_end) -
(unsigned long)CHOOSE_NVHE_SYM(__per_cpu_start);
}
static unsigned long nvhe_percpu_order(void)
{
unsigned long size = nvhe_percpu_size();
return size ? get_order(size) : 0;
}
static int kvm_map_vectors(void)
{
/*
@ -1299,6 +1316,7 @@ static void cpu_init_hyp_mode(void)
unsigned long hyp_stack_ptr;
unsigned long vector_ptr;
unsigned long tpidr_el2;
struct arm_smccc_res res;
/* Switch from the HYP stub to our own HYP init vector */
__hyp_set_vectors(kvm_get_idmap_vector());
@ -1308,12 +1326,13 @@ static void cpu_init_hyp_mode(void)
* kernel's mapping to the linear mapping, and store it in tpidr_el2
* so that we can use adr_l to access per-cpu variables in EL2.
*/
tpidr_el2 = ((unsigned long)this_cpu_ptr(&kvm_host_data) -
(unsigned long)kvm_ksym_ref(&kvm_host_data));
tpidr_el2 = (unsigned long)this_cpu_ptr_nvhe_sym(__per_cpu_start) -
(unsigned long)kvm_ksym_ref(CHOOSE_NVHE_SYM(__per_cpu_start));
pgd_ptr = kvm_mmu_get_httbr();
hyp_stack_ptr = __this_cpu_read(kvm_arm_hyp_stack_page) + PAGE_SIZE;
vector_ptr = (unsigned long)kvm_get_hyp_vector();
hyp_stack_ptr = kern_hyp_va(hyp_stack_ptr);
vector_ptr = (unsigned long)kern_hyp_va(kvm_ksym_ref(__kvm_hyp_host_vector));
/*
* Call initialization code, and switch to the full blown HYP code.
@ -1322,7 +1341,9 @@ static void cpu_init_hyp_mode(void)
* cpus_have_const_cap() wrapper.
*/
BUG_ON(!system_capabilities_finalized());
__kvm_call_hyp((void *)pgd_ptr, hyp_stack_ptr, vector_ptr, tpidr_el2);
arm_smccc_1_1_hvc(KVM_HOST_SMCCC_FUNC(__kvm_hyp_init),
pgd_ptr, tpidr_el2, hyp_stack_ptr, vector_ptr, &res);
WARN_ON(res.a0 != SMCCC_RET_SUCCESS);
/*
* Disabling SSBD on a non-VHE system requires us to enable SSBS
@ -1342,10 +1363,12 @@ static void cpu_hyp_reset(void)
static void cpu_hyp_reinit(void)
{
kvm_init_host_cpu_context(&this_cpu_ptr(&kvm_host_data)->host_ctxt);
kvm_init_host_cpu_context(&this_cpu_ptr_hyp_sym(kvm_host_data)->host_ctxt);
cpu_hyp_reset();
*this_cpu_ptr_hyp_sym(kvm_hyp_vector) = (unsigned long)kvm_get_hyp_vector();
if (is_kernel_in_hyp_mode())
kvm_timer_init_vhe();
else
@ -1496,8 +1519,10 @@ static void teardown_hyp_mode(void)
int cpu;
free_hyp_pgds();
for_each_possible_cpu(cpu)
for_each_possible_cpu(cpu) {
free_page(per_cpu(kvm_arm_hyp_stack_page, cpu));
free_pages(kvm_arm_hyp_percpu_base[cpu], nvhe_percpu_order());
}
}
/**
@ -1530,6 +1555,24 @@ static int init_hyp_mode(void)
per_cpu(kvm_arm_hyp_stack_page, cpu) = stack_page;
}
/*
* Allocate and initialize pages for Hypervisor-mode percpu regions.
*/
for_each_possible_cpu(cpu) {
struct page *page;
void *page_addr;
page = alloc_pages(GFP_KERNEL, nvhe_percpu_order());
if (!page) {
err = -ENOMEM;
goto out_err;
}
page_addr = page_address(page);
memcpy(page_addr, CHOOSE_NVHE_SYM(__per_cpu_start), nvhe_percpu_size());
kvm_arm_hyp_percpu_base[cpu] = (unsigned long)page_addr;
}
/*
* Map the Hyp-code called directly from the host
*/
@ -1574,14 +1617,17 @@ static int init_hyp_mode(void)
}
}
/*
* Map Hyp percpu pages
*/
for_each_possible_cpu(cpu) {
kvm_host_data_t *cpu_data;
char *percpu_begin = (char *)kvm_arm_hyp_percpu_base[cpu];
char *percpu_end = percpu_begin + nvhe_percpu_size();
cpu_data = per_cpu_ptr(&kvm_host_data, cpu);
err = create_hyp_mappings(cpu_data, cpu_data + 1, PAGE_HYP);
err = create_hyp_mappings(percpu_begin, percpu_end, PAGE_HYP);
if (err) {
kvm_err("Cannot map host CPU state: %d\n", err);
kvm_err("Cannot map hyp percpu region\n");
goto out_err;
}
}

34
arch/arm64/kvm/hyp.S
View File

@ -1,34 +0,0 @@
/* SPDX-License-Identifier: GPL-2.0-only */
/*
* Copyright (C) 2012,2013 - ARM Ltd
* Author: Marc Zyngier <marc.zyngier@arm.com>
*/
#include <linux/linkage.h>
#include <asm/alternative.h>
#include <asm/assembler.h>
#include <asm/cpufeature.h>
/*
* u64 __kvm_call_hyp(void *hypfn, ...);
*
* This is not really a variadic function in the classic C-way and care must
* be taken when calling this to ensure parameters are passed in registers
* only, since the stack will change between the caller and the callee.
*
* Call the function with the first argument containing a pointer to the
* function you wish to call in Hyp mode, and subsequent arguments will be
* passed as x0, x1, and x2 (a maximum of 3 arguments in addition to the
* function pointer can be passed). The function being called must be mapped
* in Hyp mode (see init_hyp_mode in arch/arm/kvm/arm.c). Return values are
* passed in x0.
*
* A function pointer with a value less than 0xfff has a special meaning,
* and is used to implement hyp stubs in the same way as in
* arch/arm64/kernel/hyp_stub.S.
*/
SYM_FUNC_START(__kvm_call_hyp)
hvc #0
ret
SYM_FUNC_END(__kvm_call_hyp)

2
arch/arm64/kvm/hyp/Makefile
View File

@ -10,4 +10,4 @@ subdir-ccflags-y := -I$(incdir) \
-DDISABLE_BRANCH_PROFILING \
$(DISABLE_STACKLEAK_PLUGIN)
obj-$(CONFIG_KVM) += vhe/ nvhe/ smccc_wa.o
obj-$(CONFIG_KVM) += vhe/ nvhe/ pgtable.o smccc_wa.o

95
arch/arm64/kvm/hyp/entry.S
View File

@ -7,7 +7,6 @@
#include <linux/linkage.h>
#include <asm/alternative.h>
#include <asm/asm-offsets.h>
#include <asm/assembler.h>
#include <asm/fpsimdmacros.h>
#include <asm/kvm.h>
@ -16,66 +15,28 @@
#include <asm/kvm_mmu.h>
#include <asm/kvm_ptrauth.h>
#define CPU_XREG_OFFSET(x) (CPU_USER_PT_REGS + 8*x)
#define CPU_SP_EL0_OFFSET (CPU_XREG_OFFSET(30) + 8)
.text
/*
* We treat x18 as callee-saved as the host may use it as a platform
* register (e.g. for shadow call stack).
*/
.macro save_callee_saved_regs ctxt
str x18, [\ctxt, #CPU_XREG_OFFSET(18)]
stp x19, x20, [\ctxt, #CPU_XREG_OFFSET(19)]
stp x21, x22, [\ctxt, #CPU_XREG_OFFSET(21)]
stp x23, x24, [\ctxt, #CPU_XREG_OFFSET(23)]
stp x25, x26, [\ctxt, #CPU_XREG_OFFSET(25)]
stp x27, x28, [\ctxt, #CPU_XREG_OFFSET(27)]
stp x29, lr, [\ctxt, #CPU_XREG_OFFSET(29)]
.endm
.macro restore_callee_saved_regs ctxt
// We require \ctxt is not x18-x28
ldr x18, [\ctxt, #CPU_XREG_OFFSET(18)]
ldp x19, x20, [\ctxt, #CPU_XREG_OFFSET(19)]
ldp x21, x22, [\ctxt, #CPU_XREG_OFFSET(21)]
ldp x23, x24, [\ctxt, #CPU_XREG_OFFSET(23)]
ldp x25, x26, [\ctxt, #CPU_XREG_OFFSET(25)]
ldp x27, x28, [\ctxt, #CPU_XREG_OFFSET(27)]
ldp x29, lr, [\ctxt, #CPU_XREG_OFFSET(29)]
.endm
.macro save_sp_el0 ctxt, tmp
mrs \tmp, sp_el0
str \tmp, [\ctxt, #CPU_SP_EL0_OFFSET]
.endm
.macro restore_sp_el0 ctxt, tmp
ldr \tmp, [\ctxt, #CPU_SP_EL0_OFFSET]
msr sp_el0, \tmp
.endm
/*
* u64 __guest_enter(struct kvm_vcpu *vcpu,
* struct kvm_cpu_context *host_ctxt);
* u64 __guest_enter(struct kvm_vcpu *vcpu);
*/
SYM_FUNC_START(__guest_enter)
// x0: vcpu
// x1: host context
// x2-x17: clobbered by macros
// x1-x17: clobbered by macros
// x29: guest context
// Store the host regs
adr_this_cpu x1, kvm_hyp_ctxt, x2
// Store the hyp regs
save_callee_saved_regs x1
// Save the host's sp_el0
// Save hyp's sp_el0
save_sp_el0 x1, x2
// Now the host state is stored if we have a pending RAS SError it must
// affect the host. If any asynchronous exception is pending we defer
// the guest entry. The DSB isn't necessary before v8.2 as any SError
// would be fatal.
// Now the hyp state is stored if we have a pending RAS SError it must
// affect the host or hyp. If any asynchronous exception is pending we
// defer the guest entry. The DSB isn't necessary before v8.2 as any
// SError would be fatal.
alternative_if ARM64_HAS_RAS_EXTN
dsb nshst
isb
@ -86,6 +47,8 @@ alternative_else_nop_endif
ret
1:
set_loaded_vcpu x0, x1, x2
add x29, x0, #VCPU_CONTEXT
// Macro ptrauth_switch_to_guest format:
@ -116,6 +79,26 @@ alternative_else_nop_endif
eret
sb
SYM_INNER_LABEL(__guest_exit_panic, SYM_L_GLOBAL)
// x2-x29,lr: vcpu regs
// vcpu x0-x1 on the stack
// If the hyp context is loaded, go straight to hyp_panic
get_loaded_vcpu x0, x1
cbz x0, hyp_panic
// The hyp context is saved so make sure it is restored to allow
// hyp_panic to run at hyp and, subsequently, panic to run in the host.
// This makes use of __guest_exit to avoid duplication but sets the
// return address to tail call into hyp_panic. As a side effect, the
// current state is saved to the guest context but it will only be
// accurate if the guest had been completely restored.
adr_this_cpu x0, kvm_hyp_ctxt, x1
adr x1, hyp_panic
str x1, [x0, #CPU_XREG_OFFSET(30)]
get_vcpu_ptr x1, x0
SYM_INNER_LABEL(__guest_exit, SYM_L_GLOBAL)
// x0: return code
// x1: vcpu
@ -148,21 +131,23 @@ SYM_INNER_LABEL(__guest_exit, SYM_L_GLOBAL)
// Store the guest's sp_el0
save_sp_el0 x1, x2
get_host_ctxt x2, x3
adr_this_cpu x2, kvm_hyp_ctxt, x3
// Macro ptrauth_switch_to_guest format:
// ptrauth_switch_to_host(guest cxt, host cxt, tmp1, tmp2, tmp3)
// Macro ptrauth_switch_to_hyp format:
// ptrauth_switch_to_hyp(guest cxt, host cxt, tmp1, tmp2, tmp3)
// The below macro to save/restore keys is not implemented in C code
// as it may cause Pointer Authentication key signing mismatch errors
// when this feature is enabled for kernel code.
ptrauth_switch_to_host x1, x2, x3, x4, x5
ptrauth_switch_to_hyp x1, x2, x3, x4, x5
// Restore the hosts's sp_el0
// Restore hyp's sp_el0
restore_sp_el0 x2, x3
// Now restore the host regs
// Now restore the hyp regs
restore_callee_saved_regs x2
set_loaded_vcpu xzr, x1, x2
alternative_if ARM64_HAS_RAS_EXTN
// If we have the RAS extensions we can consume a pending error
// without an unmask-SError and isb. The ESB-instruction consumed any

76
arch/arm64/kvm/hyp/hyp-entry.S
View File

@ -12,7 +12,6 @@
#include <asm/cpufeature.h>
#include <asm/kvm_arm.h>
#include <asm/kvm_asm.h>
#include <asm/kvm_mmu.h>
#include <asm/mmu.h>
.macro save_caller_saved_regs_vect
@ -41,20 +40,6 @@
.text
.macro do_el2_call
/*
* Shuffle the parameters before calling the function
* pointed to in x0. Assumes parameters in x[1,2,3].
*/
str lr, [sp, #-16]!
mov lr, x0
mov x0, x1
mov x1, x2
mov x2, x3
blr lr
ldr lr, [sp], #16
.endm
el1_sync: // Guest trapped into EL2
mrs x0, esr_el2
@ -63,44 +48,6 @@ el1_sync: // Guest trapped into EL2
ccmp x0, #ESR_ELx_EC_HVC32, #4, ne
b.ne el1_trap
#ifdef __KVM_NVHE_HYPERVISOR__
mrs x1, vttbr_el2 // If vttbr is valid, the guest
cbnz x1, el1_hvc_guest // called HVC
/* Here, we're pretty sure the host called HVC. */
ldp x0, x1, [sp], #16
/* Check for a stub HVC call */
cmp x0, #HVC_STUB_HCALL_NR
b.hs 1f
/*
* Compute the idmap address of __kvm_handle_stub_hvc and
* jump there. Since we use kimage_voffset, do not use the
* HYP VA for __kvm_handle_stub_hvc, but the kernel VA instead
* (by loading it from the constant pool).
*
* Preserve x0-x4, which may contain stub parameters.
*/
ldr x5, =__kvm_handle_stub_hvc
ldr_l x6, kimage_voffset
/* x5 = __pa(x5) */
sub x5, x5, x6
br x5
1:
/*
* Perform the EL2 call
*/
kern_hyp_va x0
do_el2_call
eret
sb
#endif /* __KVM_NVHE_HYPERVISOR__ */
el1_hvc_guest:
/*
* Fastest possible path for ARM_SMCCC_ARCH_WORKAROUND_1.
* The workaround has already been applied on the host,
@ -169,24 +116,7 @@ el2_error:
eret
sb
#ifdef __KVM_NVHE_HYPERVISOR__
SYM_FUNC_START(__hyp_do_panic)
mov lr, #(PSR_F_BIT | PSR_I_BIT | PSR_A_BIT | PSR_D_BIT |\
PSR_MODE_EL1h)
msr spsr_el2, lr
ldr lr, =panic
msr elr_el2, lr
eret
sb
SYM_FUNC_END(__hyp_do_panic)
#endif
SYM_CODE_START(__hyp_panic)
get_host_ctxt x0, x1
b hyp_panic
SYM_CODE_END(__hyp_panic)
.macro invalid_vector label, target = __hyp_panic
.macro invalid_vector label, target = __guest_exit_panic
.align 2
SYM_CODE_START(\label)
b \target
@ -198,7 +128,6 @@ SYM_CODE_END(\label)
invalid_vector el2t_irq_invalid
invalid_vector el2t_fiq_invalid
invalid_vector el2t_error_invalid
invalid_vector el2h_sync_invalid
invalid_vector el2h_irq_invalid
invalid_vector el2h_fiq_invalid
invalid_vector el1_fiq_invalid
@ -228,10 +157,9 @@ check_preamble_length 661b, 662b
.macro invalid_vect target
.align 7
661:
b \target
nop
stp x0, x1, [sp, #-16]!
662:
ldp x0, x1, [sp], #16
b \target
check_preamble_length 661b, 662b

4
arch/arm64/kvm/hyp/include/hyp/debug-sr.h
View File

@ -135,7 +135,7 @@ static inline void __debug_switch_to_guest_common(struct kvm_vcpu *vcpu)
if (!(vcpu->arch.flags & KVM_ARM64_DEBUG_DIRTY))
return;
host_ctxt = &__hyp_this_cpu_ptr(kvm_host_data)->host_ctxt;
host_ctxt = &this_cpu_ptr(&kvm_host_data)->host_ctxt;
guest_ctxt = &vcpu->arch.ctxt;
host_dbg = &vcpu->arch.host_debug_state.regs;
guest_dbg = kern_hyp_va(vcpu->arch.debug_ptr);
@ -154,7 +154,7 @@ static inline void __debug_switch_to_host_common(struct kvm_vcpu *vcpu)
if (!(vcpu->arch.flags & KVM_ARM64_DEBUG_DIRTY))
return;
host_ctxt = &__hyp_this_cpu_ptr(kvm_host_data)->host_ctxt;
host_ctxt = &this_cpu_ptr(&kvm_host_data)->host_ctxt;
guest_ctxt = &vcpu->arch.ctxt;
host_dbg = &vcpu->arch.host_debug_state.regs;
guest_dbg = kern_hyp_va(vcpu->arch.debug_ptr);

15
arch/arm64/kvm/hyp/include/hyp/switch.h
View File

@ -126,11 +126,6 @@ static inline void ___deactivate_traps(struct kvm_vcpu *vcpu)
}
}
static inline void __activate_vm(struct kvm_s2_mmu *mmu)
{
__load_guest_stage2(mmu);
}
static inline bool __translate_far_to_hpfar(u64 far, u64 *hpfar)
{
u64 par, tmp;
@ -377,6 +372,8 @@ static inline bool esr_is_ptrauth_trap(u32 esr)
ctxt_sys_reg(ctxt, key ## KEYHI_EL1) = __val; \
} while(0)
DECLARE_PER_CPU(struct kvm_cpu_context, kvm_hyp_ctxt);
static inline bool __hyp_handle_ptrauth(struct kvm_vcpu *vcpu)
{
struct kvm_cpu_context *ctxt;
@ -386,7 +383,7 @@ static inline bool __hyp_handle_ptrauth(struct kvm_vcpu *vcpu)
!esr_is_ptrauth_trap(kvm_vcpu_get_esr(vcpu)))
return false;
ctxt = &__hyp_this_cpu_ptr(kvm_host_data)->host_ctxt;
ctxt = this_cpu_ptr(&kvm_hyp_ctxt);
__ptrauth_save_key(ctxt, APIA);
__ptrauth_save_key(ctxt, APIB);
__ptrauth_save_key(ctxt, APDA);
@ -481,14 +478,13 @@ static inline bool fixup_guest_exit(struct kvm_vcpu *vcpu, u64 *exit_code)
static inline void __kvm_unexpected_el2_exception(void)
{
extern char __guest_exit_panic[];
unsigned long addr, fixup;
struct kvm_cpu_context *host_ctxt;
struct exception_table_entry *entry, *end;
unsigned long elr_el2 = read_sysreg(elr_el2);
entry = hyp_symbol_addr(__start___kvm_ex_table);
end = hyp_symbol_addr(__stop___kvm_ex_table);
host_ctxt = &__hyp_this_cpu_ptr(kvm_host_data)->host_ctxt;
while (entry < end) {
addr = (unsigned long)&entry->insn + entry->insn;
@ -503,7 +499,8 @@ static inline void __kvm_unexpected_el2_exception(void)
return;
}
hyp_panic(host_ctxt);
/* Trigger a panic after restoring the hyp context. */
write_sysreg(__guest_exit_panic, elr_el2);
}
#endif /* __ARM64_KVM_HYP_SWITCH_H__ */

2
arch/arm64/kvm/hyp/nvhe/.gitignore vendored Normal file
View File

@ -0,0 +1,2 @@
# SPDX-License-Identifier: GPL-2.0-only
hyp.lds

62
arch/arm64/kvm/hyp/nvhe/Makefile
View File

@ -6,44 +6,50 @@
asflags-y := -D__KVM_NVHE_HYPERVISOR__
ccflags-y := -D__KVM_NVHE_HYPERVISOR__
obj-y := timer-sr.o sysreg-sr.o debug-sr.o switch.o tlb.o hyp-init.o
obj-y := timer-sr.o sysreg-sr.o debug-sr.o switch.o tlb.o hyp-init.o host.o hyp-main.o
obj-y += ../vgic-v3-sr.o ../aarch32.o ../vgic-v2-cpuif-proxy.o ../entry.o \
../fpsimd.o ../hyp-entry.o
obj-y := $(patsubst %.o,%.hyp.o,$(obj-y))
extra-y := $(patsubst %.hyp.o,%.hyp.tmp.o,$(obj-y))
##
## Build rules for compiling nVHE hyp code
## Output of this folder is `kvm_nvhe.o`, a partially linked object
## file containing all nVHE hyp code and data.
##
$(obj)/%.hyp.tmp.o: $(src)/%.c FORCE
hyp-obj := $(patsubst %.o,%.nvhe.o,$(obj-y))
obj-y := kvm_nvhe.o
extra-y := $(hyp-obj) kvm_nvhe.tmp.o hyp.lds
# 1) Compile all source files to `.nvhe.o` object files. The file extension
# avoids file name clashes for files shared with VHE.
$(obj)/%.nvhe.o: $(src)/%.c FORCE
$(call if_changed_rule,cc_o_c)
$(obj)/%.hyp.tmp.o: $(src)/%.S FORCE
$(obj)/%.nvhe.o: $(src)/%.S FORCE
$(call if_changed_rule,as_o_S)
$(obj)/%.hyp.o: $(obj)/%.hyp.tmp.o FORCE
# 2) Compile linker script.
$(obj)/hyp.lds: $(src)/hyp.lds.S FORCE
$(call if_changed_dep,cpp_lds_S)
# 3) Partially link all '.nvhe.o' files and apply the linker script.
# Prefixes names of ELF sections with '.hyp', eg. '.hyp.text'.
# Note: The following rule assumes that the 'ld' rule puts LDFLAGS before
# the list of dependencies to form '-T $(obj)/hyp.lds'. This is to
# keep the dependency on the target while avoiding an error from
# GNU ld if the linker script is passed to it twice.
LDFLAGS_kvm_nvhe.tmp.o := -r -T
$(obj)/kvm_nvhe.tmp.o: $(obj)/hyp.lds $(addprefix $(obj)/,$(hyp-obj)) FORCE
$(call if_changed,ld)
# 4) Produce the final 'kvm_nvhe.o', ready to be linked into 'vmlinux'.
# Prefixes names of ELF symbols with '__kvm_nvhe_'.
$(obj)/kvm_nvhe.o: $(obj)/kvm_nvhe.tmp.o FORCE
$(call if_changed,hypcopy)
# Disable reordering functions by GCC (enabled at -O2).
# This pass puts functions into '.text.*' sections to aid the linker
# in optimizing ELF layout. See HYPCOPY comment below for more info.
ccflags-y += $(call cc-option,-fno-reorder-functions)
# The HYPCOPY command uses `objcopy` to prefix all ELF symbol names
# and relevant ELF section names to avoid clashes with VHE code/data.
#
# Hyp code is assumed to be in the '.text' section of the input object
# files (with the exception of specialized sections such as
# '.hyp.idmap.text'). This assumption may be broken by a compiler that
# divides code into sections like '.text.unlikely' so as to optimize
# ELF layout. HYPCOPY checks that no such sections exist in the input
# using `objdump`, otherwise they would be linked together with other
# kernel code and not memory-mapped correctly at runtime.
# to avoid clashes with VHE code/data.
quiet_cmd_hypcopy = HYPCOPY $@
cmd_hypcopy = \
if $(OBJDUMP) -h $< | grep -F '.text.'; then \
echo "$@: function reordering not supported in nVHE hyp code" >&2; \
/bin/false; \
fi; \
$(OBJCOPY) --prefix-symbols=__kvm_nvhe_ \
--rename-section=.text=.hyp.text \
$< $@
cmd_hypcopy = $(OBJCOPY) --prefix-symbols=__kvm_nvhe_ $< $@
# Remove ftrace and Shadow Call Stack CFLAGS.
# This is equivalent to the 'notrace' and '__noscs' annotations.

187
arch/arm64/kvm/hyp/nvhe/host.S Normal file
View File

@ -0,0 +1,187 @@
/* SPDX-License-Identifier: GPL-2.0-only */
/*
* Copyright (C) 2020 - Google Inc
* Author: Andrew Scull <ascull@google.com>
*/
#include <linux/linkage.h>
#include <asm/assembler.h>
#include <asm/kvm_asm.h>
#include <asm/kvm_mmu.h>
.text
SYM_FUNC_START(__host_exit)
stp x0, x1, [sp, #-16]!
get_host_ctxt x0, x1
ALTERNATIVE(nop, SET_PSTATE_PAN(1), ARM64_HAS_PAN, CONFIG_ARM64_PAN)
/* Store the host regs x2 and x3 */
stp x2, x3, [x0, #CPU_XREG_OFFSET(2)]
/* Retrieve the host regs x0-x1 from the stack */
ldp x2, x3, [sp], #16 // x0, x1
/* Store the host regs x0-x1 and x4-x17 */
stp x2, x3, [x0, #CPU_XREG_OFFSET(0)]
stp x4, x5, [x0, #CPU_XREG_OFFSET(4)]
stp x6, x7, [x0, #CPU_XREG_OFFSET(6)]
stp x8, x9, [x0, #CPU_XREG_OFFSET(8)]
stp x10, x11, [x0, #CPU_XREG_OFFSET(10)]
stp x12, x13, [x0, #CPU_XREG_OFFSET(12)]
stp x14, x15, [x0, #CPU_XREG_OFFSET(14)]
stp x16, x17, [x0, #CPU_XREG_OFFSET(16)]
/* Store the host regs x18-x29, lr */
save_callee_saved_regs x0
/* Save the host context pointer in x29 across the function call */
mov x29, x0
bl handle_trap
/* Restore host regs x0-x17 */
ldp x0, x1, [x29, #CPU_XREG_OFFSET(0)]
ldp x2, x3, [x29, #CPU_XREG_OFFSET(2)]
ldp x4, x5, [x29, #CPU_XREG_OFFSET(4)]
ldp x6, x7, [x29, #CPU_XREG_OFFSET(6)]
/* x0-7 are use for panic arguments */
__host_enter_for_panic:
ldp x8, x9, [x29, #CPU_XREG_OFFSET(8)]
ldp x10, x11, [x29, #CPU_XREG_OFFSET(10)]
ldp x12, x13, [x29, #CPU_XREG_OFFSET(12)]
ldp x14, x15, [x29, #CPU_XREG_OFFSET(14)]
ldp x16, x17, [x29, #CPU_XREG_OFFSET(16)]
/* Restore host regs x18-x29, lr */
restore_callee_saved_regs x29
/* Do not touch any register after this! */
__host_enter_without_restoring:
eret
sb
SYM_FUNC_END(__host_exit)
/*
* void __noreturn __hyp_do_panic(bool restore_host, u64 spsr, u64 elr, u64 par);
*/
SYM_FUNC_START(__hyp_do_panic)
/* Load the format arguments into x1-7 */
mov x6, x3
get_vcpu_ptr x7, x3
mrs x3, esr_el2
mrs x4, far_el2
mrs x5, hpfar_el2
/* Prepare and exit to the host's panic funciton. */
mov lr, #(PSR_F_BIT | PSR_I_BIT | PSR_A_BIT | PSR_D_BIT |\
PSR_MODE_EL1h)
msr spsr_el2, lr
ldr lr, =panic
msr elr_el2, lr
/*
* Set the panic format string and enter the host, conditionally
* restoring the host context.
*/
cmp x0, xzr
ldr x0, =__hyp_panic_string
b.eq __host_enter_without_restoring
b __host_enter_for_panic
SYM_FUNC_END(__hyp_do_panic)
.macro host_el1_sync_vect
.align 7
.L__vect_start\@:
stp x0, x1, [sp, #-16]!
mrs x0, esr_el2
lsr x0, x0, #ESR_ELx_EC_SHIFT
cmp x0, #ESR_ELx_EC_HVC64
ldp x0, x1, [sp], #16
b.ne __host_exit
/* Check for a stub HVC call */
cmp x0, #HVC_STUB_HCALL_NR
b.hs __host_exit
/*
* Compute the idmap address of __kvm_handle_stub_hvc and
* jump there. Since we use kimage_voffset, do not use the
* HYP VA for __kvm_handle_stub_hvc, but the kernel VA instead
* (by loading it from the constant pool).
*
* Preserve x0-x4, which may contain stub parameters.
*/
ldr x5, =__kvm_handle_stub_hvc
ldr_l x6, kimage_voffset
/* x5 = __pa(x5) */
sub x5, x5, x6
br x5
.L__vect_end\@:
.if ((.L__vect_end\@ - .L__vect_start\@) > 0x80)
.error "host_el1_sync_vect larger than vector entry"
.endif
.endm
.macro invalid_host_el2_vect
.align 7
/* If a guest is loaded, panic out of it. */
stp x0, x1, [sp, #-16]!
get_loaded_vcpu x0, x1
cbnz x0, __guest_exit_panic
add sp, sp, #16
/*
* The panic may not be clean if the exception is taken before the host
* context has been saved by __host_exit or after the hyp context has
* been partially clobbered by __host_enter.
*/
b hyp_panic
.endm
.macro invalid_host_el1_vect
.align 7
mov x0, xzr /* restore_host = false */
mrs x1, spsr_el2
mrs x2, elr_el2
mrs x3, par_el1
b __hyp_do_panic
.endm
/*
* The host vector does not use an ESB instruction in order to avoid consuming
* SErrors that should only be consumed by the host. Guest entry is deferred by
* __guest_enter if there are any pending asynchronous exceptions so hyp will
* always return to the host without having consumerd host SErrors.
*
* CONFIG_KVM_INDIRECT_VECTORS is not applied to the host vectors because the
* host knows about the EL2 vectors already, and there is no point in hiding
* them.
*/
.align 11
SYM_CODE_START(__kvm_hyp_host_vector)
invalid_host_el2_vect // Synchronous EL2t
invalid_host_el2_vect // IRQ EL2t
invalid_host_el2_vect // FIQ EL2t
invalid_host_el2_vect // Error EL2t
invalid_host_el2_vect // Synchronous EL2h
invalid_host_el2_vect // IRQ EL2h
invalid_host_el2_vect // FIQ EL2h
invalid_host_el2_vect // Error EL2h
host_el1_sync_vect // Synchronous 64-bit EL1
invalid_host_el1_vect // IRQ 64-bit EL1
invalid_host_el1_vect // FIQ 64-bit EL1
invalid_host_el1_vect // Error 64-bit EL1
invalid_host_el1_vect // Synchronous 32-bit EL1
invalid_host_el1_vect // IRQ 32-bit EL1
invalid_host_el1_vect // FIQ 32-bit EL1
invalid_host_el1_vect // Error 32-bit EL1
SYM_CODE_END(__kvm_hyp_host_vector)

71
arch/arm64/kvm/hyp/nvhe/hyp-init.S
View File

@ -4,11 +4,13 @@
* Author: Marc Zyngier <marc.zyngier@arm.com>
*/
#include <linux/arm-smccc.h>
#include <linux/linkage.h>
#include <asm/alternative.h>
#include <asm/assembler.h>
#include <asm/kvm_arm.h>
#include <asm/kvm_asm.h>
#include <asm/kvm_mmu.h>
#include <asm/pgtable-hwdef.h>
#include <asm/sysreg.h>
@ -44,27 +46,37 @@ __invalid:
b .
/*
* x0: HYP pgd
* x1: HYP stack
* x2: HYP vectors
* x3: per-CPU offset
* x0: SMCCC function ID
* x1: HYP pgd
* x2: per-CPU offset
* x3: HYP stack
* x4: HYP vectors
*/
__do_hyp_init:
/* Check for a stub HVC call */
cmp x0, #HVC_STUB_HCALL_NR
b.lo __kvm_handle_stub_hvc
phys_to_ttbr x4, x0
alternative_if ARM64_HAS_CNP
orr x4, x4, #TTBR_CNP_BIT
alternative_else_nop_endif
msr ttbr0_el2, x4
/* Set tpidr_el2 for use by HYP to free a register */
msr tpidr_el2, x2
mrs x4, tcr_el1
mov_q x5, TCR_EL2_MASK
and x4, x4, x5
mov x5, #TCR_EL2_RES1
orr x4, x4, x5
mov x2, #KVM_HOST_SMCCC_FUNC(__kvm_hyp_init)
cmp x0, x2
b.eq 1f
mov x0, #SMCCC_RET_NOT_SUPPORTED
eret
1: phys_to_ttbr x0, x1
alternative_if ARM64_HAS_CNP
orr x0, x0, #TTBR_CNP_BIT
alternative_else_nop_endif
msr ttbr0_el2, x0
mrs x0, tcr_el1
mov_q x1, TCR_EL2_MASK
and x0, x0, x1
mov x1, #TCR_EL2_RES1
orr x0, x0, x1
/*
* The ID map may be configured to use an extended virtual address
@ -80,18 +92,18 @@ alternative_else_nop_endif
*
* So use the same T0SZ value we use for the ID map.
*/
ldr_l x5, idmap_t0sz
bfi x4, x5, TCR_T0SZ_OFFSET, TCR_TxSZ_WIDTH
ldr_l x1, idmap_t0sz
bfi x0, x1, TCR_T0SZ_OFFSET, TCR_TxSZ_WIDTH
/*
* Set the PS bits in TCR_EL2.
*/
tcr_compute_pa_size x4, #TCR_EL2_PS_SHIFT, x5, x6
tcr_compute_pa_size x0, #TCR_EL2_PS_SHIFT, x1, x2
msr tcr_el2, x4
msr tcr_el2, x0
mrs x4, mair_el1
msr mair_el2, x4
mrs x0, mair_el1
msr mair_el2, x0
isb
/* Invalidate the stale TLBs from Bootloader */
@ -103,25 +115,22 @@ alternative_else_nop_endif
* as well as the EE bit on BE. Drop the A flag since the compiler
* is allowed to generate unaligned accesses.
*/
mov_q x4, (SCTLR_EL2_RES1 | (SCTLR_ELx_FLAGS & ~SCTLR_ELx_A))
CPU_BE( orr x4, x4, #SCTLR_ELx_EE)
mov_q x0, (SCTLR_EL2_RES1 | (SCTLR_ELx_FLAGS & ~SCTLR_ELx_A))
CPU_BE( orr x0, x0, #SCTLR_ELx_EE)
alternative_if ARM64_HAS_ADDRESS_AUTH
mov_q x5, (SCTLR_ELx_ENIA | SCTLR_ELx_ENIB | \
mov_q x1, (SCTLR_ELx_ENIA | SCTLR_ELx_ENIB | \
SCTLR_ELx_ENDA | SCTLR_ELx_ENDB)
orr x4, x4, x5
orr x0, x0, x1
alternative_else_nop_endif
msr sctlr_el2, x4
msr sctlr_el2, x0
isb
/* Set the stack and new vectors */
kern_hyp_va x1
mov sp, x1
msr vbar_el2, x2
/* Set tpidr_el2 for use by HYP */
msr tpidr_el2, x3
mov sp, x3
msr vbar_el2, x4
/* Hello, World! */
mov x0, #SMCCC_RET_SUCCESS
eret
SYM_CODE_END(__kvm_hyp_init)

117
arch/arm64/kvm/hyp/nvhe/hyp-main.c Normal file
View File

@ -0,0 +1,117 @@
// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (C) 2020 - Google Inc
* Author: Andrew Scull <ascull@google.com>
*/
#include <hyp/switch.h>
#include <asm/kvm_asm.h>
#include <asm/kvm_emulate.h>
#include <asm/kvm_host.h>
#include <asm/kvm_hyp.h>
#include <asm/kvm_mmu.h>
#include <kvm/arm_hypercalls.h>
static void handle_host_hcall(unsigned long func_id,
struct kvm_cpu_context *host_ctxt)
{
unsigned long ret = 0;
switch (func_id) {
case KVM_HOST_SMCCC_FUNC(__kvm_vcpu_run): {
unsigned long r1 = host_ctxt->regs.regs[1];
struct kvm_vcpu *vcpu = (struct kvm_vcpu *)r1;
ret = __kvm_vcpu_run(kern_hyp_va(vcpu));
break;
}
case KVM_HOST_SMCCC_FUNC(__kvm_flush_vm_context):
__kvm_flush_vm_context();
break;
case KVM_HOST_SMCCC_FUNC(__kvm_tlb_flush_vmid_ipa): {
unsigned long r1 = host_ctxt->regs.regs[1];
struct kvm_s2_mmu *mmu = (struct kvm_s2_mmu *)r1;
phys_addr_t ipa = host_ctxt->regs.regs[2];
int level = host_ctxt->regs.regs[3];
__kvm_tlb_flush_vmid_ipa(kern_hyp_va(mmu), ipa, level);
break;
}
case KVM_HOST_SMCCC_FUNC(__kvm_tlb_flush_vmid): {
unsigned long r1 = host_ctxt->regs.regs[1];
struct kvm_s2_mmu *mmu = (struct kvm_s2_mmu *)r1;
__kvm_tlb_flush_vmid(kern_hyp_va(mmu));
break;
}
case KVM_HOST_SMCCC_FUNC(__kvm_tlb_flush_local_vmid): {
unsigned long r1 = host_ctxt->regs.regs[1];
struct kvm_s2_mmu *mmu = (struct kvm_s2_mmu *)r1;
__kvm_tlb_flush_local_vmid(kern_hyp_va(mmu));
break;
}
case KVM_HOST_SMCCC_FUNC(__kvm_timer_set_cntvoff): {
u64 cntvoff = host_ctxt->regs.regs[1];
__kvm_timer_set_cntvoff(cntvoff);
break;
}
case KVM_HOST_SMCCC_FUNC(__kvm_enable_ssbs):
__kvm_enable_ssbs();
break;
case KVM_HOST_SMCCC_FUNC(__vgic_v3_get_ich_vtr_el2):
ret = __vgic_v3_get_ich_vtr_el2();
break;
case KVM_HOST_SMCCC_FUNC(__vgic_v3_read_vmcr):
ret = __vgic_v3_read_vmcr();
break;
case KVM_HOST_SMCCC_FUNC(__vgic_v3_write_vmcr): {
u32 vmcr = host_ctxt->regs.regs[1];
__vgic_v3_write_vmcr(vmcr);
break;
}
case KVM_HOST_SMCCC_FUNC(__vgic_v3_init_lrs):
__vgic_v3_init_lrs();
break;
case KVM_HOST_SMCCC_FUNC(__kvm_get_mdcr_el2):
ret = __kvm_get_mdcr_el2();
break;
case KVM_HOST_SMCCC_FUNC(__vgic_v3_save_aprs): {
unsigned long r1 = host_ctxt->regs.regs[1];
struct vgic_v3_cpu_if *cpu_if = (struct vgic_v3_cpu_if *)r1;
__vgic_v3_save_aprs(kern_hyp_va(cpu_if));
break;
}
case KVM_HOST_SMCCC_FUNC(__vgic_v3_restore_aprs): {
unsigned long r1 = host_ctxt->regs.regs[1];
struct vgic_v3_cpu_if *cpu_if = (struct vgic_v3_cpu_if *)r1;
__vgic_v3_restore_aprs(kern_hyp_va(cpu_if));
break;
}
default:
/* Invalid host HVC. */
host_ctxt->regs.regs[0] = SMCCC_RET_NOT_SUPPORTED;
return;
}
host_ctxt->regs.regs[0] = SMCCC_RET_SUCCESS;
host_ctxt->regs.regs[1] = ret;
}
void handle_trap(struct kvm_cpu_context *host_ctxt)
{
u64 esr = read_sysreg_el2(SYS_ESR);
unsigned long func_id;
if (ESR_ELx_EC(esr) != ESR_ELx_EC_HVC64)
hyp_panic();
func_id = host_ctxt->regs.regs[0];
handle_host_hcall(func_id, host_ctxt);
}

19
arch/arm64/kvm/hyp/nvhe/hyp.lds.S Normal file
View File

@ -0,0 +1,19 @@
/* SPDX-License-Identifier: GPL-2.0 */
/*
* Copyright (C) 2020 Google LLC.
* Written by David Brazdil <dbrazdil@google.com>
*
* Linker script used for partial linking of nVHE EL2 object files.
*/
#include <asm/hyp_image.h>
#include <asm-generic/vmlinux.lds.h>
#include <asm/cache.h>
#include <asm/memory.h>
SECTIONS {
HYP_SECTION(.text)
HYP_SECTION_NAME(.data..percpu) : {
PERCPU_INPUT(L1_CACHE_BYTES)
}
}

48
arch/arm64/kvm/hyp/nvhe/switch.c
View File

@ -27,6 +27,11 @@
#include <asm/processor.h>
#include <asm/thread_info.h>
/* Non-VHE specific context */
DEFINE_PER_CPU(struct kvm_host_data, kvm_host_data);
DEFINE_PER_CPU(struct kvm_cpu_context, kvm_hyp_ctxt);
DEFINE_PER_CPU(unsigned long, kvm_hyp_vector);
static void __activate_traps(struct kvm_vcpu *vcpu)
{
u64 val;
@ -42,6 +47,7 @@ static void __activate_traps(struct kvm_vcpu *vcpu)
}
write_sysreg(val, cptr_el2);
write_sysreg(__this_cpu_read(kvm_hyp_vector), vbar_el2);
if (cpus_have_final_cap(ARM64_WORKAROUND_SPECULATIVE_AT)) {
struct kvm_cpu_context *ctxt = &vcpu->arch.ctxt;
@ -60,6 +66,7 @@ static void __activate_traps(struct kvm_vcpu *vcpu)
static void __deactivate_traps(struct kvm_vcpu *vcpu)
{
extern char __kvm_hyp_host_vector[];
u64 mdcr_el2;
___deactivate_traps(vcpu);
@ -91,9 +98,10 @@ static void __deactivate_traps(struct kvm_vcpu *vcpu)
write_sysreg(mdcr_el2, mdcr_el2);
write_sysreg(HCR_HOST_NVHE_FLAGS, hcr_el2);
write_sysreg(CPTR_EL2_DEFAULT, cptr_el2);
write_sysreg(__kvm_hyp_host_vector, vbar_el2);
}
static void __deactivate_vm(struct kvm_vcpu *vcpu)
static void __load_host_stage2(void)
{
write_sysreg(0, vttbr_el2);
}
@ -173,9 +181,7 @@ int __kvm_vcpu_run(struct kvm_vcpu *vcpu)
pmr_sync();
}
vcpu = kern_hyp_va(vcpu);
host_ctxt = &__hyp_this_cpu_ptr(kvm_host_data)->host_ctxt;
host_ctxt = &this_cpu_ptr(&kvm_host_data)->host_ctxt;
host_ctxt->__hyp_running_vcpu = vcpu;
guest_ctxt = &vcpu->arch.ctxt;
@ -194,7 +200,7 @@ int __kvm_vcpu_run(struct kvm_vcpu *vcpu)
__sysreg32_restore_state(vcpu);
__sysreg_restore_state_nvhe(guest_ctxt);
__activate_vm(kern_hyp_va(vcpu->arch.hw_mmu));
__load_guest_stage2(kern_hyp_va(vcpu->arch.hw_mmu));
__activate_traps(vcpu);
__hyp_vgic_restore_state(vcpu);
@ -204,7 +210,7 @@ int __kvm_vcpu_run(struct kvm_vcpu *vcpu)
do {
/* Jump in the fire! */
exit_code = __guest_enter(vcpu, host_ctxt);
exit_code = __guest_enter(vcpu);
/* And we're baaack! */
} while (fixup_guest_exit(vcpu, &exit_code));
@ -215,7 +221,7 @@ int __kvm_vcpu_run(struct kvm_vcpu *vcpu)
__hyp_vgic_save_state(vcpu);
__deactivate_traps(vcpu);
__deactivate_vm(vcpu);
__load_host_stage2();
__sysreg_restore_state_nvhe(host_ctxt);
@ -235,35 +241,31 @@ int __kvm_vcpu_run(struct kvm_vcpu *vcpu)
if (system_uses_irq_prio_masking())
gic_write_pmr(GIC_PRIO_IRQOFF);
host_ctxt->__hyp_running_vcpu = NULL;
return exit_code;
}
void __noreturn hyp_panic(struct kvm_cpu_context *host_ctxt)
void __noreturn hyp_panic(void)
{
u64 spsr = read_sysreg_el2(SYS_SPSR);
u64 elr = read_sysreg_el2(SYS_ELR);
u64 par = read_sysreg(par_el1);
struct kvm_vcpu *vcpu = host_ctxt->__hyp_running_vcpu;
unsigned long str_va;
bool restore_host = true;
struct kvm_cpu_context *host_ctxt;
struct kvm_vcpu *vcpu;
if (read_sysreg(vttbr_el2)) {
host_ctxt = &this_cpu_ptr(&kvm_host_data)->host_ctxt;
vcpu = host_ctxt->__hyp_running_vcpu;
if (vcpu) {
__timer_disable_traps(vcpu);
__deactivate_traps(vcpu);
__deactivate_vm(vcpu);
__load_host_stage2();
__sysreg_restore_state_nvhe(host_ctxt);
}
/*
* Force the panic string to be loaded from the literal pool,
* making sure it is a kernel address and not a PC-relative
* reference.
*/
asm volatile("ldr %0, =%1" : "=r" (str_va) : "S" (__hyp_panic_string));
__hyp_do_panic(str_va,
spsr, elr,
read_sysreg(esr_el2), read_sysreg_el2(SYS_FAR),
read_sysreg(hpfar_el2), par, vcpu);
__hyp_do_panic(restore_host, spsr, elr, par);
unreachable();
}

2
arch/arm64/kvm/hyp/nvhe/tlb.c
View File

@ -61,7 +61,6 @@ void __kvm_tlb_flush_vmid_ipa(struct kvm_s2_mmu *mmu,
dsb(ishst);
/* Switch to requested VMID */
mmu = kern_hyp_va(mmu);
__tlb_switch_to_guest(mmu, &cxt);
/*
@ -115,7 +114,6 @@ void __kvm_tlb_flush_vmid(struct kvm_s2_mmu *mmu)
dsb(ishst);
/* Switch to requested VMID */
mmu = kern_hyp_va(mmu);
__tlb_switch_to_guest(mmu, &cxt);
__tlbi(vmalls12e1is);

892
arch/arm64/kvm/hyp/pgtable.c Normal file
View File

@ -0,0 +1,892 @@
// SPDX-License-Identifier: GPL-2.0-only
/*
* Stand-alone page-table allocator for hyp stage-1 and guest stage-2.
* No bombay mix was harmed in the writing of this file.
*
* Copyright (C) 2020 Google LLC
* Author: Will Deacon <will@kernel.org>
*/
#include <linux/bitfield.h>
#include <asm/kvm_pgtable.h>
#define KVM_PGTABLE_MAX_LEVELS 4U
#define KVM_PTE_VALID BIT(0)
#define KVM_PTE_TYPE BIT(1)
#define KVM_PTE_TYPE_BLOCK 0
#define KVM_PTE_TYPE_PAGE 1
#define KVM_PTE_TYPE_TABLE 1
#define KVM_PTE_ADDR_MASK GENMASK(47, PAGE_SHIFT)
#define KVM_PTE_ADDR_51_48 GENMASK(15, 12)
#define KVM_PTE_LEAF_ATTR_LO GENMASK(11, 2)
#define KVM_PTE_LEAF_ATTR_LO_S1_ATTRIDX GENMASK(4, 2)
#define KVM_PTE_LEAF_ATTR_LO_S1_AP GENMASK(7, 6)
#define KVM_PTE_LEAF_ATTR_LO_S1_AP_RO 3
#define KVM_PTE_LEAF_ATTR_LO_S1_AP_RW 1
#define KVM_PTE_LEAF_ATTR_LO_S1_SH GENMASK(9, 8)
#define KVM_PTE_LEAF_ATTR_LO_S1_SH_IS 3
#define KVM_PTE_LEAF_ATTR_LO_S1_AF BIT(10)
#define KVM_PTE_LEAF_ATTR_LO_S2_MEMATTR GENMASK(5, 2)
#define KVM_PTE_LEAF_ATTR_LO_S2_S2AP_R BIT(6)
#define KVM_PTE_LEAF_ATTR_LO_S2_S2AP_W BIT(7)
#define KVM_PTE_LEAF_ATTR_LO_S2_SH GENMASK(9, 8)
#define KVM_PTE_LEAF_ATTR_LO_S2_SH_IS 3
#define KVM_PTE_LEAF_ATTR_LO_S2_AF BIT(10)
#define KVM_PTE_LEAF_ATTR_HI GENMASK(63, 51)
#define KVM_PTE_LEAF_ATTR_HI_S1_XN BIT(54)
#define KVM_PTE_LEAF_ATTR_HI_S2_XN BIT(54)
struct kvm_pgtable_walk_data {
struct kvm_pgtable *pgt;
struct kvm_pgtable_walker *walker;
u64 addr;
u64 end;
};
static u64 kvm_granule_shift(u32 level)
{
/* Assumes KVM_PGTABLE_MAX_LEVELS is 4 */
return ARM64_HW_PGTABLE_LEVEL_SHIFT(level);
}
static u64 kvm_granule_size(u32 level)
{
return BIT(kvm_granule_shift(level));
}
static bool kvm_block_mapping_supported(u64 addr, u64 end, u64 phys, u32 level)
{
u64 granule = kvm_granule_size(level);
/*
* Reject invalid block mappings and don't bother with 4TB mappings for
* 52-bit PAs.
*/
if (level == 0 || (PAGE_SIZE != SZ_4K && level == 1))
return false;
if (granule > (end - addr))
return false;
return IS_ALIGNED(addr, granule) && IS_ALIGNED(phys, granule);
}
static u32 kvm_pgtable_idx(struct kvm_pgtable_walk_data *data, u32 level)
{
u64 shift = kvm_granule_shift(level);
u64 mask = BIT(PAGE_SHIFT - 3) - 1;
return (data->addr >> shift) & mask;
}
static u32 __kvm_pgd_page_idx(struct kvm_pgtable *pgt, u64 addr)
{
u64 shift = kvm_granule_shift(pgt->start_level - 1); /* May underflow */
u64 mask = BIT(pgt->ia_bits) - 1;
return (addr & mask) >> shift;
}
static u32 kvm_pgd_page_idx(struct kvm_pgtable_walk_data *data)
{
return __kvm_pgd_page_idx(data->pgt, data->addr);
}
static u32 kvm_pgd_pages(u32 ia_bits, u32 start_level)
{
struct kvm_pgtable pgt = {
.ia_bits = ia_bits,
.start_level = start_level,
};
return __kvm_pgd_page_idx(&pgt, -1ULL) + 1;
}
static bool kvm_pte_valid(kvm_pte_t pte)
{
return pte & KVM_PTE_VALID;
}
static bool kvm_pte_table(kvm_pte_t pte, u32 level)
{
if (level == KVM_PGTABLE_MAX_LEVELS - 1)
return false;
if (!kvm_pte_valid(pte))
return false;
return FIELD_GET(KVM_PTE_TYPE, pte) == KVM_PTE_TYPE_TABLE;
}
static u64 kvm_pte_to_phys(kvm_pte_t pte)
{
u64 pa = pte & KVM_PTE_ADDR_MASK;
if (PAGE_SHIFT == 16)
pa |= FIELD_GET(KVM_PTE_ADDR_51_48, pte) << 48;
return pa;
}
static kvm_pte_t kvm_phys_to_pte(u64 pa)
{
kvm_pte_t pte = pa & KVM_PTE_ADDR_MASK;
if (PAGE_SHIFT == 16)
pte |= FIELD_PREP(KVM_PTE_ADDR_51_48, pa >> 48);
return pte;
}
static kvm_pte_t *kvm_pte_follow(kvm_pte_t pte)
{
return __va(kvm_pte_to_phys(pte));
}
static void kvm_set_invalid_pte(kvm_pte_t *ptep)
{
kvm_pte_t pte = *ptep;
WRITE_ONCE(*ptep, pte & ~KVM_PTE_VALID);
}
static void kvm_set_table_pte(kvm_pte_t *ptep, kvm_pte_t *childp)
{
kvm_pte_t old = *ptep, pte = kvm_phys_to_pte(__pa(childp));
pte |= FIELD_PREP(KVM_PTE_TYPE, KVM_PTE_TYPE_TABLE);
pte |= KVM_PTE_VALID;
WARN_ON(kvm_pte_valid(old));
smp_store_release(ptep, pte);
}
static bool kvm_set_valid_leaf_pte(kvm_pte_t *ptep, u64 pa, kvm_pte_t attr,
u32 level)
{
kvm_pte_t old = *ptep, pte = kvm_phys_to_pte(pa);
u64 type = (level == KVM_PGTABLE_MAX_LEVELS - 1) ? KVM_PTE_TYPE_PAGE :
KVM_PTE_TYPE_BLOCK;
pte |= attr & (KVM_PTE_LEAF_ATTR_LO | KVM_PTE_LEAF_ATTR_HI);
pte |= FIELD_PREP(KVM_PTE_TYPE, type);
pte |= KVM_PTE_VALID;
/* Tolerate KVM recreating the exact same mapping. */
if (kvm_pte_valid(old))
return old == pte;
smp_store_release(ptep, pte);
return true;
}
static int kvm_pgtable_visitor_cb(struct kvm_pgtable_walk_data *data, u64 addr,
u32 level, kvm_pte_t *ptep,
enum kvm_pgtable_walk_flags flag)
{
struct kvm_pgtable_walker *walker = data->walker;
return walker->cb(addr, data->end, level, ptep, flag, walker->arg);
}
static int __kvm_pgtable_walk(struct kvm_pgtable_walk_data *data,
kvm_pte_t *pgtable, u32 level);
static inline int __kvm_pgtable_visit(struct kvm_pgtable_walk_data *data,
kvm_pte_t *ptep, u32 level)
{
int ret = 0;
u64 addr = data->addr;
kvm_pte_t *childp, pte = *ptep;
bool table = kvm_pte_table(pte, level);
enum kvm_pgtable_walk_flags flags = data->walker->flags;
if (table && (flags & KVM_PGTABLE_WALK_TABLE_PRE)) {
ret = kvm_pgtable_visitor_cb(data, addr, level, ptep,
KVM_PGTABLE_WALK_TABLE_PRE);
}
if (!table && (flags & KVM_PGTABLE_WALK_LEAF)) {
ret = kvm_pgtable_visitor_cb(data, addr, level, ptep,
KVM_PGTABLE_WALK_LEAF);
pte = *ptep;
table = kvm_pte_table(pte, level);
}
if (ret)
goto out;
if (!table) {
data->addr += kvm_granule_size(level);
goto out;
}
childp = kvm_pte_follow(pte);
ret = __kvm_pgtable_walk(data, childp, level + 1);
if (ret)
goto out;
if (flags & KVM_PGTABLE_WALK_TABLE_POST) {
ret = kvm_pgtable_visitor_cb(data, addr, level, ptep,
KVM_PGTABLE_WALK_TABLE_POST);
}
out:
return ret;
}
static int __kvm_pgtable_walk(struct kvm_pgtable_walk_data *data,
kvm_pte_t *pgtable, u32 level)
{
u32 idx;
int ret = 0;
if (WARN_ON_ONCE(level >= KVM_PGTABLE_MAX_LEVELS))
return -EINVAL;
for (idx = kvm_pgtable_idx(data, level); idx < PTRS_PER_PTE; ++idx) {
kvm_pte_t *ptep = &pgtable[idx];
if (data->addr >= data->end)
break;
ret = __kvm_pgtable_visit(data, ptep, level);
if (ret)
break;
}
return ret;
}
static int _kvm_pgtable_walk(struct kvm_pgtable_walk_data *data)
{
u32 idx;
int ret = 0;
struct kvm_pgtable *pgt = data->pgt;
u64 limit = BIT(pgt->ia_bits);
if (data->addr > limit || data->end > limit)
return -ERANGE;
if (!pgt->pgd)
return -EINVAL;
for (idx = kvm_pgd_page_idx(data); data->addr < data->end; ++idx) {
kvm_pte_t *ptep = &pgt->pgd[idx * PTRS_PER_PTE];
ret = __kvm_pgtable_walk(data, ptep, pgt->start_level);
if (ret)
break;
}
return ret;
}
int kvm_pgtable_walk(struct kvm_pgtable *pgt, u64 addr, u64 size,
struct kvm_pgtable_walker *walker)
{
struct kvm_pgtable_walk_data walk_data = {
.pgt = pgt,
.addr = ALIGN_DOWN(addr, PAGE_SIZE),
.end = PAGE_ALIGN(walk_data.addr + size),
.walker = walker,
};
return _kvm_pgtable_walk(&walk_data);
}
struct hyp_map_data {
u64 phys;
kvm_pte_t attr;
};
static int hyp_map_set_prot_attr(enum kvm_pgtable_prot prot,
struct hyp_map_data *data)
{
bool device = prot & KVM_PGTABLE_PROT_DEVICE;
u32 mtype = device ? MT_DEVICE_nGnRE : MT_NORMAL;
kvm_pte_t attr = FIELD_PREP(KVM_PTE_LEAF_ATTR_LO_S1_ATTRIDX, mtype);
u32 sh = KVM_PTE_LEAF_ATTR_LO_S1_SH_IS;
u32 ap = (prot & KVM_PGTABLE_PROT_W) ? KVM_PTE_LEAF_ATTR_LO_S1_AP_RW :
KVM_PTE_LEAF_ATTR_LO_S1_AP_RO;
if (!(prot & KVM_PGTABLE_PROT_R))
return -EINVAL;
if (prot & KVM_PGTABLE_PROT_X) {
if (prot & KVM_PGTABLE_PROT_W)
return -EINVAL;
if (device)
return -EINVAL;
} else {
attr |= KVM_PTE_LEAF_ATTR_HI_S1_XN;
}
attr |= FIELD_PREP(KVM_PTE_LEAF_ATTR_LO_S1_AP, ap);
attr |= FIELD_PREP(KVM_PTE_LEAF_ATTR_LO_S1_SH, sh);
attr |= KVM_PTE_LEAF_ATTR_LO_S1_AF;
data->attr = attr;
return 0;
}
static bool hyp_map_walker_try_leaf(u64 addr, u64 end, u32 level,
kvm_pte_t *ptep, struct hyp_map_data *data)
{
u64 granule = kvm_granule_size(level), phys = data->phys;
if (!kvm_block_mapping_supported(addr, end, phys, level))
return false;
WARN_ON(!kvm_set_valid_leaf_pte(ptep, phys, data->attr, level));
data->phys += granule;
return true;
}
static int hyp_map_walker(u64 addr, u64 end, u32 level, kvm_pte_t *ptep,
enum kvm_pgtable_walk_flags flag, void * const arg)
{
kvm_pte_t *childp;
if (hyp_map_walker_try_leaf(addr, end, level, ptep, arg))
return 0;
if (WARN_ON(level == KVM_PGTABLE_MAX_LEVELS - 1))
return -EINVAL;
childp = (kvm_pte_t *)get_zeroed_page(GFP_KERNEL);
if (!childp)
return -ENOMEM;
kvm_set_table_pte(ptep, childp);
return 0;
}
int kvm_pgtable_hyp_map(struct kvm_pgtable *pgt, u64 addr, u64 size, u64 phys,
enum kvm_pgtable_prot prot)
{
int ret;
struct hyp_map_data map_data = {
.phys = ALIGN_DOWN(phys, PAGE_SIZE),
};
struct kvm_pgtable_walker walker = {
.cb = hyp_map_walker,
.flags = KVM_PGTABLE_WALK_LEAF,
.arg = &map_data,
};
ret = hyp_map_set_prot_attr(prot, &map_data);
if (ret)
return ret;
ret = kvm_pgtable_walk(pgt, addr, size, &walker);
dsb(ishst);
isb();
return ret;
}
int kvm_pgtable_hyp_init(struct kvm_pgtable *pgt, u32 va_bits)
{
u64 levels = ARM64_HW_PGTABLE_LEVELS(va_bits);
pgt->pgd = (kvm_pte_t *)get_zeroed_page(GFP_KERNEL);
if (!pgt->pgd)
return -ENOMEM;
pgt->ia_bits = va_bits;
pgt->start_level = KVM_PGTABLE_MAX_LEVELS - levels;
pgt->mmu = NULL;
return 0;
}
static int hyp_free_walker(u64 addr, u64 end, u32 level, kvm_pte_t *ptep,
enum kvm_pgtable_walk_flags flag, void * const arg)
{
free_page((unsigned long)kvm_pte_follow(*ptep));
return 0;
}
void kvm_pgtable_hyp_destroy(struct kvm_pgtable *pgt)
{
struct kvm_pgtable_walker walker = {
.cb = hyp_free_walker,
.flags = KVM_PGTABLE_WALK_TABLE_POST,
};
WARN_ON(kvm_pgtable_walk(pgt, 0, BIT(pgt->ia_bits), &walker));
free_page((unsigned long)pgt->pgd);
pgt->pgd = NULL;
}
struct stage2_map_data {
u64 phys;
kvm_pte_t attr;
kvm_pte_t *anchor;
struct kvm_s2_mmu *mmu;
struct kvm_mmu_memory_cache *memcache;
};
static int stage2_map_set_prot_attr(enum kvm_pgtable_prot prot,
struct stage2_map_data *data)
{
bool device = prot & KVM_PGTABLE_PROT_DEVICE;
kvm_pte_t attr = device ? PAGE_S2_MEMATTR(DEVICE_nGnRE) :
PAGE_S2_MEMATTR(NORMAL);
u32 sh = KVM_PTE_LEAF_ATTR_LO_S2_SH_IS;
if (!(prot & KVM_PGTABLE_PROT_X))
attr |= KVM_PTE_LEAF_ATTR_HI_S2_XN;
else if (device)
return -EINVAL;
if (prot & KVM_PGTABLE_PROT_R)
attr |= KVM_PTE_LEAF_ATTR_LO_S2_S2AP_R;
if (prot & KVM_PGTABLE_PROT_W)
attr |= KVM_PTE_LEAF_ATTR_LO_S2_S2AP_W;
attr |= FIELD_PREP(KVM_PTE_LEAF_ATTR_LO_S2_SH, sh);
attr |= KVM_PTE_LEAF_ATTR_LO_S2_AF;
data->attr = attr;
return 0;
}
static bool stage2_map_walker_try_leaf(u64 addr, u64 end, u32 level,
kvm_pte_t *ptep,
struct stage2_map_data *data)
{
u64 granule = kvm_granule_size(level), phys = data->phys;
if (!kvm_block_mapping_supported(addr, end, phys, level))
return false;
if (kvm_set_valid_leaf_pte(ptep, phys, data->attr, level))
goto out;
/* There's an existing valid leaf entry, so perform break-before-make */
kvm_set_invalid_pte(ptep);
kvm_call_hyp(__kvm_tlb_flush_vmid_ipa, data->mmu, addr, level);
kvm_set_valid_leaf_pte(ptep, phys, data->attr, level);
out:
data->phys += granule;
return true;
}
static int stage2_map_walk_table_pre(u64 addr, u64 end, u32 level,
kvm_pte_t *ptep,
struct stage2_map_data *data)
{
if (data->anchor)
return 0;
if (!kvm_block_mapping_supported(addr, end, data->phys, level))
return 0;
kvm_set_invalid_pte(ptep);
kvm_call_hyp(__kvm_tlb_flush_vmid_ipa, data->mmu, addr, 0);
data->anchor = ptep;
return 0;
}
static int stage2_map_walk_leaf(u64 addr, u64 end, u32 level, kvm_pte_t *ptep,
struct stage2_map_data *data)
{
kvm_pte_t *childp, pte = *ptep;
struct page *page = virt_to_page(ptep);
if (data->anchor) {
if (kvm_pte_valid(pte))
put_page(page);
return 0;
}
if (stage2_map_walker_try_leaf(addr, end, level, ptep, data))
goto out_get_page;
if (WARN_ON(level == KVM_PGTABLE_MAX_LEVELS - 1))
return -EINVAL;
if (!data->memcache)
return -ENOMEM;
childp = kvm_mmu_memory_cache_alloc(data->memcache);
if (!childp)
return -ENOMEM;
/*
* If we've run into an existing block mapping then replace it with
* a table. Accesses beyond 'end' that fall within the new table
* will be mapped lazily.
*/
if (kvm_pte_valid(pte)) {
kvm_set_invalid_pte(ptep);
kvm_call_hyp(__kvm_tlb_flush_vmid_ipa, data->mmu, addr, level);
put_page(page);
}
kvm_set_table_pte(ptep, childp);
out_get_page:
get_page(page);
return 0;
}
static int stage2_map_walk_table_post(u64 addr, u64 end, u32 level,
kvm_pte_t *ptep,
struct stage2_map_data *data)
{
int ret = 0;
if (!data->anchor)
return 0;
free_page((unsigned long)kvm_pte_follow(*ptep));
put_page(virt_to_page(ptep));
if (data->anchor == ptep) {
data->anchor = NULL;
ret = stage2_map_walk_leaf(addr, end, level, ptep, data);
}
return ret;
}
/*
* This is a little fiddly, as we use all three of the walk flags. The idea
* is that the TABLE_PRE callback runs for table entries on the way down,
* looking for table entries which we could conceivably replace with a
* block entry for this mapping. If it finds one, then it sets the 'anchor'
* field in 'struct stage2_map_data' to point at the table entry, before
* clearing the entry to zero and descending into the now detached table.
*
* The behaviour of the LEAF callback then depends on whether or not the
* anchor has been set. If not, then we're not using a block mapping higher
* up the table and we perform the mapping at the existing leaves instead.
* If, on the other hand, the anchor _is_ set, then we drop references to
* all valid leaves so that the pages beneath the anchor can be freed.
*
* Finally, the TABLE_POST callback does nothing if the anchor has not
* been set, but otherwise frees the page-table pages while walking back up
* the page-table, installing the block entry when it revisits the anchor
* pointer and clearing the anchor to NULL.
*/
static int stage2_map_walker(u64 addr, u64 end, u32 level, kvm_pte_t *ptep,
enum kvm_pgtable_walk_flags flag, void * const arg)
{
struct stage2_map_data *data = arg;
switch (flag) {
case KVM_PGTABLE_WALK_TABLE_PRE:
return stage2_map_walk_table_pre(addr, end, level, ptep, data);
case KVM_PGTABLE_WALK_LEAF:
return stage2_map_walk_leaf(addr, end, level, ptep, data);
case KVM_PGTABLE_WALK_TABLE_POST:
return stage2_map_walk_table_post(addr, end, level, ptep, data);
}
return -EINVAL;
}
int kvm_pgtable_stage2_map(struct kvm_pgtable *pgt, u64 addr, u64 size,
u64 phys, enum kvm_pgtable_prot prot,
struct kvm_mmu_memory_cache *mc)
{
int ret;
struct stage2_map_data map_data = {
.phys = ALIGN_DOWN(phys, PAGE_SIZE),
.mmu = pgt->mmu,
.memcache = mc,
};
struct kvm_pgtable_walker walker = {
.cb = stage2_map_walker,
.flags = KVM_PGTABLE_WALK_TABLE_PRE |
KVM_PGTABLE_WALK_LEAF |
KVM_PGTABLE_WALK_TABLE_POST,
.arg = &map_data,
};
ret = stage2_map_set_prot_attr(prot, &map_data);
if (ret)
return ret;
ret = kvm_pgtable_walk(pgt, addr, size, &walker);
dsb(ishst);
return ret;
}
static void stage2_flush_dcache(void *addr, u64 size)
{
if (cpus_have_const_cap(ARM64_HAS_STAGE2_FWB))
return;
__flush_dcache_area(addr, size);
}
static bool stage2_pte_cacheable(kvm_pte_t pte)
{
u64 memattr = FIELD_GET(KVM_PTE_LEAF_ATTR_LO_S2_MEMATTR, pte);
return memattr == PAGE_S2_MEMATTR(NORMAL);
}
static int stage2_unmap_walker(u64 addr, u64 end, u32 level, kvm_pte_t *ptep,
enum kvm_pgtable_walk_flags flag,
void * const arg)
{
struct kvm_s2_mmu *mmu = arg;
kvm_pte_t pte = *ptep, *childp = NULL;
bool need_flush = false;
if (!kvm_pte_valid(pte))
return 0;
if (kvm_pte_table(pte, level)) {
childp = kvm_pte_follow(pte);
if (page_count(virt_to_page(childp)) != 1)
return 0;
} else if (stage2_pte_cacheable(pte)) {
need_flush = true;
}
/*
* This is similar to the map() path in that we unmap the entire
* block entry and rely on the remaining portions being faulted
* back lazily.
*/
kvm_set_invalid_pte(ptep);
kvm_call_hyp(__kvm_tlb_flush_vmid_ipa, mmu, addr, level);
put_page(virt_to_page(ptep));
if (need_flush) {
stage2_flush_dcache(kvm_pte_follow(pte),
kvm_granule_size(level));
}
if (childp)
free_page((unsigned long)childp);
return 0;
}
int kvm_pgtable_stage2_unmap(struct kvm_pgtable *pgt, u64 addr, u64 size)
{
struct kvm_pgtable_walker walker = {
.cb = stage2_unmap_walker,
.arg = pgt->mmu,
.flags = KVM_PGTABLE_WALK_LEAF | KVM_PGTABLE_WALK_TABLE_POST,
};
return kvm_pgtable_walk(pgt, addr, size, &walker);
}
struct stage2_attr_data {
kvm_pte_t attr_set;
kvm_pte_t attr_clr;
kvm_pte_t pte;
u32 level;
};
static int stage2_attr_walker(u64 addr, u64 end, u32 level, kvm_pte_t *ptep,
enum kvm_pgtable_walk_flags flag,
void * const arg)
{
kvm_pte_t pte = *ptep;
struct stage2_attr_data *data = arg;
if (!kvm_pte_valid(pte))
return 0;
data->level = level;
data->pte = pte;
pte &= ~data->attr_clr;
pte |= data->attr_set;
/*
* We may race with the CPU trying to set the access flag here,
* but worst-case the access flag update gets lost and will be
* set on the next access instead.
*/
if (data->pte != pte)
WRITE_ONCE(*ptep, pte);
return 0;
}
static int stage2_update_leaf_attrs(struct kvm_pgtable *pgt, u64 addr,
u64 size, kvm_pte_t attr_set,
kvm_pte_t attr_clr, kvm_pte_t *orig_pte,
u32 *level)
{
int ret;
kvm_pte_t attr_mask = KVM_PTE_LEAF_ATTR_LO | KVM_PTE_LEAF_ATTR_HI;
struct stage2_attr_data data = {
.attr_set = attr_set & attr_mask,
.attr_clr = attr_clr & attr_mask,
};
struct kvm_pgtable_walker walker = {
.cb = stage2_attr_walker,
.arg = &data,
.flags = KVM_PGTABLE_WALK_LEAF,
};
ret = kvm_pgtable_walk(pgt, addr, size, &walker);
if (ret)
return ret;
if (orig_pte)
*orig_pte = data.pte;
if (level)
*level = data.level;
return 0;
}
int kvm_pgtable_stage2_wrprotect(struct kvm_pgtable *pgt, u64 addr, u64 size)
{
return stage2_update_leaf_attrs(pgt, addr, size, 0,
KVM_PTE_LEAF_ATTR_LO_S2_S2AP_W,
NULL, NULL);
}
kvm_pte_t kvm_pgtable_stage2_mkyoung(struct kvm_pgtable *pgt, u64 addr)
{
kvm_pte_t pte = 0;
stage2_update_leaf_attrs(pgt, addr, 1, KVM_PTE_LEAF_ATTR_LO_S2_AF, 0,
&pte, NULL);
dsb(ishst);
return pte;
}
kvm_pte_t kvm_pgtable_stage2_mkold(struct kvm_pgtable *pgt, u64 addr)
{
kvm_pte_t pte = 0;
stage2_update_leaf_attrs(pgt, addr, 1, 0, KVM_PTE_LEAF_ATTR_LO_S2_AF,
&pte, NULL);
/*
* "But where's the TLBI?!", you scream.
* "Over in the core code", I sigh.
*
* See the '->clear_flush_young()' callback on the KVM mmu notifier.
*/
return pte;
}
bool kvm_pgtable_stage2_is_young(struct kvm_pgtable *pgt, u64 addr)
{
kvm_pte_t pte = 0;
stage2_update_leaf_attrs(pgt, addr, 1, 0, 0, &pte, NULL);
return pte & KVM_PTE_LEAF_ATTR_LO_S2_AF;
}
int kvm_pgtable_stage2_relax_perms(struct kvm_pgtable *pgt, u64 addr,
enum kvm_pgtable_prot prot)
{
int ret;
u32 level;
kvm_pte_t set = 0, clr = 0;
if (prot & KVM_PGTABLE_PROT_R)
set |= KVM_PTE_LEAF_ATTR_LO_S2_S2AP_R;
if (prot & KVM_PGTABLE_PROT_W)
set |= KVM_PTE_LEAF_ATTR_LO_S2_S2AP_W;
if (prot & KVM_PGTABLE_PROT_X)
clr |= KVM_PTE_LEAF_ATTR_HI_S2_XN;
ret = stage2_update_leaf_attrs(pgt, addr, 1, set, clr, NULL, &level);
if (!ret)
kvm_call_hyp(__kvm_tlb_flush_vmid_ipa, pgt->mmu, addr, level);
return ret;
}
static int stage2_flush_walker(u64 addr, u64 end, u32 level, kvm_pte_t *ptep,
enum kvm_pgtable_walk_flags flag,
void * const arg)
{
kvm_pte_t pte = *ptep;
if (!kvm_pte_valid(pte) || !stage2_pte_cacheable(pte))
return 0;
stage2_flush_dcache(kvm_pte_follow(pte), kvm_granule_size(level));
return 0;
}
int kvm_pgtable_stage2_flush(struct kvm_pgtable *pgt, u64 addr, u64 size)
{
struct kvm_pgtable_walker walker = {
.cb = stage2_flush_walker,
.flags = KVM_PGTABLE_WALK_LEAF,
};
if (cpus_have_const_cap(ARM64_HAS_STAGE2_FWB))
return 0;
return kvm_pgtable_walk(pgt, addr, size, &walker);
}
int kvm_pgtable_stage2_init(struct kvm_pgtable *pgt, struct kvm *kvm)
{
size_t pgd_sz;
u64 vtcr = kvm->arch.vtcr;
u32 ia_bits = VTCR_EL2_IPA(vtcr);
u32 sl0 = FIELD_GET(VTCR_EL2_SL0_MASK, vtcr);
u32 start_level = VTCR_EL2_TGRAN_SL0_BASE - sl0;
pgd_sz = kvm_pgd_pages(ia_bits, start_level) * PAGE_SIZE;
pgt->pgd = alloc_pages_exact(pgd_sz, GFP_KERNEL | __GFP_ZERO);
if (!pgt->pgd)
return -ENOMEM;
pgt->ia_bits = ia_bits;
pgt->start_level = start_level;
pgt->mmu = &kvm->arch.mmu;
/* Ensure zeroed PGD pages are visible to the hardware walker */
dsb(ishst);
return 0;
}
static int stage2_free_walker(u64 addr, u64 end, u32 level, kvm_pte_t *ptep,
enum kvm_pgtable_walk_flags flag,
void * const arg)
{
kvm_pte_t pte = *ptep;
if (!kvm_pte_valid(pte))
return 0;
put_page(virt_to_page(ptep));
if (kvm_pte_table(pte, level))
free_page((unsigned long)kvm_pte_follow(pte));
return 0;
}
void kvm_pgtable_stage2_destroy(struct kvm_pgtable *pgt)
{
size_t pgd_sz;
struct kvm_pgtable_walker walker = {
.cb = stage2_free_walker,
.flags = KVM_PGTABLE_WALK_LEAF |
KVM_PGTABLE_WALK_TABLE_POST,
};
WARN_ON(kvm_pgtable_walk(pgt, 0, BIT(pgt->ia_bits), &walker));
pgd_sz = kvm_pgd_pages(pgt->ia_bits, pgt->start_level) * PAGE_SIZE;
free_pages_exact(pgt->pgd, pgd_sz);
pgt->pgd = NULL;
}

31
arch/arm64/kvm/hyp/vhe/switch.c
View File

@ -28,6 +28,11 @@
const char __hyp_panic_string[] = "HYP panic:\nPS:%08llx PC:%016llx ESR:%08llx\nFAR:%016llx HPFAR:%016llx PAR:%016llx\nVCPU:%p\n";
/* VHE specific context */
DEFINE_PER_CPU(struct kvm_host_data, kvm_host_data);
DEFINE_PER_CPU(struct kvm_cpu_context, kvm_hyp_ctxt);
DEFINE_PER_CPU(unsigned long, kvm_hyp_vector);
static void __activate_traps(struct kvm_vcpu *vcpu)
{
u64 val;
@ -59,7 +64,7 @@ static void __activate_traps(struct kvm_vcpu *vcpu)
write_sysreg(val, cpacr_el1);
write_sysreg(kvm_get_hyp_vector(), vbar_el1);
write_sysreg(__this_cpu_read(kvm_hyp_vector), vbar_el1);
}
NOKPROBE_SYMBOL(__activate_traps);
@ -108,7 +113,7 @@ static int __kvm_vcpu_run_vhe(struct kvm_vcpu *vcpu)
struct kvm_cpu_context *guest_ctxt;
u64 exit_code;
host_ctxt = &__hyp_this_cpu_ptr(kvm_host_data)->host_ctxt;
host_ctxt = &this_cpu_ptr(&kvm_host_data)->host_ctxt;
host_ctxt->__hyp_running_vcpu = vcpu;
guest_ctxt = &vcpu->arch.ctxt;
@ -120,12 +125,12 @@ static int __kvm_vcpu_run_vhe(struct kvm_vcpu *vcpu)
* HCR_EL2.TGE.
*
* We have already configured the guest's stage 1 translation in
* kvm_vcpu_load_sysregs_vhe above. We must now call __activate_vm
* before __activate_traps, because __activate_vm configures
* stage 2 translation, and __activate_traps clear HCR_EL2.TGE
* (among other things).
* kvm_vcpu_load_sysregs_vhe above. We must now call
* __load_guest_stage2 before __activate_traps, because
* __load_guest_stage2 configures stage 2 translation, and
* __activate_traps clear HCR_EL2.TGE (among other things).
*/
__activate_vm(vcpu->arch.hw_mmu);
__load_guest_stage2(vcpu->arch.hw_mmu);
__activate_traps(vcpu);
sysreg_restore_guest_state_vhe(guest_ctxt);
@ -133,7 +138,7 @@ static int __kvm_vcpu_run_vhe(struct kvm_vcpu *vcpu)
do {
/* Jump in the fire! */
exit_code = __guest_enter(vcpu, host_ctxt);
exit_code = __guest_enter(vcpu);
/* And we're baaack! */
} while (fixup_guest_exit(vcpu, &exit_code));
@ -188,10 +193,12 @@ int __kvm_vcpu_run(struct kvm_vcpu *vcpu)
return ret;
}
static void __hyp_call_panic(u64 spsr, u64 elr, u64 par,
struct kvm_cpu_context *host_ctxt)
static void __hyp_call_panic(u64 spsr, u64 elr, u64 par)
{
struct kvm_cpu_context *host_ctxt;
struct kvm_vcpu *vcpu;
host_ctxt = &this_cpu_ptr(&kvm_host_data)->host_ctxt;
vcpu = host_ctxt->__hyp_running_vcpu;
__deactivate_traps(vcpu);
@ -204,13 +211,13 @@ static void __hyp_call_panic(u64 spsr, u64 elr, u64 par,
}
NOKPROBE_SYMBOL(__hyp_call_panic);
void __noreturn hyp_panic(struct kvm_cpu_context *host_ctxt)
void __noreturn hyp_panic(void)
{
u64 spsr = read_sysreg_el2(SYS_SPSR);
u64 elr = read_sysreg_el2(SYS_ELR);
u64 par = read_sysreg(par_el1);
__hyp_call_panic(spsr, elr, par, host_ctxt);
__hyp_call_panic(spsr, elr, par);
unreachable();
}

4
arch/arm64/kvm/hyp/vhe/sysreg-sr.c
View File

@ -66,7 +66,7 @@ void kvm_vcpu_load_sysregs_vhe(struct kvm_vcpu *vcpu)
struct kvm_cpu_context *guest_ctxt = &vcpu->arch.ctxt;
struct kvm_cpu_context *host_ctxt;
host_ctxt = &__hyp_this_cpu_ptr(kvm_host_data)->host_ctxt;
host_ctxt = &this_cpu_ptr(&kvm_host_data)->host_ctxt;
__sysreg_save_user_state(host_ctxt);
/*
@ -100,7 +100,7 @@ void kvm_vcpu_put_sysregs_vhe(struct kvm_vcpu *vcpu)
struct kvm_cpu_context *guest_ctxt = &vcpu->arch.ctxt;
struct kvm_cpu_context *host_ctxt;
host_ctxt = &__hyp_this_cpu_ptr(kvm_host_data)->host_ctxt;
host_ctxt = &this_cpu_ptr(&kvm_host_data)->host_ctxt;
deactivate_traps_vhe_put();
__sysreg_save_el1_state(guest_ctxt);

1
arch/arm64/kvm/inject_fault.c
View File

@ -202,6 +202,7 @@ void kvm_inject_pabt(struct kvm_vcpu *vcpu, unsigned long addr)
/**
* kvm_inject_undefined - inject an undefined instruction into the guest
* @vcpu: The vCPU in which to inject the exception
*
* It is assumed that this code is called from the VCPU thread and that the
* VCPU therefore is not currently executing guest code.

1611
arch/arm64/kvm/mmu.c
View File

File diff suppressed because it is too large Load Diff

195
arch/arm64/kvm/pmu-emul.c
View File

@ -20,6 +20,21 @@ static void kvm_pmu_stop_counter(struct kvm_vcpu *vcpu, struct kvm_pmc *pmc);
#define PERF_ATTR_CFG1_KVM_PMU_CHAINED 0x1
static u32 kvm_pmu_event_mask(struct kvm *kvm)
{
switch (kvm->arch.pmuver) {
case 1: /* ARMv8.0 */
return GENMASK(9, 0);
case 4: /* ARMv8.1 */
case 5: /* ARMv8.4 */
case 6: /* ARMv8.5 */
return GENMASK(15, 0);
default: /* Shouldn't be here, just for sanity */
WARN_ONCE(1, "Unknown PMU version %d\n", kvm->arch.pmuver);
return 0;
}
}
/**
* kvm_pmu_idx_is_64bit - determine if select_idx is a 64bit counter
* @vcpu: The vcpu pointer
@ -100,7 +115,7 @@ static bool kvm_pmu_idx_has_chain_evtype(struct kvm_vcpu *vcpu, u64 select_idx)
return false;
reg = PMEVTYPER0_EL0 + select_idx;
eventsel = __vcpu_sys_reg(vcpu, reg) & ARMV8_PMU_EVTYPE_EVENT;
eventsel = __vcpu_sys_reg(vcpu, reg) & kvm_pmu_event_mask(vcpu->kvm);
return eventsel == ARMV8_PMUV3_PERFCTR_CHAIN;
}
@ -516,7 +531,7 @@ void kvm_pmu_software_increment(struct kvm_vcpu *vcpu, u64 val)
/* PMSWINC only applies to ... SW_INC! */
type = __vcpu_sys_reg(vcpu, PMEVTYPER0_EL0 + i);
type &= ARMV8_PMU_EVTYPE_EVENT;
type &= kvm_pmu_event_mask(vcpu->kvm);
if (type != ARMV8_PMUV3_PERFCTR_SW_INCR)
continue;
@ -599,11 +614,21 @@ static void kvm_pmu_create_perf_event(struct kvm_vcpu *vcpu, u64 select_idx)
data = __vcpu_sys_reg(vcpu, reg);
kvm_pmu_stop_counter(vcpu, pmc);
eventsel = data & ARMV8_PMU_EVTYPE_EVENT;
if (pmc->idx == ARMV8_PMU_CYCLE_IDX)
eventsel = ARMV8_PMUV3_PERFCTR_CPU_CYCLES;
else
eventsel = data & kvm_pmu_event_mask(vcpu->kvm);
/* Software increment event does't need to be backed by a perf event */
if (eventsel == ARMV8_PMUV3_PERFCTR_SW_INCR &&
pmc->idx != ARMV8_PMU_CYCLE_IDX)
/* Software increment event doesn't need to be backed by a perf event */
if (eventsel == ARMV8_PMUV3_PERFCTR_SW_INCR)
return;
/*
* If we have a filter in place and that the event isn't allowed, do
* not install a perf event either.
*/
if (vcpu->kvm->arch.pmu_filter &&
!test_bit(eventsel, vcpu->kvm->arch.pmu_filter))
return;
memset(&attr, 0, sizeof(struct perf_event_attr));
@ -615,8 +640,7 @@ static void kvm_pmu_create_perf_event(struct kvm_vcpu *vcpu, u64 select_idx)
attr.exclude_kernel = data & ARMV8_PMU_EXCLUDE_EL1 ? 1 : 0;
attr.exclude_hv = 1; /* Don't count EL2 events */
attr.exclude_host = 1; /* Don't count host events */
attr.config = (pmc->idx == ARMV8_PMU_CYCLE_IDX) ?
ARMV8_PMUV3_PERFCTR_CPU_CYCLES : eventsel;
attr.config = eventsel;
counter = kvm_pmu_get_pair_counter_value(vcpu, pmc);
@ -700,17 +724,95 @@ static void kvm_pmu_update_pmc_chained(struct kvm_vcpu *vcpu, u64 select_idx)
void kvm_pmu_set_counter_event_type(struct kvm_vcpu *vcpu, u64 data,
u64 select_idx)
{
u64 reg, event_type = data & ARMV8_PMU_EVTYPE_MASK;
u64 reg, mask;
mask = ARMV8_PMU_EVTYPE_MASK;
mask &= ~ARMV8_PMU_EVTYPE_EVENT;
mask |= kvm_pmu_event_mask(vcpu->kvm);
reg = (select_idx == ARMV8_PMU_CYCLE_IDX)
? PMCCFILTR_EL0 : PMEVTYPER0_EL0 + select_idx;
__vcpu_sys_reg(vcpu, reg) = event_type;
__vcpu_sys_reg(vcpu, reg) = data & mask;
kvm_pmu_update_pmc_chained(vcpu, select_idx);
kvm_pmu_create_perf_event(vcpu, select_idx);
}
static int kvm_pmu_probe_pmuver(void)
{
struct perf_event_attr attr = { };
struct perf_event *event;
struct arm_pmu *pmu;
int pmuver = 0xf;
/*
* Create a dummy event that only counts user cycles. As we'll never
* leave this function with the event being live, it will never
* count anything. But it allows us to probe some of the PMU
* details. Yes, this is terrible.
*/
attr.type = PERF_TYPE_RAW;
attr.size = sizeof(attr);
attr.pinned = 1;
attr.disabled = 0;
attr.exclude_user = 0;
attr.exclude_kernel = 1;
attr.exclude_hv = 1;
attr.exclude_host = 1;
attr.config = ARMV8_PMUV3_PERFCTR_CPU_CYCLES;
attr.sample_period = GENMASK(63, 0);
event = perf_event_create_kernel_counter(&attr, -1, current,
kvm_pmu_perf_overflow, &attr);
if (IS_ERR(event)) {
pr_err_once("kvm: pmu event creation failed %ld\n",
PTR_ERR(event));
return 0xf;
}
if (event->pmu) {
pmu = to_arm_pmu(event->pmu);
if (pmu->pmuver)
pmuver = pmu->pmuver;
}
perf_event_disable(event);
perf_event_release_kernel(event);
return pmuver;
}
u64 kvm_pmu_get_pmceid(struct kvm_vcpu *vcpu, bool pmceid1)
{
unsigned long *bmap = vcpu->kvm->arch.pmu_filter;
u64 val, mask = 0;
int base, i;
if (!pmceid1) {
val = read_sysreg(pmceid0_el0);
base = 0;
} else {
val = read_sysreg(pmceid1_el0);
base = 32;
}
if (!bmap)
return val;
for (i = 0; i < 32; i += 8) {
u64 byte;
byte = bitmap_get_value8(bmap, base + i);
mask |= byte << i;
byte = bitmap_get_value8(bmap, 0x4000 + base + i);
mask |= byte << (32 + i);
}
return val & mask;
}
bool kvm_arm_support_pmu_v3(void)
{
/*
@ -756,15 +858,6 @@ int kvm_arm_pmu_v3_enable(struct kvm_vcpu *vcpu)
static int kvm_arm_pmu_v3_init(struct kvm_vcpu *vcpu)
{
if (!kvm_arm_support_pmu_v3())
return -ENODEV;
if (!test_bit(KVM_ARM_VCPU_PMU_V3, vcpu->arch.features))
return -ENXIO;
if (vcpu->arch.pmu.created)
return -EBUSY;
if (irqchip_in_kernel(vcpu->kvm)) {
int ret;
@ -820,6 +913,19 @@ static bool pmu_irq_is_valid(struct kvm *kvm, int irq)
int kvm_arm_pmu_v3_set_attr(struct kvm_vcpu *vcpu, struct kvm_device_attr *attr)
{
if (!kvm_arm_support_pmu_v3() ||
!test_bit(KVM_ARM_VCPU_PMU_V3, vcpu->arch.features))
return -ENODEV;
if (vcpu->arch.pmu.created)
return -EBUSY;
if (!vcpu->kvm->arch.pmuver)
vcpu->kvm->arch.pmuver = kvm_pmu_probe_pmuver();
if (vcpu->kvm->arch.pmuver == 0xf)
return -ENODEV;
switch (attr->attr) {
case KVM_ARM_VCPU_PMU_V3_IRQ: {
int __user *uaddr = (int __user *)(long)attr->addr;
@ -828,9 +934,6 @@ int kvm_arm_pmu_v3_set_attr(struct kvm_vcpu *vcpu, struct kvm_device_attr *attr)
if (!irqchip_in_kernel(vcpu->kvm))
return -EINVAL;
if (!test_bit(KVM_ARM_VCPU_PMU_V3, vcpu->arch.features))
return -ENODEV;
if (get_user(irq, uaddr))
return -EFAULT;
@ -848,6 +951,53 @@ int kvm_arm_pmu_v3_set_attr(struct kvm_vcpu *vcpu, struct kvm_device_attr *attr)
vcpu->arch.pmu.irq_num = irq;
return 0;
}
case KVM_ARM_VCPU_PMU_V3_FILTER: {
struct kvm_pmu_event_filter __user *uaddr;
struct kvm_pmu_event_filter filter;
int nr_events;
nr_events = kvm_pmu_event_mask(vcpu->kvm) + 1;
uaddr = (struct kvm_pmu_event_filter __user *)(long)attr->addr;
if (copy_from_user(&filter, uaddr, sizeof(filter)))
return -EFAULT;
if (((u32)filter.base_event + filter.nevents) > nr_events ||
(filter.action != KVM_PMU_EVENT_ALLOW &&
filter.action != KVM_PMU_EVENT_DENY))
return -EINVAL;
mutex_lock(&vcpu->kvm->lock);
if (!vcpu->kvm->arch.pmu_filter) {
vcpu->kvm->arch.pmu_filter = bitmap_alloc(nr_events, GFP_KERNEL);
if (!vcpu->kvm->arch.pmu_filter) {
mutex_unlock(&vcpu->kvm->lock);
return -ENOMEM;
}
/*
* The default depends on the first applied filter.
* If it allows events, the default is to deny.
* Conversely, if the first filter denies a set of
* events, the default is to allow.
*/
if (filter.action == KVM_PMU_EVENT_ALLOW)
bitmap_zero(vcpu->kvm->arch.pmu_filter, nr_events);
else
bitmap_fill(vcpu->kvm->arch.pmu_filter, nr_events);
}
if (filter.action == KVM_PMU_EVENT_ALLOW)
bitmap_set(vcpu->kvm->arch.pmu_filter, filter.base_event, filter.nevents);
else
bitmap_clear(vcpu->kvm->arch.pmu_filter, filter.base_event, filter.nevents);
mutex_unlock(&vcpu->kvm->lock);
return 0;
}
case KVM_ARM_VCPU_PMU_V3_INIT:
return kvm_arm_pmu_v3_init(vcpu);
}
@ -884,6 +1034,7 @@ int kvm_arm_pmu_v3_has_attr(struct kvm_vcpu *vcpu, struct kvm_device_attr *attr)
switch (attr->attr) {
case KVM_ARM_VCPU_PMU_V3_IRQ:
case KVM_ARM_VCPU_PMU_V3_INIT:
case KVM_ARM_VCPU_PMU_V3_FILTER:
if (kvm_arm_support_pmu_v3() &&
test_bit(KVM_ARM_VCPU_PMU_V3, vcpu->arch.features))
return 0;

13
arch/arm64/kvm/pmu.c
View File

@ -31,9 +31,9 @@ static bool kvm_pmu_switch_needed(struct perf_event_attr *attr)
*/
void kvm_set_pmu_events(u32 set, struct perf_event_attr *attr)
{
struct kvm_host_data *ctx = this_cpu_ptr(&kvm_host_data);
struct kvm_host_data *ctx = this_cpu_ptr_hyp_sym(kvm_host_data);
if (!kvm_pmu_switch_needed(attr))
if (!ctx || !kvm_pmu_switch_needed(attr))
return;
if (!attr->exclude_host)
@ -47,7 +47,10 @@ void kvm_set_pmu_events(u32 set, struct perf_event_attr *attr)
*/
void kvm_clr_pmu_events(u32 clr)
{
struct kvm_host_data *ctx = this_cpu_ptr(&kvm_host_data);
struct kvm_host_data *ctx = this_cpu_ptr_hyp_sym(kvm_host_data);
if (!ctx)
return;
ctx->pmu_events.events_host &= ~clr;
ctx->pmu_events.events_guest &= ~clr;
@ -173,7 +176,7 @@ void kvm_vcpu_pmu_restore_guest(struct kvm_vcpu *vcpu)
return;
preempt_disable();
host = this_cpu_ptr(&kvm_host_data);
host = this_cpu_ptr_hyp_sym(kvm_host_data);
events_guest = host->pmu_events.events_guest;
events_host = host->pmu_events.events_host;
@ -193,7 +196,7 @@ void kvm_vcpu_pmu_restore_host(struct kvm_vcpu *vcpu)
if (!has_vhe())
return;
host = this_cpu_ptr(&kvm_host_data);
host = this_cpu_ptr_hyp_sym(kvm_host_data);
events_guest = host->pmu_events.events_guest;
events_host = host->pmu_events.events_host;

40
arch/arm64/kvm/reset.c
View File

@ -335,7 +335,7 @@ u32 get_kvm_ipa_limit(void)
int kvm_set_ipa_limit(void)
{
unsigned int ipa_max, pa_max, va_max, parange, tgran_2;
unsigned int parange, tgran_2;
u64 mmfr0;
mmfr0 = read_sanitised_ftr_reg(SYS_ID_AA64MMFR0_EL1);
@ -372,39 +372,11 @@ int kvm_set_ipa_limit(void)
break;
}
pa_max = id_aa64mmfr0_parange_to_phys_shift(parange);
/* Clamp the IPA limit to the PA size supported by the kernel */
ipa_max = (pa_max > PHYS_MASK_SHIFT) ? PHYS_MASK_SHIFT : pa_max;
/*
* Since our stage2 table is dependent on the stage1 page table code,
* we must always honor the following condition:
*
* Number of levels in Stage1 >= Number of levels in Stage2.
*
* So clamp the ipa limit further down to limit the number of levels.
* Since we can concatenate upto 16 tables at entry level, we could
* go upto 4bits above the maximum VA addressable with the current
* number of levels.
*/
va_max = PGDIR_SHIFT + PAGE_SHIFT - 3;
va_max += 4;
if (va_max < ipa_max)
ipa_max = va_max;
/*
* If the final limit is lower than the real physical address
* limit of the CPUs, report the reason.
*/
if (ipa_max < pa_max)
pr_info("kvm: Limiting the IPA size due to kernel %s Address limit\n",
(va_max < pa_max) ? "Virtual" : "Physical");
WARN(ipa_max < KVM_PHYS_SHIFT,
"KVM IPA limit (%d bit) is smaller than default size\n", ipa_max);
kvm_ipa_limit = ipa_max;
kvm_info("IPA Size Limit: %dbits\n", kvm_ipa_limit);
kvm_ipa_limit = id_aa64mmfr0_parange_to_phys_shift(parange);
WARN(kvm_ipa_limit < KVM_PHYS_SHIFT,
"KVM IPA Size Limit (%d bits) is smaller than default size\n",
kvm_ipa_limit);
kvm_info("IPA Size Limit: %d bits\n", kvm_ipa_limit);
return 0;
}

5
arch/arm64/kvm/sys_regs.c
View File

@ -769,10 +769,7 @@ static bool access_pmceid(struct kvm_vcpu *vcpu, struct sys_reg_params *p,
if (pmu_access_el0_disabled(vcpu))
return false;
if (!(p->Op2 & 1))
pmceid = read_sysreg(pmceid0_el0);
else
pmceid = read_sysreg(pmceid1_el0);
pmceid = kvm_pmu_get_pmceid(vcpu, (p->Op2 & 1));
p->regval = pmceid;

24
arch/arm64/kvm/vgic/vgic-debug.c
View File

@ -260,34 +260,14 @@ static int vgic_debug_show(struct seq_file *s, void *v)
return 0;
}
static const struct seq_operations vgic_debug_seq_ops = {
static const struct seq_operations vgic_debug_sops = {
.start = vgic_debug_start,
.next = vgic_debug_next,
.stop = vgic_debug_stop,
.show = vgic_debug_show
};
static int debug_open(struct inode *inode, struct file *file)
{
int ret;
ret = seq_open(file, &vgic_debug_seq_ops);
if (!ret) {
struct seq_file *seq;
/* seq_open will have modified file->private_data */
seq = file->private_data;
seq->private = inode->i_private;
}
return ret;
};
static const struct file_operations vgic_debug_fops = {
.owner = THIS_MODULE,
.open = debug_open,
.read = seq_read,
.llseek = seq_lseek,
.release = seq_release
};
DEFINE_SEQ_ATTRIBUTE(vgic_debug);
void vgic_debug_init(struct kvm *kvm)
{

4
arch/arm64/kvm/vgic/vgic-v3.c
View File

@ -662,7 +662,7 @@ void vgic_v3_load(struct kvm_vcpu *vcpu)
if (likely(cpu_if->vgic_sre))
kvm_call_hyp(__vgic_v3_write_vmcr, cpu_if->vgic_vmcr);
kvm_call_hyp(__vgic_v3_restore_aprs, kern_hyp_va(cpu_if));
kvm_call_hyp(__vgic_v3_restore_aprs, cpu_if);
if (has_vhe())
__vgic_v3_activate_traps(cpu_if);
@ -686,7 +686,7 @@ void vgic_v3_put(struct kvm_vcpu *vcpu)
vgic_v3_vmcr_sync(vcpu);
kvm_call_hyp(__vgic_v3_save_aprs, kern_hyp_va(cpu_if));
kvm_call_hyp(__vgic_v3_save_aprs, cpu_if);
if (has_vhe())
__vgic_v3_deactivate_traps(cpu_if);

4
arch/mips/include/asm/kvm_host.h
View File

@ -341,7 +341,7 @@ struct kvm_mips_tlb {
#define KVM_MIPS_GUEST_TLB_SIZE 64
struct kvm_vcpu_arch {
void *guest_ebase;
int (*vcpu_run)(struct kvm_run *run, struct kvm_vcpu *vcpu);
int (*vcpu_run)(struct kvm_vcpu *vcpu);
/* Host registers preserved across guest mode execution */
unsigned long host_stack;
@ -852,7 +852,7 @@ int kvm_mips_emulation_init(struct kvm_mips_callbacks **install_callbacks);
/* Debug: dump vcpu state */
int kvm_arch_vcpu_dump_regs(struct kvm_vcpu *vcpu);
extern int kvm_mips_handle_exit(struct kvm_run *run, struct kvm_vcpu *vcpu);
extern int kvm_mips_handle_exit(struct kvm_vcpu *vcpu);
/* Building of entry/exception code */
int kvm_mips_entry_setup(void);

21
arch/mips/kvm/entry.c
View File

@ -205,7 +205,7 @@ static inline void build_set_exc_base(u32 **p, unsigned int reg)
* Assemble the start of the vcpu_run function to run a guest VCPU. The function
* conforms to the following prototype:
*
* int vcpu_run(struct kvm_run *run, struct kvm_vcpu *vcpu);
* int vcpu_run(struct kvm_vcpu *vcpu);
*
* The exit from the guest and return to the caller is handled by the code
* generated by kvm_mips_build_ret_to_host().
@ -218,8 +218,7 @@ void *kvm_mips_build_vcpu_run(void *addr)
unsigned int i;
/*
* A0: run
* A1: vcpu
* A0: vcpu
*/
/* k0/k1 not being used in host kernel context */
@ -238,10 +237,10 @@ void *kvm_mips_build_vcpu_run(void *addr)
kvm_mips_build_save_scratch(&p, V1, K1);
/* VCPU scratch register has pointer to vcpu */
UASM_i_MTC0(&p, A1, scratch_vcpu[0], scratch_vcpu[1]);
UASM_i_MTC0(&p, A0, scratch_vcpu[0], scratch_vcpu[1]);
/* Offset into vcpu->arch */
UASM_i_ADDIU(&p, K1, A1, offsetof(struct kvm_vcpu, arch));
UASM_i_ADDIU(&p, K1, A0, offsetof(struct kvm_vcpu, arch));
/*
* Save the host stack to VCPU, used for exception processing
@ -645,10 +644,7 @@ void *kvm_mips_build_exit(void *addr)
/* Now that context has been saved, we can use other registers */
/* Restore vcpu */
UASM_i_MFC0(&p, S1, scratch_vcpu[0], scratch_vcpu[1]);
/* Restore run (vcpu->run) */
UASM_i_LW(&p, S0, offsetof(struct kvm_vcpu, run), S1);
UASM_i_MFC0(&p, S0, scratch_vcpu[0], scratch_vcpu[1]);
/*
* Save Host level EPC, BadVaddr and Cause to VCPU, useful to process
@ -810,7 +806,6 @@ void *kvm_mips_build_exit(void *addr)
* with this in the kernel
*/
uasm_i_move(&p, A0, S0);
uasm_i_move(&p, A1, S1);
UASM_i_LA(&p, T9, (unsigned long)kvm_mips_handle_exit);
uasm_i_jalr(&p, RA, T9);
UASM_i_ADDIU(&p, SP, SP, -CALLFRAME_SIZ);
@ -852,7 +847,7 @@ static void *kvm_mips_build_ret_from_exit(void *addr)
* guest, reload k1
*/
uasm_i_move(&p, K1, S1);
uasm_i_move(&p, K1, S0);
UASM_i_ADDIU(&p, K1, K1, offsetof(struct kvm_vcpu, arch));
/*
@ -886,8 +881,8 @@ static void *kvm_mips_build_ret_to_guest(void *addr)
{
u32 *p = addr;
/* Put the saved pointer to vcpu (s1) back into the scratch register */
UASM_i_MTC0(&p, S1, scratch_vcpu[0], scratch_vcpu[1]);
/* Put the saved pointer to vcpu (s0) back into the scratch register */
UASM_i_MTC0(&p, S0, scratch_vcpu[0], scratch_vcpu[1]);
/* Load up the Guest EBASE to minimize the window where BEV is set */
UASM_i_LW(&p, T0, offsetof(struct kvm_vcpu_arch, guest_ebase), K1);

3
arch/mips/kvm/mips.c
View File

@ -1199,8 +1199,9 @@ static void kvm_mips_set_c0_status(void)
/*
* Return value is in the form (errcode<<2 | RESUME_FLAG_HOST | RESUME_FLAG_NV)
*/
int kvm_mips_handle_exit(struct kvm_run *run, struct kvm_vcpu *vcpu)
int kvm_mips_handle_exit(struct kvm_vcpu *vcpu)
{
struct kvm_run *run = vcpu->run;
u32 cause = vcpu->arch.host_cp0_cause;
u32 exccode = (cause >> CAUSEB_EXCCODE) & 0x1f;
u32 __user *opc = (u32 __user *) vcpu->arch.pc;

2
arch/mips/kvm/trap_emul.c
View File

@ -1241,7 +1241,7 @@ static int kvm_trap_emul_vcpu_run(struct kvm_vcpu *vcpu)
*/
kvm_mips_suspend_mm(cpu);
r = vcpu->arch.vcpu_run(vcpu->run, vcpu);
r = vcpu->arch.vcpu_run(vcpu);
/* We may have migrated while handling guest exits */
cpu = smp_processor_id();

2
arch/mips/kvm/vz.c
View File

@ -3266,7 +3266,7 @@ static int kvm_vz_vcpu_run(struct kvm_vcpu *vcpu)
kvm_vz_vcpu_load_tlb(vcpu, cpu);
kvm_vz_vcpu_load_wired(vcpu);
r = vcpu->arch.vcpu_run(vcpu->run, vcpu);
r = vcpu->arch.vcpu_run(vcpu);
kvm_vz_vcpu_save_wired(vcpu);

1
arch/powerpc/include/asm/kvm_host.h
View File

@ -326,6 +326,7 @@ struct kvm_arch {
#endif
#ifdef CONFIG_KVM_XICS
struct kvmppc_xics *xics;
struct kvmppc_xics *xics_device;
struct kvmppc_xive *xive; /* Current XIVE device in use */
struct {
struct kvmppc_xive *native;

8
arch/powerpc/kvm/book3s.c
View File

@ -558,12 +558,12 @@ int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
{
return -ENOTSUPP;
return -EOPNOTSUPP;
}
int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
{
return -ENOTSUPP;
return -EOPNOTSUPP;
}
int kvmppc_get_one_reg(struct kvm_vcpu *vcpu, u64 id,
@ -879,13 +879,15 @@ void kvmppc_core_destroy_vm(struct kvm *kvm)
#ifdef CONFIG_KVM_XICS
/*
* Free the XIVE devices which are not directly freed by the
* Free the XIVE and XICS devices which are not directly freed by the
* device 'release' method
*/
kfree(kvm->arch.xive_devices.native);
kvm->arch.xive_devices.native = NULL;
kfree(kvm->arch.xive_devices.xics_on_xive);
kvm->arch.xive_devices.xics_on_xive = NULL;
kfree(kvm->arch.xics_device);
kvm->arch.xics_device = NULL;
#endif /* CONFIG_KVM_XICS */
}

2
arch/powerpc/kvm/book3s_64_mmu_radix.c
View File

@ -347,7 +347,7 @@ static unsigned long kvmppc_radix_update_pte(struct kvm *kvm, pte_t *ptep,
return __radix_pte_update(ptep, clr, set);
}
void kvmppc_radix_set_pte_at(struct kvm *kvm, unsigned long addr,
static void kvmppc_radix_set_pte_at(struct kvm *kvm, unsigned long addr,
pte_t *ptep, pte_t pte)
{
radix__set_pte_at(kvm->mm, addr, ptep, pte, 0);

4
arch/powerpc/kvm/book3s_64_vio.c
View File

@ -283,7 +283,7 @@ long kvm_vm_ioctl_create_spapr_tce(struct kvm *kvm,
struct kvmppc_spapr_tce_table *siter;
struct mm_struct *mm = kvm->mm;
unsigned long npages, size = args->size;
int ret = -ENOMEM;
int ret;
if (!args->size || args->page_shift < 12 || args->page_shift > 34 ||
(args->offset + args->size > (ULLONG_MAX >> args->page_shift)))
@ -489,7 +489,7 @@ static long kvmppc_tce_iommu_unmap(struct kvm *kvm,
return ret;
}
long kvmppc_tce_iommu_do_map(struct kvm *kvm, struct iommu_table *tbl,
static long kvmppc_tce_iommu_do_map(struct kvm *kvm, struct iommu_table *tbl,
unsigned long entry, unsigned long ua,
enum dma_data_direction dir)
{

2
arch/powerpc/kvm/book3s_64_vio_hv.c
View File

@ -237,7 +237,7 @@ static long iommu_tce_xchg_no_kill_rm(struct mm_struct *mm,
return ret;
}
extern void iommu_tce_kill_rm(struct iommu_table *tbl,
static void iommu_tce_kill_rm(struct iommu_table *tbl,
unsigned long entry, unsigned long pages)
{
if (tbl->it_ops->tce_kill)

24
arch/powerpc/kvm/book3s_hv.c
View File

@ -111,7 +111,7 @@ module_param(one_vm_per_core, bool, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(one_vm_per_core, "Only run vCPUs from the same VM on a core (requires indep_threads_mode=N)");
#ifdef CONFIG_KVM_XICS
static struct kernel_param_ops module_param_ops = {
static const struct kernel_param_ops module_param_ops = {
.set = param_set_int,
.get = param_get_int,
};
@ -3442,9 +3442,19 @@ static int kvmhv_load_hv_regs_and_go(struct kvm_vcpu *vcpu, u64 time_limit,
unsigned long host_psscr = mfspr(SPRN_PSSCR);
unsigned long host_pidr = mfspr(SPRN_PID);
/*
* P8 and P9 suppress the HDEC exception when LPCR[HDICE] = 0,
* so set HDICE before writing HDEC.
*/
mtspr(SPRN_LPCR, vcpu->kvm->arch.host_lpcr | LPCR_HDICE);
isync();
hdec = time_limit - mftb();
if (hdec < 0)
if (hdec < 0) {
mtspr(SPRN_LPCR, vcpu->kvm->arch.host_lpcr);
isync();
return BOOK3S_INTERRUPT_HV_DECREMENTER;
}
mtspr(SPRN_HDEC, hdec);
if (vc->tb_offset) {
@ -3565,7 +3575,7 @@ static int kvmhv_load_hv_regs_and_go(struct kvm_vcpu *vcpu, u64 time_limit,
* Virtual-mode guest entry for POWER9 and later when the host and
* guest are both using the radix MMU. The LPIDR has already been set.
*/
int kvmhv_p9_guest_entry(struct kvm_vcpu *vcpu, u64 time_limit,
static int kvmhv_p9_guest_entry(struct kvm_vcpu *vcpu, u64 time_limit,
unsigned long lpcr)
{
struct kvmppc_vcore *vc = vcpu->arch.vcore;
@ -3579,7 +3589,7 @@ int kvmhv_p9_guest_entry(struct kvm_vcpu *vcpu, u64 time_limit,
dec = mfspr(SPRN_DEC);
tb = mftb();
if (dec < 512)
if (dec < 0)
return BOOK3S_INTERRUPT_HV_DECREMENTER;
local_paca->kvm_hstate.dec_expires = dec + tb;
if (local_paca->kvm_hstate.dec_expires < time_limit)
@ -5257,6 +5267,12 @@ static long kvm_arch_vm_ioctl_hv(struct file *filp,
case KVM_PPC_ALLOCATE_HTAB: {
u32 htab_order;
/* If we're a nested hypervisor, we currently only support radix */
if (kvmhv_on_pseries()) {
r = -EOPNOTSUPP;
break;
}
r = -EFAULT;
if (get_user(htab_order, (u32 __user *)argp))
break;

9
arch/powerpc/kvm/book3s_hv_interrupts.S
View File

@ -58,13 +58,16 @@ END_FTR_SECTION_IFCLR(CPU_FTR_ARCH_207S)
/*
* Put whatever is in the decrementer into the
* hypervisor decrementer.
* Because of a hardware deviation in P8 and P9,
* we need to set LPCR[HDICE] before writing HDEC.
*/
BEGIN_FTR_SECTION
ld r5, HSTATE_KVM_VCORE(r13)
ld r6, VCORE_KVM(r5)
ld r9, KVM_HOST_LPCR(r6)
andis. r9, r9, LPCR_LD@h
END_FTR_SECTION_IFSET(CPU_FTR_ARCH_300)
ori r8, r9, LPCR_HDICE
mtspr SPRN_LPCR, r8
isync
andis. r0, r9, LPCR_LD@h
mfspr r8,SPRN_DEC
mftb r7
BEGIN_FTR_SECTION

2
arch/powerpc/kvm/book3s_hv_nested.c
View File

@ -569,7 +569,7 @@ static void kvmhv_update_ptbl_cache(struct kvm_nested_guest *gp)
kvmhv_set_nested_ptbl(gp);
}
struct kvm_nested_guest *kvmhv_alloc_nested(struct kvm *kvm, unsigned int lpid)
static struct kvm_nested_guest *kvmhv_alloc_nested(struct kvm *kvm, unsigned int lpid)
{
struct kvm_nested_guest *gp;
long shadow_lpid;

2
arch/powerpc/kvm/book3s_hv_rm_xics.c
View File

@ -764,7 +764,7 @@ int xics_rm_h_eoi(struct kvm_vcpu *vcpu, unsigned long xirr)
return ics_rm_eoi(vcpu, irq);
}
unsigned long eoi_rc;
static unsigned long eoi_rc;
static void icp_eoi(struct irq_chip *c, u32 hwirq, __be32 xirr, bool *again)
{

2
arch/powerpc/kvm/book3s_pr.c
View File

@ -569,7 +569,7 @@ static void kvmppc_set_msr_pr(struct kvm_vcpu *vcpu, u64 msr)
#endif
}
void kvmppc_set_pvr_pr(struct kvm_vcpu *vcpu, u32 pvr)
static void kvmppc_set_pvr_pr(struct kvm_vcpu *vcpu, u32 pvr)
{
u32 host_pvr;

86
arch/powerpc/kvm/book3s_xics.c
View File

@ -1334,47 +1334,97 @@ static int xics_has_attr(struct kvm_device *dev, struct kvm_device_attr *attr)
return -ENXIO;
}
static void kvmppc_xics_free(struct kvm_device *dev)
/*
* Called when device fd is closed. kvm->lock is held.
*/
static void kvmppc_xics_release(struct kvm_device *dev)
{
struct kvmppc_xics *xics = dev->private;
int i;
struct kvm *kvm = xics->kvm;
struct kvm_vcpu *vcpu;
pr_devel("Releasing xics device\n");
/*
* Since this is the device release function, we know that
* userspace does not have any open fd referring to the
* device. Therefore there can not be any of the device
* attribute set/get functions being executed concurrently,
* and similarly, the connect_vcpu and set/clr_mapped
* functions also cannot be being executed.
*/
debugfs_remove(xics->dentry);
/*
* We should clean up the vCPU interrupt presenters first.
*/
kvm_for_each_vcpu(i, vcpu, kvm) {
/*
* Take vcpu->mutex to ensure that no one_reg get/set ioctl
* (i.e. kvmppc_xics_[gs]et_icp) can be done concurrently.
* Holding the vcpu->mutex also means that execution is
* excluded for the vcpu until the ICP was freed. When the vcpu
* can execute again, vcpu->arch.icp and vcpu->arch.irq_type
* have been cleared and the vcpu will not be going into the
* XICS code anymore.
*/
mutex_lock(&vcpu->mutex);
kvmppc_xics_free_icp(vcpu);
mutex_unlock(&vcpu->mutex);
}
if (kvm)
kvm->arch.xics = NULL;
for (i = 0; i <= xics->max_icsid; i++)
for (i = 0; i <= xics->max_icsid; i++) {
kfree(xics->ics[i]);
kfree(xics);
xics->ics[i] = NULL;
}
/*
* A reference of the kvmppc_xics pointer is now kept under
* the xics_device pointer of the machine for reuse. It is
* freed when the VM is destroyed for now until we fix all the
* execution paths.
*/
kfree(dev);
}
static struct kvmppc_xics *kvmppc_xics_get_device(struct kvm *kvm)
{
struct kvmppc_xics **kvm_xics_device = &kvm->arch.xics_device;
struct kvmppc_xics *xics = *kvm_xics_device;
if (!xics) {
xics = kzalloc(sizeof(*xics), GFP_KERNEL);
*kvm_xics_device = xics;
} else {
memset(xics, 0, sizeof(*xics));
}
return xics;
}
static int kvmppc_xics_create(struct kvm_device *dev, u32 type)
{
struct kvmppc_xics *xics;
struct kvm *kvm = dev->kvm;
int ret = 0;
xics = kzalloc(sizeof(*xics), GFP_KERNEL);
pr_devel("Creating xics for partition\n");
/* Already there ? */
if (kvm->arch.xics)
return -EEXIST;
xics = kvmppc_xics_get_device(kvm);
if (!xics)
return -ENOMEM;
dev->private = xics;
xics->dev = dev;
xics->kvm = kvm;
/* Already there ? */
if (kvm->arch.xics)
ret = -EEXIST;
else
kvm->arch.xics = xics;
if (ret) {
kfree(xics);
return ret;
}
kvm->arch.xics = xics;
#ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE
if (cpu_has_feature(CPU_FTR_ARCH_206) &&
@ -1399,7 +1449,7 @@ struct kvm_device_ops kvm_xics_ops = {
.name = "kvm-xics",
.create = kvmppc_xics_create,
.init = kvmppc_xics_init,
.destroy = kvmppc_xics_free,
.release = kvmppc_xics_release,
.set_attr = xics_set_attr,
.get_attr = xics_get_attr,
.has_attr = xics_has_attr,
@ -1415,7 +1465,7 @@ int kvmppc_xics_connect_vcpu(struct kvm_device *dev, struct kvm_vcpu *vcpu,
return -EPERM;
if (xics->kvm != vcpu->kvm)
return -EPERM;
if (vcpu->arch.irq_type)
if (vcpu->arch.irq_type != KVMPPC_IRQ_DEFAULT)
return -EBUSY;
r = kvmppc_xics_create_icp(vcpu, xcpu);

12
arch/powerpc/kvm/book3s_xive_native.c
View File

@ -1227,17 +1227,7 @@ static int xive_native_debug_show(struct seq_file *m, void *private)
return 0;
}
static int xive_native_debug_open(struct inode *inode, struct file *file)
{
return single_open(file, xive_native_debug_show, inode->i_private);
}
static const struct file_operations xive_native_debug_fops = {
.open = xive_native_debug_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
DEFINE_SHOW_ATTRIBUTE(xive_native_debug);
static void xive_native_debugfs_init(struct kvmppc_xive *xive)
{

6
arch/powerpc/kvm/booke.c
View File

@ -1747,12 +1747,12 @@ int kvmppc_set_one_reg(struct kvm_vcpu *vcpu, u64 id,
int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
{
return -ENOTSUPP;
return -EOPNOTSUPP;
}
int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
{
return -ENOTSUPP;
return -EOPNOTSUPP;
}
int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
@ -1773,7 +1773,7 @@ void kvm_arch_sync_dirty_log(struct kvm *kvm, struct kvm_memory_slot *memslot)
int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, struct kvm_dirty_log *log)
{
return -ENOTSUPP;
return -EOPNOTSUPP;
}
void kvmppc_core_free_memslot(struct kvm *kvm, struct kvm_memory_slot *slot)

70
arch/x86/include/asm/kvm_host.h
View File

@ -80,13 +80,14 @@
#define KVM_REQ_HV_EXIT KVM_ARCH_REQ(21)
#define KVM_REQ_HV_STIMER KVM_ARCH_REQ(22)
#define KVM_REQ_LOAD_EOI_EXITMAP KVM_ARCH_REQ(23)
#define KVM_REQ_GET_VMCS12_PAGES KVM_ARCH_REQ(24)
#define KVM_REQ_GET_NESTED_STATE_PAGES KVM_ARCH_REQ(24)
#define KVM_REQ_APICV_UPDATE \
KVM_ARCH_REQ_FLAGS(25, KVM_REQUEST_WAIT | KVM_REQUEST_NO_WAKEUP)
#define KVM_REQ_TLB_FLUSH_CURRENT KVM_ARCH_REQ(26)
#define KVM_REQ_HV_TLB_FLUSH \
KVM_ARCH_REQ_FLAGS(27, KVM_REQUEST_NO_WAKEUP)
#define KVM_REQ_APF_READY KVM_ARCH_REQ(28)
#define KVM_REQ_MSR_FILTER_CHANGED KVM_ARCH_REQ(29)
#define CR0_RESERVED_BITS \
(~(unsigned long)(X86_CR0_PE | X86_CR0_MP | X86_CR0_EM | X86_CR0_TS \
@ -132,7 +133,7 @@ static inline gfn_t gfn_to_index(gfn_t gfn, gfn_t base_gfn, int level)
#define KVM_NUM_MMU_PAGES (1 << KVM_MMU_HASH_SHIFT)
#define KVM_MIN_FREE_MMU_PAGES 5
#define KVM_REFILL_PAGES 25
#define KVM_MAX_CPUID_ENTRIES 80
#define KVM_MAX_CPUID_ENTRIES 256
#define KVM_NR_FIXED_MTRR_REGION 88
#define KVM_NR_VAR_MTRR 8
@ -636,7 +637,7 @@ struct kvm_vcpu_arch {
int halt_request; /* real mode on Intel only */
int cpuid_nent;
struct kvm_cpuid_entry2 cpuid_entries[KVM_MAX_CPUID_ENTRIES];
struct kvm_cpuid_entry2 *cpuid_entries;
int maxphyaddr;
int max_tdp_level;
@ -788,6 +789,21 @@ struct kvm_vcpu_arch {
/* AMD MSRC001_0015 Hardware Configuration */
u64 msr_hwcr;
/* pv related cpuid info */
struct {
/*
* value of the eax register in the KVM_CPUID_FEATURES CPUID
* leaf.
*/
u32 features;
/*
* indicates whether pv emulation should be disabled if features
* are not present in the guest's cpuid
*/
bool enforce;
} pv_cpuid;
};
struct kvm_lpage_info {
@ -860,6 +876,13 @@ struct kvm_hv {
struct kvm_hv_syndbg hv_syndbg;
};
struct msr_bitmap_range {
u32 flags;
u32 nmsrs;
u32 base;
unsigned long *bitmap;
};
enum kvm_irqchip_mode {
KVM_IRQCHIP_NONE,
KVM_IRQCHIP_KERNEL, /* created with KVM_CREATE_IRQCHIP */
@ -961,8 +984,31 @@ struct kvm_arch {
bool guest_can_read_msr_platform_info;
bool exception_payload_enabled;
/* Deflect RDMSR and WRMSR to user space when they trigger a #GP */
u32 user_space_msr_mask;
struct {
u8 count;
bool default_allow:1;
struct msr_bitmap_range ranges[16];
} msr_filter;
struct kvm_pmu_event_filter *pmu_event_filter;
struct task_struct *nx_lpage_recovery_thread;
/*
* Whether the TDP MMU is enabled for this VM. This contains a
* snapshot of the TDP MMU module parameter from when the VM was
* created and remains unchanged for the life of the VM. If this is
* true, TDP MMU handler functions will run for various MMU
* operations.
*/
bool tdp_mmu_enabled;
/* List of struct tdp_mmu_pages being used as roots */
struct list_head tdp_mmu_roots;
/* List of struct tdp_mmu_pages not being used as roots */
struct list_head tdp_mmu_pages;
};
struct kvm_vm_stat {
@ -1069,7 +1115,7 @@ struct kvm_x86_ops {
void (*get_cs_db_l_bits)(struct kvm_vcpu *vcpu, int *db, int *l);
void (*set_cr0)(struct kvm_vcpu *vcpu, unsigned long cr0);
int (*set_cr4)(struct kvm_vcpu *vcpu, unsigned long cr4);
void (*set_efer)(struct kvm_vcpu *vcpu, u64 efer);
int (*set_efer)(struct kvm_vcpu *vcpu, u64 efer);
void (*get_idt)(struct kvm_vcpu *vcpu, struct desc_ptr *dt);
void (*set_idt)(struct kvm_vcpu *vcpu, struct desc_ptr *dt);
void (*get_gdt)(struct kvm_vcpu *vcpu, struct desc_ptr *dt);
@ -1143,7 +1189,12 @@ struct kvm_x86_ops {
/* Returns actual tsc_offset set in active VMCS */
u64 (*write_l1_tsc_offset)(struct kvm_vcpu *vcpu, u64 offset);
void (*get_exit_info)(struct kvm_vcpu *vcpu, u64 *info1, u64 *info2);
/*
* Retrieve somewhat arbitrary exit information. Intended to be used
* only from within tracepoints to avoid VMREADs when tracing is off.
*/
void (*get_exit_info)(struct kvm_vcpu *vcpu, u64 *info1, u64 *info2,
u32 *exit_int_info, u32 *exit_int_info_err_code);
int (*check_intercept)(struct kvm_vcpu *vcpu,
struct x86_instruction_info *info,
@ -1221,12 +1272,13 @@ struct kvm_x86_ops {
int (*get_msr_feature)(struct kvm_msr_entry *entry);
bool (*need_emulation_on_page_fault)(struct kvm_vcpu *vcpu);
bool (*can_emulate_instruction)(struct kvm_vcpu *vcpu, void *insn, int insn_len);
bool (*apic_init_signal_blocked)(struct kvm_vcpu *vcpu);
int (*enable_direct_tlbflush)(struct kvm_vcpu *vcpu);
void (*migrate_timers)(struct kvm_vcpu *vcpu);
void (*msr_filter_changed)(struct kvm_vcpu *vcpu);
};
struct kvm_x86_nested_ops {
@ -1238,7 +1290,7 @@ struct kvm_x86_nested_ops {
int (*set_state)(struct kvm_vcpu *vcpu,
struct kvm_nested_state __user *user_kvm_nested_state,
struct kvm_nested_state *kvm_state);
bool (*get_vmcs12_pages)(struct kvm_vcpu *vcpu);
bool (*get_nested_state_pages)(struct kvm_vcpu *vcpu);
int (*write_log_dirty)(struct kvm_vcpu *vcpu, gpa_t l2_gpa);
int (*enable_evmcs)(struct kvm_vcpu *vcpu,
@ -1612,8 +1664,8 @@ int kvm_pv_send_ipi(struct kvm *kvm, unsigned long ipi_bitmap_low,
unsigned long ipi_bitmap_high, u32 min,
unsigned long icr, int op_64_bit);
void kvm_define_shared_msr(unsigned index, u32 msr);
int kvm_set_shared_msr(unsigned index, u64 val, u64 mask);
void kvm_define_user_return_msr(unsigned index, u32 msr);
int kvm_set_user_return_msr(unsigned index, u64 val, u64 mask);
u64 kvm_scale_tsc(struct kvm_vcpu *vcpu, u64 tsc);
u64 kvm_read_l1_tsc(struct kvm_vcpu *vcpu, u64 host_tsc);

88
arch/x86/include/asm/svm.h
View File

@ -3,10 +3,54 @@
#define __SVM_H
#include <uapi/asm/svm.h>
#include <uapi/asm/kvm.h>
/*
* 32-bit intercept words in the VMCB Control Area, starting
* at Byte offset 000h.
*/
enum intercept_words {
INTERCEPT_CR = 0,
INTERCEPT_DR,
INTERCEPT_EXCEPTION,
INTERCEPT_WORD3,
INTERCEPT_WORD4,
INTERCEPT_WORD5,
MAX_INTERCEPT,
};
enum {
INTERCEPT_INTR,
/* Byte offset 000h (word 0) */
INTERCEPT_CR0_READ = 0,
INTERCEPT_CR3_READ = 3,
INTERCEPT_CR4_READ = 4,
INTERCEPT_CR8_READ = 8,
INTERCEPT_CR0_WRITE = 16,
INTERCEPT_CR3_WRITE = 16 + 3,
INTERCEPT_CR4_WRITE = 16 + 4,
INTERCEPT_CR8_WRITE = 16 + 8,
/* Byte offset 004h (word 1) */
INTERCEPT_DR0_READ = 32,
INTERCEPT_DR1_READ,
INTERCEPT_DR2_READ,
INTERCEPT_DR3_READ,
INTERCEPT_DR4_READ,
INTERCEPT_DR5_READ,
INTERCEPT_DR6_READ,
INTERCEPT_DR7_READ,
INTERCEPT_DR0_WRITE = 48,
INTERCEPT_DR1_WRITE,
INTERCEPT_DR2_WRITE,
INTERCEPT_DR3_WRITE,
INTERCEPT_DR4_WRITE,
INTERCEPT_DR5_WRITE,
INTERCEPT_DR6_WRITE,
INTERCEPT_DR7_WRITE,
/* Byte offset 008h (word 2) */
INTERCEPT_EXCEPTION_OFFSET = 64,
/* Byte offset 00Ch (word 3) */
INTERCEPT_INTR = 96,
INTERCEPT_NMI,
INTERCEPT_SMI,
INTERCEPT_INIT,
@ -38,7 +82,8 @@ enum {
INTERCEPT_TASK_SWITCH,
INTERCEPT_FERR_FREEZE,
INTERCEPT_SHUTDOWN,
INTERCEPT_VMRUN,
/* Byte offset 010h (word 4) */
INTERCEPT_VMRUN = 128,
INTERCEPT_VMMCALL,
INTERCEPT_VMLOAD,
INTERCEPT_VMSAVE,
@ -53,15 +98,18 @@ enum {
INTERCEPT_MWAIT_COND,
INTERCEPT_XSETBV,
INTERCEPT_RDPRU,
/* Byte offset 014h (word 5) */
INTERCEPT_INVLPGB = 160,
INTERCEPT_INVLPGB_ILLEGAL,
INTERCEPT_INVPCID,
INTERCEPT_MCOMMIT,
INTERCEPT_TLBSYNC,
};
struct __attribute__ ((__packed__)) vmcb_control_area {
u32 intercept_cr;
u32 intercept_dr;
u32 intercept_exceptions;
u64 intercept;
u8 reserved_1[40];
u32 intercepts[MAX_INTERCEPT];
u32 reserved_1[15 - MAX_INTERCEPT];
u16 pause_filter_thresh;
u16 pause_filter_count;
u64 iopm_base_pa;
@ -287,32 +335,6 @@ struct vmcb {
#define SVM_SELECTOR_READ_MASK SVM_SELECTOR_WRITE_MASK
#define SVM_SELECTOR_CODE_MASK (1 << 3)
#define INTERCEPT_CR0_READ 0
#define INTERCEPT_CR3_READ 3
#define INTERCEPT_CR4_READ 4
#define INTERCEPT_CR8_READ 8
#define INTERCEPT_CR0_WRITE (16 + 0)
#define INTERCEPT_CR3_WRITE (16 + 3)
#define INTERCEPT_CR4_WRITE (16 + 4)
#define INTERCEPT_CR8_WRITE (16 + 8)
#define INTERCEPT_DR0_READ 0
#define INTERCEPT_DR1_READ 1
#define INTERCEPT_DR2_READ 2
#define INTERCEPT_DR3_READ 3
#define INTERCEPT_DR4_READ 4
#define INTERCEPT_DR5_READ 5
#define INTERCEPT_DR6_READ 6
#define INTERCEPT_DR7_READ 7
#define INTERCEPT_DR0_WRITE (16 + 0)
#define INTERCEPT_DR1_WRITE (16 + 1)
#define INTERCEPT_DR2_WRITE (16 + 2)
#define INTERCEPT_DR3_WRITE (16 + 3)
#define INTERCEPT_DR4_WRITE (16 + 4)
#define INTERCEPT_DR5_WRITE (16 + 5)
#define INTERCEPT_DR6_WRITE (16 + 6)
#define INTERCEPT_DR7_WRITE (16 + 7)
#define SVM_EVTINJ_VEC_MASK 0xff
#define SVM_EVTINJ_TYPE_SHIFT 8

2
arch/x86/include/asm/vmx.h
View File

@ -52,7 +52,7 @@
#define SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES VMCS_CONTROL_BIT(VIRT_APIC_ACCESSES)
#define SECONDARY_EXEC_ENABLE_EPT VMCS_CONTROL_BIT(EPT)
#define SECONDARY_EXEC_DESC VMCS_CONTROL_BIT(DESC_EXITING)
#define SECONDARY_EXEC_RDTSCP VMCS_CONTROL_BIT(RDTSCP)
#define SECONDARY_EXEC_ENABLE_RDTSCP VMCS_CONTROL_BIT(RDTSCP)
#define SECONDARY_EXEC_VIRTUALIZE_X2APIC_MODE VMCS_CONTROL_BIT(VIRTUAL_X2APIC)
#define SECONDARY_EXEC_ENABLE_VPID VMCS_CONTROL_BIT(VPID)
#define SECONDARY_EXEC_WBINVD_EXITING VMCS_CONTROL_BIT(WBINVD_EXITING)

20
arch/x86/include/uapi/asm/kvm.h
View File

@ -192,6 +192,26 @@ struct kvm_msr_list {
__u32 indices[0];
};
/* Maximum size of any access bitmap in bytes */
#define KVM_MSR_FILTER_MAX_BITMAP_SIZE 0x600
/* for KVM_X86_SET_MSR_FILTER */
struct kvm_msr_filter_range {
#define KVM_MSR_FILTER_READ (1 << 0)
#define KVM_MSR_FILTER_WRITE (1 << 1)
__u32 flags;
__u32 nmsrs; /* number of msrs in bitmap */
__u32 base; /* MSR index the bitmap starts at */
__u8 *bitmap; /* a 1 bit allows the operations in flags, 0 denies */
};
#define KVM_MSR_FILTER_MAX_RANGES 16
struct kvm_msr_filter {
#define KVM_MSR_FILTER_DEFAULT_ALLOW (0 << 0)
#define KVM_MSR_FILTER_DEFAULT_DENY (1 << 0)
__u32 flags;
struct kvm_msr_filter_range ranges[KVM_MSR_FILTER_MAX_RANGES];
};
struct kvm_cpuid_entry {
__u32 function;

2
arch/x86/include/uapi/asm/svm.h
View File

@ -77,6 +77,7 @@
#define SVM_EXIT_MWAIT_COND 0x08c
#define SVM_EXIT_XSETBV 0x08d
#define SVM_EXIT_RDPRU 0x08e
#define SVM_EXIT_INVPCID 0x0a2
#define SVM_EXIT_NPF 0x400
#define SVM_EXIT_AVIC_INCOMPLETE_IPI 0x401
#define SVM_EXIT_AVIC_UNACCELERATED_ACCESS 0x402
@ -182,6 +183,7 @@
{ SVM_EXIT_MONITOR, "monitor" }, \
{ SVM_EXIT_MWAIT, "mwait" }, \
{ SVM_EXIT_XSETBV, "xsetbv" }, \
{ SVM_EXIT_INVPCID, "invpcid" }, \
{ SVM_EXIT_NPF, "npf" }, \
{ SVM_EXIT_AVIC_INCOMPLETE_IPI, "avic_incomplete_ipi" }, \
{ SVM_EXIT_AVIC_UNACCELERATED_ACCESS, "avic_unaccelerated_access" }, \

2
arch/x86/kernel/kvm.c
View File

@ -975,7 +975,7 @@ void arch_haltpoll_disable(unsigned int cpu)
if (!kvm_para_has_feature(KVM_FEATURE_POLL_CONTROL))
return;
/* Enable guest halt poll disables host halt poll */
/* Disable guest halt poll enables host halt poll */
smp_call_function_single(cpu, kvm_enable_host_haltpoll, NULL, 1);
}
EXPORT_SYMBOL_GPL(arch_haltpoll_disable);

1
arch/x86/kvm/Kconfig
View File

@ -66,6 +66,7 @@ config KVM_WERROR
default y if X86_64 && !KASAN
# We use the dependency on !COMPILE_TEST to not be enabled
# blindly in allmodconfig or allyesconfig configurations
depends on KVM
depends on (X86_64 && !KASAN) || !COMPILE_TEST
depends on EXPERT
help

6
arch/x86/kvm/Makefile
View File

@ -15,9 +15,11 @@ kvm-$(CONFIG_KVM_ASYNC_PF) += $(KVM)/async_pf.o
kvm-y += x86.o emulate.o i8259.o irq.o lapic.o \
i8254.o ioapic.o irq_comm.o cpuid.o pmu.o mtrr.o \
hyperv.o debugfs.o mmu/mmu.o mmu/page_track.o
hyperv.o debugfs.o mmu/mmu.o mmu/page_track.o \
mmu/spte.o mmu/tdp_iter.o mmu/tdp_mmu.o
kvm-intel-y += vmx/vmx.o vmx/vmenter.o vmx/pmu_intel.o vmx/vmcs12.o vmx/evmcs.o vmx/nested.o
kvm-intel-y += vmx/vmx.o vmx/vmenter.o vmx/pmu_intel.o vmx/vmcs12.o \
vmx/evmcs.o vmx/nested.o vmx/posted_intr.o
kvm-amd-y += svm/svm.o svm/vmenter.o svm/pmu.o svm/nested.o svm/avic.o svm/sev.o
obj-$(CONFIG_KVM) += kvm.o

139
arch/x86/kvm/cpuid.c
View File

@ -54,7 +54,24 @@ static u32 xstate_required_size(u64 xstate_bv, bool compacted)
#define F feature_bit
static int kvm_check_cpuid(struct kvm_vcpu *vcpu)
static inline struct kvm_cpuid_entry2 *cpuid_entry2_find(
struct kvm_cpuid_entry2 *entries, int nent, u32 function, u32 index)
{
struct kvm_cpuid_entry2 *e;
int i;
for (i = 0; i < nent; i++) {
e = &entries[i];
if (e->function == function && (e->index == index ||
!(e->flags & KVM_CPUID_FLAG_SIGNIFCANT_INDEX)))
return e;
}
return NULL;
}
static int kvm_check_cpuid(struct kvm_cpuid_entry2 *entries, int nent)
{
struct kvm_cpuid_entry2 *best;
@ -62,7 +79,7 @@ static int kvm_check_cpuid(struct kvm_vcpu *vcpu)
* The existing code assumes virtual address is 48-bit or 57-bit in the
* canonical address checks; exit if it is ever changed.
*/
best = kvm_find_cpuid_entry(vcpu, 0x80000008, 0);
best = cpuid_entry2_find(entries, nent, 0x80000008, 0);
if (best) {
int vaddr_bits = (best->eax & 0xff00) >> 8;
@ -107,6 +124,13 @@ void kvm_update_cpuid_runtime(struct kvm_vcpu *vcpu)
(best->eax & (1 << KVM_FEATURE_PV_UNHALT)))
best->eax &= ~(1 << KVM_FEATURE_PV_UNHALT);
/*
* save the feature bitmap to avoid cpuid lookup for every PV
* operation
*/
if (best)
vcpu->arch.pv_cpuid.features = best->eax;
if (!kvm_check_has_quirk(vcpu->kvm, KVM_X86_QUIRK_MISC_ENABLE_NO_MWAIT)) {
best = kvm_find_cpuid_entry(vcpu, 0x1, 0);
if (best)
@ -121,8 +145,6 @@ static void kvm_vcpu_after_set_cpuid(struct kvm_vcpu *vcpu)
struct kvm_lapic *apic = vcpu->arch.apic;
struct kvm_cpuid_entry2 *best;
kvm_x86_ops.vcpu_after_set_cpuid(vcpu);
best = kvm_find_cpuid_entry(vcpu, 1, 0);
if (best && apic) {
if (cpuid_entry_has(best, X86_FEATURE_TSC_DEADLINE_TIMER))
@ -146,7 +168,9 @@ static void kvm_vcpu_after_set_cpuid(struct kvm_vcpu *vcpu)
kvm_pmu_refresh(vcpu);
vcpu->arch.cr4_guest_rsvd_bits =
__cr4_reserved_bits(guest_cpuid_has, vcpu);
kvm_x86_ops.update_exception_bitmap(vcpu);
/* Invoke the vendor callback only after the above state is updated. */
kvm_x86_ops.vcpu_after_set_cpuid(vcpu);
}
static int is_efer_nx(void)
@ -186,7 +210,6 @@ int cpuid_query_maxphyaddr(struct kvm_vcpu *vcpu)
not_found:
return 36;
}
EXPORT_SYMBOL_GPL(cpuid_query_maxphyaddr);
/* when an old userspace process fills a new kernel module */
int kvm_vcpu_ioctl_set_cpuid(struct kvm_vcpu *vcpu,
@ -194,46 +217,53 @@ int kvm_vcpu_ioctl_set_cpuid(struct kvm_vcpu *vcpu,
struct kvm_cpuid_entry __user *entries)
{
int r, i;
struct kvm_cpuid_entry *cpuid_entries = NULL;
struct kvm_cpuid_entry *e = NULL;
struct kvm_cpuid_entry2 *e2 = NULL;
r = -E2BIG;
if (cpuid->nent > KVM_MAX_CPUID_ENTRIES)
goto out;
return -E2BIG;
if (cpuid->nent) {
cpuid_entries = vmemdup_user(entries,
array_size(sizeof(struct kvm_cpuid_entry),
cpuid->nent));
if (IS_ERR(cpuid_entries)) {
r = PTR_ERR(cpuid_entries);
goto out;
e = vmemdup_user(entries, array_size(sizeof(*e), cpuid->nent));
if (IS_ERR(e))
return PTR_ERR(e);
e2 = kvmalloc_array(cpuid->nent, sizeof(*e2), GFP_KERNEL_ACCOUNT);
if (!e2) {
r = -ENOMEM;
goto out_free_cpuid;
}
}
for (i = 0; i < cpuid->nent; i++) {
vcpu->arch.cpuid_entries[i].function = cpuid_entries[i].function;
vcpu->arch.cpuid_entries[i].eax = cpuid_entries[i].eax;
vcpu->arch.cpuid_entries[i].ebx = cpuid_entries[i].ebx;
vcpu->arch.cpuid_entries[i].ecx = cpuid_entries[i].ecx;
vcpu->arch.cpuid_entries[i].edx = cpuid_entries[i].edx;
vcpu->arch.cpuid_entries[i].index = 0;
vcpu->arch.cpuid_entries[i].flags = 0;
vcpu->arch.cpuid_entries[i].padding[0] = 0;
vcpu->arch.cpuid_entries[i].padding[1] = 0;
vcpu->arch.cpuid_entries[i].padding[2] = 0;
e2[i].function = e[i].function;
e2[i].eax = e[i].eax;
e2[i].ebx = e[i].ebx;
e2[i].ecx = e[i].ecx;
e2[i].edx = e[i].edx;
e2[i].index = 0;
e2[i].flags = 0;
e2[i].padding[0] = 0;
e2[i].padding[1] = 0;
e2[i].padding[2] = 0;
}
vcpu->arch.cpuid_nent = cpuid->nent;
r = kvm_check_cpuid(vcpu);
r = kvm_check_cpuid(e2, cpuid->nent);
if (r) {
vcpu->arch.cpuid_nent = 0;
kvfree(cpuid_entries);
goto out;
kvfree(e2);
goto out_free_cpuid;
}
kvfree(vcpu->arch.cpuid_entries);
vcpu->arch.cpuid_entries = e2;
vcpu->arch.cpuid_nent = cpuid->nent;
cpuid_fix_nx_cap(vcpu);
kvm_update_cpuid_runtime(vcpu);
kvm_vcpu_after_set_cpuid(vcpu);
kvfree(cpuid_entries);
out:
out_free_cpuid:
kvfree(e);
return r;
}
@ -241,26 +271,32 @@ int kvm_vcpu_ioctl_set_cpuid2(struct kvm_vcpu *vcpu,
struct kvm_cpuid2 *cpuid,
struct kvm_cpuid_entry2 __user *entries)
{
struct kvm_cpuid_entry2 *e2 = NULL;
int r;
r = -E2BIG;
if (cpuid->nent > KVM_MAX_CPUID_ENTRIES)
goto out;
r = -EFAULT;
if (copy_from_user(&vcpu->arch.cpuid_entries, entries,
cpuid->nent * sizeof(struct kvm_cpuid_entry2)))
goto out;
vcpu->arch.cpuid_nent = cpuid->nent;
r = kvm_check_cpuid(vcpu);
if (r) {
vcpu->arch.cpuid_nent = 0;
goto out;
return -E2BIG;
if (cpuid->nent) {
e2 = vmemdup_user(entries, array_size(sizeof(*e2), cpuid->nent));
if (IS_ERR(e2))
return PTR_ERR(e2);
}
r = kvm_check_cpuid(e2, cpuid->nent);
if (r) {
kvfree(e2);
return r;
}
kvfree(vcpu->arch.cpuid_entries);
vcpu->arch.cpuid_entries = e2;
vcpu->arch.cpuid_nent = cpuid->nent;
kvm_update_cpuid_runtime(vcpu);
kvm_vcpu_after_set_cpuid(vcpu);
out:
return r;
return 0;
}
int kvm_vcpu_ioctl_get_cpuid2(struct kvm_vcpu *vcpu,
@ -941,17 +977,8 @@ int kvm_dev_ioctl_get_cpuid(struct kvm_cpuid2 *cpuid,
struct kvm_cpuid_entry2 *kvm_find_cpuid_entry(struct kvm_vcpu *vcpu,
u32 function, u32 index)
{
struct kvm_cpuid_entry2 *e;
int i;
for (i = 0; i < vcpu->arch.cpuid_nent; ++i) {
e = &vcpu->arch.cpuid_entries[i];
if (e->function == function && (e->index == index ||
!(e->flags & KVM_CPUID_FLAG_SIGNIFCANT_INDEX)))
return e;
}
return NULL;
return cpuid_entry2_find(vcpu->arch.cpuid_entries, vcpu->arch.cpuid_nent,
function, index);
}
EXPORT_SYMBOL_GPL(kvm_find_cpuid_entry);

15
arch/x86/kvm/cpuid.h
View File

@ -5,6 +5,7 @@
#include "x86.h"
#include <asm/cpu.h>
#include <asm/processor.h>
#include <uapi/asm/kvm_para.h>
extern u32 kvm_cpu_caps[NCAPINTS] __read_mostly;
void kvm_set_cpu_caps(void);
@ -34,6 +35,11 @@ static inline int cpuid_maxphyaddr(struct kvm_vcpu *vcpu)
return vcpu->arch.maxphyaddr;
}
static inline bool kvm_vcpu_is_illegal_gpa(struct kvm_vcpu *vcpu, gpa_t gpa)
{
return (gpa >= BIT_ULL(cpuid_maxphyaddr(vcpu)));
}
struct cpuid_reg {
u32 function;
u32 index;
@ -308,4 +314,13 @@ static inline bool page_address_valid(struct kvm_vcpu *vcpu, gpa_t gpa)
return PAGE_ALIGNED(gpa) && !(gpa >> cpuid_maxphyaddr(vcpu));
}
static __always_inline bool guest_pv_has(struct kvm_vcpu *vcpu,
unsigned int kvm_feature)
{
if (!vcpu->arch.pv_cpuid.enforce)
return true;
return vcpu->arch.pv_cpuid.features & (1u << kvm_feature);
}
#endif

22
arch/x86/kvm/emulate.c
View File

@ -3606,7 +3606,7 @@ static int em_rdpid(struct x86_emulate_ctxt *ctxt)
u64 tsc_aux = 0;
if (ctxt->ops->get_msr(ctxt, MSR_TSC_AUX, &tsc_aux))
return emulate_gp(ctxt, 0);
return emulate_ud(ctxt);
ctxt->dst.val = tsc_aux;
return X86EMUL_CONTINUE;
}
@ -3701,21 +3701,35 @@ static int em_dr_write(struct x86_emulate_ctxt *ctxt)
static int em_wrmsr(struct x86_emulate_ctxt *ctxt)
{
u64 msr_index = reg_read(ctxt, VCPU_REGS_RCX);
u64 msr_data;
int r;
msr_data = (u32)reg_read(ctxt, VCPU_REGS_RAX)
| ((u64)reg_read(ctxt, VCPU_REGS_RDX) << 32);
if (ctxt->ops->set_msr(ctxt, reg_read(ctxt, VCPU_REGS_RCX), msr_data))
r = ctxt->ops->set_msr(ctxt, msr_index, msr_data);
if (r == X86EMUL_IO_NEEDED)
return r;
if (r > 0)
return emulate_gp(ctxt, 0);
return X86EMUL_CONTINUE;
return r < 0 ? X86EMUL_UNHANDLEABLE : X86EMUL_CONTINUE;
}
static int em_rdmsr(struct x86_emulate_ctxt *ctxt)
{
u64 msr_index = reg_read(ctxt, VCPU_REGS_RCX);
u64 msr_data;
int r;
if (ctxt->ops->get_msr(ctxt, reg_read(ctxt, VCPU_REGS_RCX), &msr_data))
r = ctxt->ops->get_msr(ctxt, msr_index, &msr_data);
if (r == X86EMUL_IO_NEEDED)
return r;
if (r)
return emulate_gp(ctxt, 0);
*reg_write(ctxt, VCPU_REGS_RAX) = (u32)msr_data;

11
arch/x86/kvm/hyperv.c
View File

@ -633,6 +633,11 @@ static int stimer_set_config(struct kvm_vcpu_hv_stimer *stimer, u64 config,
{
union hv_stimer_config new_config = {.as_uint64 = config},
old_config = {.as_uint64 = stimer->config.as_uint64};
struct kvm_vcpu *vcpu = stimer_to_vcpu(stimer);
struct kvm_vcpu_hv_synic *synic = vcpu_to_synic(vcpu);
if (!synic->active && !host)
return 1;
trace_kvm_hv_stimer_set_config(stimer_to_vcpu(stimer)->vcpu_id,
stimer->index, config, host);
@ -652,6 +657,12 @@ static int stimer_set_config(struct kvm_vcpu_hv_stimer *stimer, u64 config,
static int stimer_set_count(struct kvm_vcpu_hv_stimer *stimer, u64 count,
bool host)
{
struct kvm_vcpu *vcpu = stimer_to_vcpu(stimer);
struct kvm_vcpu_hv_synic *synic = vcpu_to_synic(vcpu);
if (!synic->active && !host)
return 1;
trace_kvm_hv_stimer_set_count(stimer_to_vcpu(stimer)->vcpu_id,
stimer->index, count, host);

2
arch/x86/kvm/kvm_cache_regs.h
View File

@ -7,7 +7,7 @@
#define KVM_POSSIBLE_CR0_GUEST_BITS X86_CR0_TS
#define KVM_POSSIBLE_CR4_GUEST_BITS \
(X86_CR4_PVI | X86_CR4_DE | X86_CR4_PCE | X86_CR4_OSFXSR \
| X86_CR4_OSXMMEXCPT | X86_CR4_LA57 | X86_CR4_PGE | X86_CR4_TSD)
| X86_CR4_OSXMMEXCPT | X86_CR4_PGE | X86_CR4_TSD | X86_CR4_FSGSBASE)
#define BUILD_KVM_GPR_ACCESSORS(lname, uname) \
static __always_inline unsigned long kvm_##lname##_read(struct kvm_vcpu *vcpu)\

43
arch/x86/kvm/lapic.c
View File

@ -310,6 +310,12 @@ static inline void kvm_apic_set_ldr(struct kvm_lapic *apic, u32 id)
atomic_set_release(&apic->vcpu->kvm->arch.apic_map_dirty, DIRTY);
}
static inline void kvm_apic_set_dfr(struct kvm_lapic *apic, u32 val)
{
kvm_lapic_set_reg(apic, APIC_DFR, val);
atomic_set_release(&apic->vcpu->kvm->arch.apic_map_dirty, DIRTY);
}
static inline u32 kvm_apic_calc_x2apic_ldr(u32 id)
{
return ((id >> 4) << 16) | (1 << (id & 0xf));
@ -488,6 +494,12 @@ static inline void apic_clear_irr(int vec, struct kvm_lapic *apic)
}
}
void kvm_apic_clear_irr(struct kvm_vcpu *vcpu, int vec)
{
apic_clear_irr(vec, vcpu->arch.apic);
}
EXPORT_SYMBOL_GPL(kvm_apic_clear_irr);
static inline void apic_set_isr(int vec, struct kvm_lapic *apic)
{
struct kvm_vcpu *vcpu;
@ -1576,9 +1588,6 @@ static void __kvm_wait_lapic_expire(struct kvm_vcpu *vcpu)
struct kvm_lapic *apic = vcpu->arch.apic;
u64 guest_tsc, tsc_deadline;
if (apic->lapic_timer.expired_tscdeadline == 0)
return;
tsc_deadline = apic->lapic_timer.expired_tscdeadline;
apic->lapic_timer.expired_tscdeadline = 0;
guest_tsc = kvm_read_l1_tsc(vcpu, rdtsc());
@ -1593,7 +1602,10 @@ static void __kvm_wait_lapic_expire(struct kvm_vcpu *vcpu)
void kvm_wait_lapic_expire(struct kvm_vcpu *vcpu)
{
if (lapic_timer_int_injected(vcpu))
if (lapic_in_kernel(vcpu) &&
vcpu->arch.apic->lapic_timer.expired_tscdeadline &&
vcpu->arch.apic->lapic_timer.timer_advance_ns &&
lapic_timer_int_injected(vcpu))
__kvm_wait_lapic_expire(vcpu);
}
EXPORT_SYMBOL_GPL(kvm_wait_lapic_expire);
@ -1629,14 +1641,15 @@ static void apic_timer_expired(struct kvm_lapic *apic, bool from_timer_fn)
}
if (kvm_use_posted_timer_interrupt(apic->vcpu)) {
if (apic->lapic_timer.timer_advance_ns)
__kvm_wait_lapic_expire(vcpu);
kvm_wait_lapic_expire(vcpu);
kvm_apic_inject_pending_timer_irqs(apic);
return;
}
atomic_inc(&apic->lapic_timer.pending);
kvm_set_pending_timer(vcpu);
kvm_make_request(KVM_REQ_PENDING_TIMER, vcpu);
if (from_timer_fn)
kvm_vcpu_kick(vcpu);
}
static void start_sw_tscdeadline(struct kvm_lapic *apic)
@ -1984,10 +1997,9 @@ int kvm_lapic_reg_write(struct kvm_lapic *apic, u32 reg, u32 val)
break;
case APIC_DFR:
if (!apic_x2apic_mode(apic)) {
kvm_lapic_set_reg(apic, APIC_DFR, val | 0x0FFFFFFF);
atomic_set_release(&apic->vcpu->kvm->arch.apic_map_dirty, DIRTY);
} else
if (!apic_x2apic_mode(apic))
kvm_apic_set_dfr(apic, val | 0x0FFFFFFF);
else
ret = 1;
break;
@ -2183,8 +2195,7 @@ u64 kvm_get_lapic_tscdeadline_msr(struct kvm_vcpu *vcpu)
{
struct kvm_lapic *apic = vcpu->arch.apic;
if (!lapic_in_kernel(vcpu) ||
!apic_lvtt_tscdeadline(apic))
if (!kvm_apic_present(vcpu) || !apic_lvtt_tscdeadline(apic))
return 0;
return apic->lapic_timer.tscdeadline;
@ -2194,8 +2205,7 @@ void kvm_set_lapic_tscdeadline_msr(struct kvm_vcpu *vcpu, u64 data)
{
struct kvm_lapic *apic = vcpu->arch.apic;
if (!kvm_apic_present(vcpu) || apic_lvtt_oneshot(apic) ||
apic_lvtt_period(apic))
if (!kvm_apic_present(vcpu) || !apic_lvtt_tscdeadline(apic))
return;
hrtimer_cancel(&apic->lapic_timer.timer);
@ -2303,7 +2313,7 @@ void kvm_lapic_reset(struct kvm_vcpu *vcpu, bool init_event)
SET_APIC_DELIVERY_MODE(0, APIC_MODE_EXTINT));
apic_manage_nmi_watchdog(apic, kvm_lapic_get_reg(apic, APIC_LVT0));
kvm_lapic_set_reg(apic, APIC_DFR, 0xffffffffU);
kvm_apic_set_dfr(apic, 0xffffffffU);
apic_set_spiv(apic, 0xff);
kvm_lapic_set_reg(apic, APIC_TASKPRI, 0);
if (!apic_x2apic_mode(apic))
@ -2461,6 +2471,7 @@ int kvm_apic_has_interrupt(struct kvm_vcpu *vcpu)
__apic_update_ppr(apic, &ppr);
return apic_has_interrupt_for_ppr(apic, ppr);
}
EXPORT_SYMBOL_GPL(kvm_apic_has_interrupt);
int kvm_apic_accept_pic_intr(struct kvm_vcpu *vcpu)
{

1
arch/x86/kvm/lapic.h
View File

@ -89,6 +89,7 @@ int kvm_lapic_reg_read(struct kvm_lapic *apic, u32 offset, int len,
bool kvm_apic_match_dest(struct kvm_vcpu *vcpu, struct kvm_lapic *source,
int shorthand, unsigned int dest, int dest_mode);
int kvm_apic_compare_prio(struct kvm_vcpu *vcpu1, struct kvm_vcpu *vcpu2);
void kvm_apic_clear_irr(struct kvm_vcpu *vcpu, int vec);
bool __kvm_apic_update_irr(u32 *pir, void *regs, int *max_irr);
bool kvm_apic_update_irr(struct kvm_vcpu *vcpu, u32 *pir, int *max_irr);
void kvm_apic_update_ppr(struct kvm_vcpu *vcpu);

5
arch/x86/kvm/mmu.h
View File

@ -155,11 +155,6 @@ static inline bool is_write_protection(struct kvm_vcpu *vcpu)
return kvm_read_cr0_bits(vcpu, X86_CR0_WP);
}
static inline bool kvm_mmu_is_illegal_gpa(struct kvm_vcpu *vcpu, gpa_t gpa)
{
return (gpa >= BIT_ULL(cpuid_maxphyaddr(vcpu)));
}
/*
* Check if a given access (described through the I/D, W/R and U/S bits of a
* page fault error code pfec) causes a permission fault with the given PTE

974
arch/x86/kvm/mmu/mmu.c
View File

File diff suppressed because it is too large Load Diff

88
arch/x86/kvm/mmu/mmu_internal.h
View File

@ -3,9 +3,23 @@
#define __KVM_X86_MMU_INTERNAL_H
#include <linux/types.h>
#include <linux/kvm_host.h>
#include <asm/kvm_host.h>
#undef MMU_DEBUG
#ifdef MMU_DEBUG
extern bool dbg;
#define pgprintk(x...) do { if (dbg) printk(x); } while (0)
#define rmap_printk(x...) do { if (dbg) printk(x); } while (0)
#define MMU_WARN_ON(x) WARN_ON(x)
#else
#define pgprintk(x...) do { } while (0)
#define rmap_printk(x...) do { } while (0)
#define MMU_WARN_ON(x) do { } while (0)
#endif
struct kvm_mmu_page {
struct list_head link;
struct hlist_node hash_link;
@ -41,8 +55,12 @@ struct kvm_mmu_page {
/* Number of writes since the last time traversal visited this page. */
atomic_t write_flooding_count;
bool tdp_mmu_page;
};
extern struct kmem_cache *mmu_page_header_cache;
static inline struct kvm_mmu_page *to_shadow_page(hpa_t shadow_page)
{
struct page *page = pfn_to_page(shadow_page >> PAGE_SHIFT);
@ -55,9 +73,77 @@ static inline struct kvm_mmu_page *sptep_to_sp(u64 *sptep)
return to_shadow_page(__pa(sptep));
}
static inline bool kvm_vcpu_ad_need_write_protect(struct kvm_vcpu *vcpu)
{
/*
* When using the EPT page-modification log, the GPAs in the log
* would come from L2 rather than L1. Therefore, we need to rely
* on write protection to record dirty pages. This also bypasses
* PML, since writes now result in a vmexit.
*/
return vcpu->arch.mmu == &vcpu->arch.guest_mmu;
}
bool is_nx_huge_page_enabled(void);
bool mmu_need_write_protect(struct kvm_vcpu *vcpu, gfn_t gfn,
bool can_unsync);
void kvm_mmu_gfn_disallow_lpage(struct kvm_memory_slot *slot, gfn_t gfn);
void kvm_mmu_gfn_allow_lpage(struct kvm_memory_slot *slot, gfn_t gfn);
bool kvm_mmu_slot_gfn_write_protect(struct kvm *kvm,
struct kvm_memory_slot *slot, u64 gfn);
void kvm_flush_remote_tlbs_with_address(struct kvm *kvm,
u64 start_gfn, u64 pages);
static inline void kvm_mmu_get_root(struct kvm *kvm, struct kvm_mmu_page *sp)
{
BUG_ON(!sp->root_count);
lockdep_assert_held(&kvm->mmu_lock);
++sp->root_count;
}
static inline bool kvm_mmu_put_root(struct kvm *kvm, struct kvm_mmu_page *sp)
{
lockdep_assert_held(&kvm->mmu_lock);
--sp->root_count;
return !sp->root_count;
}
/*
* Return values of handle_mmio_page_fault, mmu.page_fault, and fast_page_fault().
*
* RET_PF_RETRY: let CPU fault again on the address.
* RET_PF_EMULATE: mmio page fault, emulate the instruction directly.
* RET_PF_INVALID: the spte is invalid, let the real page fault path update it.
* RET_PF_FIXED: The faulting entry has been fixed.
* RET_PF_SPURIOUS: The faulting entry was already fixed, e.g. by another vCPU.
*/
enum {
RET_PF_RETRY = 0,
RET_PF_EMULATE,
RET_PF_INVALID,
RET_PF_FIXED,
RET_PF_SPURIOUS,
};
/* Bits which may be returned by set_spte() */
#define SET_SPTE_WRITE_PROTECTED_PT BIT(0)
#define SET_SPTE_NEED_REMOTE_TLB_FLUSH BIT(1)
#define SET_SPTE_SPURIOUS BIT(2)
int kvm_mmu_hugepage_adjust(struct kvm_vcpu *vcpu, gfn_t gfn,
int max_level, kvm_pfn_t *pfnp,
bool huge_page_disallowed, int *req_level);
void disallowed_hugepage_adjust(u64 spte, gfn_t gfn, int cur_level,
kvm_pfn_t *pfnp, int *goal_levelp);
bool is_nx_huge_page_enabled(void);
void *mmu_memory_cache_alloc(struct kvm_mmu_memory_cache *mc);
void account_huge_nx_page(struct kvm *kvm, struct kvm_mmu_page *sp);
void unaccount_huge_nx_page(struct kvm *kvm, struct kvm_mmu_page *sp);
#endif /* __KVM_X86_MMU_INTERNAL_H */

21
arch/x86/kvm/mmu/mmutrace.h
View File

@ -202,8 +202,8 @@ DEFINE_EVENT(kvm_mmu_page_class, kvm_mmu_prepare_zap_page,
TRACE_EVENT(
mark_mmio_spte,
TP_PROTO(u64 *sptep, gfn_t gfn, unsigned access, unsigned int gen),
TP_ARGS(sptep, gfn, access, gen),
TP_PROTO(u64 *sptep, gfn_t gfn, u64 spte),
TP_ARGS(sptep, gfn, spte),
TP_STRUCT__entry(
__field(void *, sptep)
@ -215,8 +215,8 @@ TRACE_EVENT(
TP_fast_assign(
__entry->sptep = sptep;
__entry->gfn = gfn;
__entry->access = access;
__entry->gen = gen;
__entry->access = spte & ACC_ALL;
__entry->gen = get_mmio_spte_generation(spte);
),
TP_printk("sptep:%p gfn %llx access %x gen %x", __entry->sptep,
@ -244,14 +244,11 @@ TRACE_EVENT(
__entry->access)
);
#define __spte_satisfied(__spte) \
(__entry->retry && is_writable_pte(__entry->__spte))
TRACE_EVENT(
fast_page_fault,
TP_PROTO(struct kvm_vcpu *vcpu, gpa_t cr2_or_gpa, u32 error_code,
u64 *sptep, u64 old_spte, bool retry),
TP_ARGS(vcpu, cr2_or_gpa, error_code, sptep, old_spte, retry),
u64 *sptep, u64 old_spte, int ret),
TP_ARGS(vcpu, cr2_or_gpa, error_code, sptep, old_spte, ret),
TP_STRUCT__entry(
__field(int, vcpu_id)
@ -260,7 +257,7 @@ TRACE_EVENT(
__field(u64 *, sptep)
__field(u64, old_spte)
__field(u64, new_spte)
__field(bool, retry)
__field(int, ret)
),
TP_fast_assign(
@ -270,7 +267,7 @@ TRACE_EVENT(
__entry->sptep = sptep;
__entry->old_spte = old_spte;
__entry->new_spte = *sptep;
__entry->retry = retry;
__entry->ret = ret;
),
TP_printk("vcpu %d gva %llx error_code %s sptep %p old %#llx"
@ -278,7 +275,7 @@ TRACE_EVENT(
__entry->cr2_or_gpa, __print_flags(__entry->error_code, "|",
kvm_mmu_trace_pferr_flags), __entry->sptep,
__entry->old_spte, __entry->new_spte,
__spte_satisfied(old_spte), __spte_satisfied(new_spte)
__entry->ret == RET_PF_SPURIOUS, __entry->ret == RET_PF_FIXED
)
);

50
arch/x86/kvm/mmu/paging_tmpl.h
View File

@ -550,7 +550,7 @@ FNAME(prefetch_gpte)(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp,
* we call mmu_set_spte() with host_writable = true because
* pte_prefetch_gfn_to_pfn always gets a writable pfn.
*/
mmu_set_spte(vcpu, spte, pte_access, 0, PG_LEVEL_4K, gfn, pfn,
mmu_set_spte(vcpu, spte, pte_access, false, PG_LEVEL_4K, gfn, pfn,
true, true);
kvm_release_pfn_clean(pfn);
@ -625,15 +625,18 @@ static void FNAME(pte_prefetch)(struct kvm_vcpu *vcpu, struct guest_walker *gw,
* emulate this operation, return 1 to indicate this case.
*/
static int FNAME(fetch)(struct kvm_vcpu *vcpu, gpa_t addr,
struct guest_walker *gw,
int write_fault, int max_level,
kvm_pfn_t pfn, bool map_writable, bool prefault,
bool lpage_disallowed)
struct guest_walker *gw, u32 error_code,
int max_level, kvm_pfn_t pfn, bool map_writable,
bool prefault)
{
bool nx_huge_page_workaround_enabled = is_nx_huge_page_enabled();
bool write_fault = error_code & PFERR_WRITE_MASK;
bool exec = error_code & PFERR_FETCH_MASK;
bool huge_page_disallowed = exec && nx_huge_page_workaround_enabled;
struct kvm_mmu_page *sp = NULL;
struct kvm_shadow_walk_iterator it;
unsigned direct_access, access = gw->pt_access;
int top_level, hlevel, ret;
int top_level, level, req_level, ret;
gfn_t base_gfn = gw->gfn;
direct_access = gw->pte_access;
@ -679,7 +682,8 @@ static int FNAME(fetch)(struct kvm_vcpu *vcpu, gpa_t addr,
link_shadow_page(vcpu, it.sptep, sp);
}
hlevel = kvm_mmu_hugepage_adjust(vcpu, gw->gfn, max_level, &pfn);
level = kvm_mmu_hugepage_adjust(vcpu, gw->gfn, max_level, &pfn,
huge_page_disallowed, &req_level);
trace_kvm_mmu_spte_requested(addr, gw->level, pfn);
@ -690,10 +694,12 @@ static int FNAME(fetch)(struct kvm_vcpu *vcpu, gpa_t addr,
* We cannot overwrite existing page tables with an NX
* large page, as the leaf could be executable.
*/
disallowed_hugepage_adjust(it, gw->gfn, &pfn, &hlevel);
if (nx_huge_page_workaround_enabled)
disallowed_hugepage_adjust(*it.sptep, gw->gfn, it.level,
&pfn, &level);
base_gfn = gw->gfn & ~(KVM_PAGES_PER_HPAGE(it.level) - 1);
if (it.level == hlevel)
if (it.level == level)
break;
validate_direct_spte(vcpu, it.sptep, direct_access);
@ -704,13 +710,16 @@ static int FNAME(fetch)(struct kvm_vcpu *vcpu, gpa_t addr,
sp = kvm_mmu_get_page(vcpu, base_gfn, addr,
it.level - 1, true, direct_access);
link_shadow_page(vcpu, it.sptep, sp);
if (lpage_disallowed)
if (huge_page_disallowed && req_level >= it.level)
account_huge_nx_page(vcpu->kvm, sp);
}
}
ret = mmu_set_spte(vcpu, it.sptep, gw->pte_access, write_fault,
it.level, base_gfn, pfn, prefault, map_writable);
if (ret == RET_PF_SPURIOUS)
return ret;
FNAME(pte_prefetch)(vcpu, gw, it.sptep);
++vcpu->stat.pf_fixed;
return ret;
@ -738,7 +747,7 @@ static int FNAME(fetch)(struct kvm_vcpu *vcpu, gpa_t addr,
*/
static bool
FNAME(is_self_change_mapping)(struct kvm_vcpu *vcpu,
struct guest_walker *walker, int user_fault,
struct guest_walker *walker, bool user_fault,
bool *write_fault_to_shadow_pgtable)
{
int level;
@ -776,15 +785,13 @@ FNAME(is_self_change_mapping)(struct kvm_vcpu *vcpu,
static int FNAME(page_fault)(struct kvm_vcpu *vcpu, gpa_t addr, u32 error_code,
bool prefault)
{
int write_fault = error_code & PFERR_WRITE_MASK;
int user_fault = error_code & PFERR_USER_MASK;
bool write_fault = error_code & PFERR_WRITE_MASK;
bool user_fault = error_code & PFERR_USER_MASK;
struct guest_walker walker;
int r;
kvm_pfn_t pfn;
unsigned long mmu_seq;
bool map_writable, is_self_change_mapping;
bool lpage_disallowed = (error_code & PFERR_FETCH_MASK) &&
is_nx_huge_page_enabled();
int max_level;
pgprintk("%s: addr %lx err %x\n", __func__, addr, error_code);
@ -825,7 +832,7 @@ static int FNAME(page_fault)(struct kvm_vcpu *vcpu, gpa_t addr, u32 error_code,
is_self_change_mapping = FNAME(is_self_change_mapping)(vcpu,
&walker, user_fault, &vcpu->arch.write_fault_to_shadow_pgtable);
if (lpage_disallowed || is_self_change_mapping)
if (is_self_change_mapping)
max_level = PG_LEVEL_4K;
else
max_level = walker.level;
@ -869,8 +876,8 @@ static int FNAME(page_fault)(struct kvm_vcpu *vcpu, gpa_t addr, u32 error_code,
r = make_mmu_pages_available(vcpu);
if (r)
goto out_unlock;
r = FNAME(fetch)(vcpu, addr, &walker, write_fault, max_level, pfn,
map_writable, prefault, lpage_disallowed);
r = FNAME(fetch)(vcpu, addr, &walker, error_code, max_level, pfn,
map_writable, prefault);
kvm_mmu_audit(vcpu, AUDIT_POST_PAGE_FAULT);
out_unlock:
@ -895,6 +902,7 @@ static void FNAME(invlpg)(struct kvm_vcpu *vcpu, gva_t gva, hpa_t root_hpa)
{
struct kvm_shadow_walk_iterator iterator;
struct kvm_mmu_page *sp;
u64 old_spte;
int level;
u64 *sptep;
@ -917,7 +925,8 @@ static void FNAME(invlpg)(struct kvm_vcpu *vcpu, gva_t gva, hpa_t root_hpa)
sptep = iterator.sptep;
sp = sptep_to_sp(sptep);
if (is_last_spte(*sptep, level)) {
old_spte = *sptep;
if (is_last_spte(old_spte, level)) {
pt_element_t gpte;
gpa_t pte_gpa;
@ -927,7 +936,8 @@ static void FNAME(invlpg)(struct kvm_vcpu *vcpu, gva_t gva, hpa_t root_hpa)
pte_gpa = FNAME(get_level1_sp_gpa)(sp);
pte_gpa += (sptep - sp->spt) * sizeof(pt_element_t);
if (mmu_page_zap_pte(vcpu->kvm, sp, sptep))
mmu_page_zap_pte(vcpu->kvm, sp, sptep, NULL);
if (is_shadow_present_pte(old_spte))
kvm_flush_remote_tlbs_with_address(vcpu->kvm,
sp->gfn, KVM_PAGES_PER_HPAGE(sp->role.level));

318
arch/x86/kvm/mmu/spte.c Normal file
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@ -0,0 +1,318 @@
// SPDX-License-Identifier: GPL-2.0-only
/*
* Kernel-based Virtual Machine driver for Linux
*
* Macros and functions to access KVM PTEs (also known as SPTEs)
*
* Copyright (C) 2006 Qumranet, Inc.
* Copyright 2020 Red Hat, Inc. and/or its affiliates.
*/
#include <linux/kvm_host.h>
#include "mmu.h"
#include "mmu_internal.h"
#include "x86.h"
#include "spte.h"
#include <asm/e820/api.h>
u64 __read_mostly shadow_nx_mask;
u64 __read_mostly shadow_x_mask; /* mutual exclusive with nx_mask */
u64 __read_mostly shadow_user_mask;
u64 __read_mostly shadow_accessed_mask;
u64 __read_mostly shadow_dirty_mask;
u64 __read_mostly shadow_mmio_value;
u64 __read_mostly shadow_mmio_access_mask;
u64 __read_mostly shadow_present_mask;
u64 __read_mostly shadow_me_mask;
u64 __read_mostly shadow_acc_track_mask;
u64 __read_mostly shadow_nonpresent_or_rsvd_mask;
u64 __read_mostly shadow_nonpresent_or_rsvd_lower_gfn_mask;
u8 __read_mostly shadow_phys_bits;
static u64 generation_mmio_spte_mask(u64 gen)
{
u64 mask;
WARN_ON(gen & ~MMIO_SPTE_GEN_MASK);
BUILD_BUG_ON((MMIO_SPTE_GEN_HIGH_MASK | MMIO_SPTE_GEN_LOW_MASK) & SPTE_SPECIAL_MASK);
mask = (gen << MMIO_SPTE_GEN_LOW_START) & MMIO_SPTE_GEN_LOW_MASK;
mask |= (gen << MMIO_SPTE_GEN_HIGH_START) & MMIO_SPTE_GEN_HIGH_MASK;
return mask;
}
u64 make_mmio_spte(struct kvm_vcpu *vcpu, u64 gfn, unsigned int access)
{
u64 gen = kvm_vcpu_memslots(vcpu)->generation & MMIO_SPTE_GEN_MASK;
u64 mask = generation_mmio_spte_mask(gen);
u64 gpa = gfn << PAGE_SHIFT;
access &= shadow_mmio_access_mask;
mask |= shadow_mmio_value | access;
mask |= gpa | shadow_nonpresent_or_rsvd_mask;
mask |= (gpa & shadow_nonpresent_or_rsvd_mask)
<< shadow_nonpresent_or_rsvd_mask_len;
return mask;
}
static bool kvm_is_mmio_pfn(kvm_pfn_t pfn)
{
if (pfn_valid(pfn))
return !is_zero_pfn(pfn) && PageReserved(pfn_to_page(pfn)) &&
/*
* Some reserved pages, such as those from NVDIMM
* DAX devices, are not for MMIO, and can be mapped
* with cached memory type for better performance.
* However, the above check misconceives those pages
* as MMIO, and results in KVM mapping them with UC
* memory type, which would hurt the performance.
* Therefore, we check the host memory type in addition
* and only treat UC/UC-/WC pages as MMIO.
*/
(!pat_enabled() || pat_pfn_immune_to_uc_mtrr(pfn));
return !e820__mapped_raw_any(pfn_to_hpa(pfn),
pfn_to_hpa(pfn + 1) - 1,
E820_TYPE_RAM);
}
int make_spte(struct kvm_vcpu *vcpu, unsigned int pte_access, int level,
gfn_t gfn, kvm_pfn_t pfn, u64 old_spte, bool speculative,
bool can_unsync, bool host_writable, bool ad_disabled,
u64 *new_spte)
{
u64 spte = 0;
int ret = 0;
if (ad_disabled)
spte |= SPTE_AD_DISABLED_MASK;
else if (kvm_vcpu_ad_need_write_protect(vcpu))
spte |= SPTE_AD_WRPROT_ONLY_MASK;
/*
* For the EPT case, shadow_present_mask is 0 if hardware
* supports exec-only page table entries. In that case,
* ACC_USER_MASK and shadow_user_mask are used to represent
* read access. See FNAME(gpte_access) in paging_tmpl.h.
*/
spte |= shadow_present_mask;
if (!speculative)
spte |= spte_shadow_accessed_mask(spte);
if (level > PG_LEVEL_4K && (pte_access & ACC_EXEC_MASK) &&
is_nx_huge_page_enabled()) {
pte_access &= ~ACC_EXEC_MASK;
}
if (pte_access & ACC_EXEC_MASK)
spte |= shadow_x_mask;
else
spte |= shadow_nx_mask;
if (pte_access & ACC_USER_MASK)
spte |= shadow_user_mask;
if (level > PG_LEVEL_4K)
spte |= PT_PAGE_SIZE_MASK;
if (tdp_enabled)
spte |= kvm_x86_ops.get_mt_mask(vcpu, gfn,
kvm_is_mmio_pfn(pfn));
if (host_writable)
spte |= SPTE_HOST_WRITEABLE;
else
pte_access &= ~ACC_WRITE_MASK;
if (!kvm_is_mmio_pfn(pfn))
spte |= shadow_me_mask;
spte |= (u64)pfn << PAGE_SHIFT;
if (pte_access & ACC_WRITE_MASK) {
spte |= PT_WRITABLE_MASK | SPTE_MMU_WRITEABLE;
/*
* Optimization: for pte sync, if spte was writable the hash
* lookup is unnecessary (and expensive). Write protection
* is responsibility of mmu_get_page / kvm_sync_page.
* Same reasoning can be applied to dirty page accounting.
*/
if (!can_unsync && is_writable_pte(old_spte))
goto out;
if (mmu_need_write_protect(vcpu, gfn, can_unsync)) {
pgprintk("%s: found shadow page for %llx, marking ro\n",
__func__, gfn);
ret |= SET_SPTE_WRITE_PROTECTED_PT;
pte_access &= ~ACC_WRITE_MASK;
spte &= ~(PT_WRITABLE_MASK | SPTE_MMU_WRITEABLE);
}
}
if (pte_access & ACC_WRITE_MASK)
spte |= spte_shadow_dirty_mask(spte);
if (speculative)
spte = mark_spte_for_access_track(spte);
out:
*new_spte = spte;
return ret;
}
u64 make_nonleaf_spte(u64 *child_pt, bool ad_disabled)
{
u64 spte;
spte = __pa(child_pt) | shadow_present_mask | PT_WRITABLE_MASK |
shadow_user_mask | shadow_x_mask | shadow_me_mask;
if (ad_disabled)
spte |= SPTE_AD_DISABLED_MASK;
else
spte |= shadow_accessed_mask;
return spte;
}
u64 kvm_mmu_changed_pte_notifier_make_spte(u64 old_spte, kvm_pfn_t new_pfn)
{
u64 new_spte;
new_spte = old_spte & ~PT64_BASE_ADDR_MASK;
new_spte |= (u64)new_pfn << PAGE_SHIFT;
new_spte &= ~PT_WRITABLE_MASK;
new_spte &= ~SPTE_HOST_WRITEABLE;
new_spte = mark_spte_for_access_track(new_spte);
return new_spte;
}
static u8 kvm_get_shadow_phys_bits(void)
{
/*
* boot_cpu_data.x86_phys_bits is reduced when MKTME or SME are detected
* in CPU detection code, but the processor treats those reduced bits as
* 'keyID' thus they are not reserved bits. Therefore KVM needs to look at
* the physical address bits reported by CPUID.
*/
if (likely(boot_cpu_data.extended_cpuid_level >= 0x80000008))
return cpuid_eax(0x80000008) & 0xff;
/*
* Quite weird to have VMX or SVM but not MAXPHYADDR; probably a VM with
* custom CPUID. Proceed with whatever the kernel found since these features
* aren't virtualizable (SME/SEV also require CPUIDs higher than 0x80000008).
*/
return boot_cpu_data.x86_phys_bits;
}
u64 mark_spte_for_access_track(u64 spte)
{
if (spte_ad_enabled(spte))
return spte & ~shadow_accessed_mask;
if (is_access_track_spte(spte))
return spte;
/*
* Making an Access Tracking PTE will result in removal of write access
* from the PTE. So, verify that we will be able to restore the write
* access in the fast page fault path later on.
*/
WARN_ONCE((spte & PT_WRITABLE_MASK) &&
!spte_can_locklessly_be_made_writable(spte),
"kvm: Writable SPTE is not locklessly dirty-trackable\n");
WARN_ONCE(spte & (shadow_acc_track_saved_bits_mask <<
shadow_acc_track_saved_bits_shift),
"kvm: Access Tracking saved bit locations are not zero\n");
spte |= (spte & shadow_acc_track_saved_bits_mask) <<
shadow_acc_track_saved_bits_shift;
spte &= ~shadow_acc_track_mask;
return spte;
}
void kvm_mmu_set_mmio_spte_mask(u64 mmio_value, u64 access_mask)
{
BUG_ON((u64)(unsigned)access_mask != access_mask);
WARN_ON(mmio_value & (shadow_nonpresent_or_rsvd_mask << shadow_nonpresent_or_rsvd_mask_len));
WARN_ON(mmio_value & shadow_nonpresent_or_rsvd_lower_gfn_mask);
shadow_mmio_value = mmio_value | SPTE_MMIO_MASK;
shadow_mmio_access_mask = access_mask;
}
EXPORT_SYMBOL_GPL(kvm_mmu_set_mmio_spte_mask);
/*
* Sets the shadow PTE masks used by the MMU.
*
* Assumptions:
* - Setting either @accessed_mask or @dirty_mask requires setting both
* - At least one of @accessed_mask or @acc_track_mask must be set
*/
void kvm_mmu_set_mask_ptes(u64 user_mask, u64 accessed_mask,
u64 dirty_mask, u64 nx_mask, u64 x_mask, u64 p_mask,
u64 acc_track_mask, u64 me_mask)
{
BUG_ON(!dirty_mask != !accessed_mask);
BUG_ON(!accessed_mask && !acc_track_mask);
BUG_ON(acc_track_mask & SPTE_SPECIAL_MASK);
shadow_user_mask = user_mask;
shadow_accessed_mask = accessed_mask;
shadow_dirty_mask = dirty_mask;
shadow_nx_mask = nx_mask;
shadow_x_mask = x_mask;
shadow_present_mask = p_mask;
shadow_acc_track_mask = acc_track_mask;
shadow_me_mask = me_mask;
}
EXPORT_SYMBOL_GPL(kvm_mmu_set_mask_ptes);
void kvm_mmu_reset_all_pte_masks(void)
{
u8 low_phys_bits;
shadow_user_mask = 0;
shadow_accessed_mask = 0;
shadow_dirty_mask = 0;
shadow_nx_mask = 0;
shadow_x_mask = 0;
shadow_present_mask = 0;
shadow_acc_track_mask = 0;
shadow_phys_bits = kvm_get_shadow_phys_bits();
/*
* If the CPU has 46 or less physical address bits, then set an
* appropriate mask to guard against L1TF attacks. Otherwise, it is
* assumed that the CPU is not vulnerable to L1TF.
*
* Some Intel CPUs address the L1 cache using more PA bits than are
* reported by CPUID. Use the PA width of the L1 cache when possible
* to achieve more effective mitigation, e.g. if system RAM overlaps
* the most significant bits of legal physical address space.
*/
shadow_nonpresent_or_rsvd_mask = 0;
low_phys_bits = boot_cpu_data.x86_phys_bits;
if (boot_cpu_has_bug(X86_BUG_L1TF) &&
!WARN_ON_ONCE(boot_cpu_data.x86_cache_bits >=
52 - shadow_nonpresent_or_rsvd_mask_len)) {
low_phys_bits = boot_cpu_data.x86_cache_bits
- shadow_nonpresent_or_rsvd_mask_len;
shadow_nonpresent_or_rsvd_mask =
rsvd_bits(low_phys_bits, boot_cpu_data.x86_cache_bits - 1);
}
shadow_nonpresent_or_rsvd_lower_gfn_mask =
GENMASK_ULL(low_phys_bits - 1, PAGE_SHIFT);
}

252
arch/x86/kvm/mmu/spte.h Normal file
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@ -0,0 +1,252 @@
// SPDX-License-Identifier: GPL-2.0-only
#ifndef KVM_X86_MMU_SPTE_H
#define KVM_X86_MMU_SPTE_H
#include "mmu_internal.h"
#define PT_FIRST_AVAIL_BITS_SHIFT 10
#define PT64_SECOND_AVAIL_BITS_SHIFT 54
/*
* The mask used to denote special SPTEs, which can be either MMIO SPTEs or
* Access Tracking SPTEs.
*/
#define SPTE_SPECIAL_MASK (3ULL << 52)
#define SPTE_AD_ENABLED_MASK (0ULL << 52)
#define SPTE_AD_DISABLED_MASK (1ULL << 52)
#define SPTE_AD_WRPROT_ONLY_MASK (2ULL << 52)
#define SPTE_MMIO_MASK (3ULL << 52)
#ifdef CONFIG_DYNAMIC_PHYSICAL_MASK
#define PT64_BASE_ADDR_MASK (physical_mask & ~(u64)(PAGE_SIZE-1))
#else
#define PT64_BASE_ADDR_MASK (((1ULL << 52) - 1) & ~(u64)(PAGE_SIZE-1))
#endif
#define PT64_LVL_ADDR_MASK(level) \
(PT64_BASE_ADDR_MASK & ~((1ULL << (PAGE_SHIFT + (((level) - 1) \
* PT64_LEVEL_BITS))) - 1))
#define PT64_LVL_OFFSET_MASK(level) \
(PT64_BASE_ADDR_MASK & ((1ULL << (PAGE_SHIFT + (((level) - 1) \
* PT64_LEVEL_BITS))) - 1))
#define PT64_PERM_MASK (PT_PRESENT_MASK | PT_WRITABLE_MASK | shadow_user_mask \
| shadow_x_mask | shadow_nx_mask | shadow_me_mask)
#define ACC_EXEC_MASK 1
#define ACC_WRITE_MASK PT_WRITABLE_MASK
#define ACC_USER_MASK PT_USER_MASK
#define ACC_ALL (ACC_EXEC_MASK | ACC_WRITE_MASK | ACC_USER_MASK)
/* The mask for the R/X bits in EPT PTEs */
#define PT64_EPT_READABLE_MASK 0x1ull
#define PT64_EPT_EXECUTABLE_MASK 0x4ull
#define PT64_LEVEL_BITS 9
#define PT64_LEVEL_SHIFT(level) \
(PAGE_SHIFT + (level - 1) * PT64_LEVEL_BITS)
#define PT64_INDEX(address, level)\
(((address) >> PT64_LEVEL_SHIFT(level)) & ((1 << PT64_LEVEL_BITS) - 1))
#define SHADOW_PT_INDEX(addr, level) PT64_INDEX(addr, level)
#define SPTE_HOST_WRITEABLE (1ULL << PT_FIRST_AVAIL_BITS_SHIFT)
#define SPTE_MMU_WRITEABLE (1ULL << (PT_FIRST_AVAIL_BITS_SHIFT + 1))
/*
* Due to limited space in PTEs, the MMIO generation is a 19 bit subset of
* the memslots generation and is derived as follows:
*
* Bits 0-8 of the MMIO generation are propagated to spte bits 3-11
* Bits 9-18 of the MMIO generation are propagated to spte bits 52-61
*
* The KVM_MEMSLOT_GEN_UPDATE_IN_PROGRESS flag is intentionally not included in
* the MMIO generation number, as doing so would require stealing a bit from
* the "real" generation number and thus effectively halve the maximum number
* of MMIO generations that can be handled before encountering a wrap (which
* requires a full MMU zap). The flag is instead explicitly queried when
* checking for MMIO spte cache hits.
*/
#define MMIO_SPTE_GEN_MASK GENMASK_ULL(17, 0)
#define MMIO_SPTE_GEN_LOW_START 3
#define MMIO_SPTE_GEN_LOW_END 11
#define MMIO_SPTE_GEN_LOW_MASK GENMASK_ULL(MMIO_SPTE_GEN_LOW_END, \
MMIO_SPTE_GEN_LOW_START)
#define MMIO_SPTE_GEN_HIGH_START PT64_SECOND_AVAIL_BITS_SHIFT
#define MMIO_SPTE_GEN_HIGH_END 62
#define MMIO_SPTE_GEN_HIGH_MASK GENMASK_ULL(MMIO_SPTE_GEN_HIGH_END, \
MMIO_SPTE_GEN_HIGH_START)
extern u64 __read_mostly shadow_nx_mask;
extern u64 __read_mostly shadow_x_mask; /* mutual exclusive with nx_mask */
extern u64 __read_mostly shadow_user_mask;
extern u64 __read_mostly shadow_accessed_mask;
extern u64 __read_mostly shadow_dirty_mask;
extern u64 __read_mostly shadow_mmio_value;
extern u64 __read_mostly shadow_mmio_access_mask;
extern u64 __read_mostly shadow_present_mask;
extern u64 __read_mostly shadow_me_mask;
/*
* SPTEs used by MMUs without A/D bits are marked with SPTE_AD_DISABLED_MASK;
* shadow_acc_track_mask is the set of bits to be cleared in non-accessed
* pages.
*/
extern u64 __read_mostly shadow_acc_track_mask;
/*
* This mask must be set on all non-zero Non-Present or Reserved SPTEs in order
* to guard against L1TF attacks.
*/
extern u64 __read_mostly shadow_nonpresent_or_rsvd_mask;
/*
* The mask/shift to use for saving the original R/X bits when marking the PTE
* as not-present for access tracking purposes. We do not save the W bit as the
* PTEs being access tracked also need to be dirty tracked, so the W bit will be
* restored only when a write is attempted to the page.
*/
static const u64 shadow_acc_track_saved_bits_mask = PT64_EPT_READABLE_MASK |
PT64_EPT_EXECUTABLE_MASK;
static const u64 shadow_acc_track_saved_bits_shift = PT64_SECOND_AVAIL_BITS_SHIFT;
/*
* The number of high-order 1 bits to use in the mask above.
*/
static const u64 shadow_nonpresent_or_rsvd_mask_len = 5;
/*
* In some cases, we need to preserve the GFN of a non-present or reserved
* SPTE when we usurp the upper five bits of the physical address space to
* defend against L1TF, e.g. for MMIO SPTEs. To preserve the GFN, we'll
* shift bits of the GFN that overlap with shadow_nonpresent_or_rsvd_mask
* left into the reserved bits, i.e. the GFN in the SPTE will be split into
* high and low parts. This mask covers the lower bits of the GFN.
*/
extern u64 __read_mostly shadow_nonpresent_or_rsvd_lower_gfn_mask;
/*
* The number of non-reserved physical address bits irrespective of features
* that repurpose legal bits, e.g. MKTME.
*/
extern u8 __read_mostly shadow_phys_bits;
static inline bool is_mmio_spte(u64 spte)
{
return (spte & SPTE_SPECIAL_MASK) == SPTE_MMIO_MASK;
}
static inline bool sp_ad_disabled(struct kvm_mmu_page *sp)
{
return sp->role.ad_disabled;
}
static inline bool spte_ad_enabled(u64 spte)
{
MMU_WARN_ON(is_mmio_spte(spte));
return (spte & SPTE_SPECIAL_MASK) != SPTE_AD_DISABLED_MASK;
}
static inline bool spte_ad_need_write_protect(u64 spte)
{
MMU_WARN_ON(is_mmio_spte(spte));
return (spte & SPTE_SPECIAL_MASK) != SPTE_AD_ENABLED_MASK;
}
static inline u64 spte_shadow_accessed_mask(u64 spte)
{
MMU_WARN_ON(is_mmio_spte(spte));
return spte_ad_enabled(spte) ? shadow_accessed_mask : 0;
}
static inline u64 spte_shadow_dirty_mask(u64 spte)
{
MMU_WARN_ON(is_mmio_spte(spte));
return spte_ad_enabled(spte) ? shadow_dirty_mask : 0;
}
static inline bool is_access_track_spte(u64 spte)
{
return !spte_ad_enabled(spte) && (spte & shadow_acc_track_mask) == 0;
}
static inline int is_shadow_present_pte(u64 pte)
{
return (pte != 0) && !is_mmio_spte(pte);
}
static inline int is_large_pte(u64 pte)
{
return pte & PT_PAGE_SIZE_MASK;
}
static inline int is_last_spte(u64 pte, int level)
{
if (level == PG_LEVEL_4K)
return 1;
if (is_large_pte(pte))
return 1;
return 0;
}
static inline bool is_executable_pte(u64 spte)
{
return (spte & (shadow_x_mask | shadow_nx_mask)) == shadow_x_mask;
}
static inline kvm_pfn_t spte_to_pfn(u64 pte)
{
return (pte & PT64_BASE_ADDR_MASK) >> PAGE_SHIFT;
}
static inline bool is_accessed_spte(u64 spte)
{
u64 accessed_mask = spte_shadow_accessed_mask(spte);
return accessed_mask ? spte & accessed_mask
: !is_access_track_spte(spte);
}
static inline bool is_dirty_spte(u64 spte)
{
u64 dirty_mask = spte_shadow_dirty_mask(spte);
return dirty_mask ? spte & dirty_mask : spte & PT_WRITABLE_MASK;
}
static inline bool spte_can_locklessly_be_made_writable(u64 spte)
{
return (spte & (SPTE_HOST_WRITEABLE | SPTE_MMU_WRITEABLE)) ==
(SPTE_HOST_WRITEABLE | SPTE_MMU_WRITEABLE);
}
static inline u64 get_mmio_spte_generation(u64 spte)
{
u64 gen;
gen = (spte & MMIO_SPTE_GEN_LOW_MASK) >> MMIO_SPTE_GEN_LOW_START;
gen |= (spte & MMIO_SPTE_GEN_HIGH_MASK) >> MMIO_SPTE_GEN_HIGH_START;
return gen;
}
/* Bits which may be returned by set_spte() */
#define SET_SPTE_WRITE_PROTECTED_PT BIT(0)
#define SET_SPTE_NEED_REMOTE_TLB_FLUSH BIT(1)
#define SET_SPTE_SPURIOUS BIT(2)
int make_spte(struct kvm_vcpu *vcpu, unsigned int pte_access, int level,
gfn_t gfn, kvm_pfn_t pfn, u64 old_spte, bool speculative,
bool can_unsync, bool host_writable, bool ad_disabled,
u64 *new_spte);
u64 make_nonleaf_spte(u64 *child_pt, bool ad_disabled);
u64 make_mmio_spte(struct kvm_vcpu *vcpu, u64 gfn, unsigned int access);
u64 mark_spte_for_access_track(u64 spte);
u64 kvm_mmu_changed_pte_notifier_make_spte(u64 old_spte, kvm_pfn_t new_pfn);
void kvm_mmu_reset_all_pte_masks(void);
#endif

182
arch/x86/kvm/mmu/tdp_iter.c Normal file
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@ -0,0 +1,182 @@
// SPDX-License-Identifier: GPL-2.0
#include "mmu_internal.h"
#include "tdp_iter.h"
#include "spte.h"
/*
* Recalculates the pointer to the SPTE for the current GFN and level and
* reread the SPTE.
*/
static void tdp_iter_refresh_sptep(struct tdp_iter *iter)
{
iter->sptep = iter->pt_path[iter->level - 1] +
SHADOW_PT_INDEX(iter->gfn << PAGE_SHIFT, iter->level);
iter->old_spte = READ_ONCE(*iter->sptep);
}
static gfn_t round_gfn_for_level(gfn_t gfn, int level)
{
return gfn & -KVM_PAGES_PER_HPAGE(level);
}
/*
* Sets a TDP iterator to walk a pre-order traversal of the paging structure
* rooted at root_pt, starting with the walk to translate goal_gfn.
*/
void tdp_iter_start(struct tdp_iter *iter, u64 *root_pt, int root_level,
int min_level, gfn_t goal_gfn)
{
WARN_ON(root_level < 1);
WARN_ON(root_level > PT64_ROOT_MAX_LEVEL);
iter->goal_gfn = goal_gfn;
iter->root_level = root_level;
iter->min_level = min_level;
iter->level = root_level;
iter->pt_path[iter->level - 1] = root_pt;
iter->gfn = round_gfn_for_level(iter->goal_gfn, iter->level);
tdp_iter_refresh_sptep(iter);
iter->valid = true;
}
/*
* Given an SPTE and its level, returns a pointer containing the host virtual
* address of the child page table referenced by the SPTE. Returns null if
* there is no such entry.
*/
u64 *spte_to_child_pt(u64 spte, int level)
{
/*
* There's no child entry if this entry isn't present or is a
* last-level entry.
*/
if (!is_shadow_present_pte(spte) || is_last_spte(spte, level))
return NULL;
return __va(spte_to_pfn(spte) << PAGE_SHIFT);
}
/*
* Steps down one level in the paging structure towards the goal GFN. Returns
* true if the iterator was able to step down a level, false otherwise.
*/
static bool try_step_down(struct tdp_iter *iter)
{
u64 *child_pt;
if (iter->level == iter->min_level)
return false;
/*
* Reread the SPTE before stepping down to avoid traversing into page
* tables that are no longer linked from this entry.
*/
iter->old_spte = READ_ONCE(*iter->sptep);
child_pt = spte_to_child_pt(iter->old_spte, iter->level);
if (!child_pt)
return false;
iter->level--;
iter->pt_path[iter->level - 1] = child_pt;
iter->gfn = round_gfn_for_level(iter->goal_gfn, iter->level);
tdp_iter_refresh_sptep(iter);
return true;
}
/*
* Steps to the next entry in the current page table, at the current page table
* level. The next entry could point to a page backing guest memory or another
* page table, or it could be non-present. Returns true if the iterator was
* able to step to the next entry in the page table, false if the iterator was
* already at the end of the current page table.
*/
static bool try_step_side(struct tdp_iter *iter)
{
/*
* Check if the iterator is already at the end of the current page
* table.
*/
if (SHADOW_PT_INDEX(iter->gfn << PAGE_SHIFT, iter->level) ==
(PT64_ENT_PER_PAGE - 1))
return false;
iter->gfn += KVM_PAGES_PER_HPAGE(iter->level);
iter->goal_gfn = iter->gfn;
iter->sptep++;
iter->old_spte = READ_ONCE(*iter->sptep);
return true;
}
/*
* Tries to traverse back up a level in the paging structure so that the walk
* can continue from the next entry in the parent page table. Returns true on a
* successful step up, false if already in the root page.
*/
static bool try_step_up(struct tdp_iter *iter)
{
if (iter->level == iter->root_level)
return false;
iter->level++;
iter->gfn = round_gfn_for_level(iter->gfn, iter->level);
tdp_iter_refresh_sptep(iter);
return true;
}
/*
* Step to the next SPTE in a pre-order traversal of the paging structure.
* To get to the next SPTE, the iterator either steps down towards the goal
* GFN, if at a present, non-last-level SPTE, or over to a SPTE mapping a
* highter GFN.
*
* The basic algorithm is as follows:
* 1. If the current SPTE is a non-last-level SPTE, step down into the page
* table it points to.
* 2. If the iterator cannot step down, it will try to step to the next SPTE
* in the current page of the paging structure.
* 3. If the iterator cannot step to the next entry in the current page, it will
* try to step up to the parent paging structure page. In this case, that
* SPTE will have already been visited, and so the iterator must also step
* to the side again.
*/
void tdp_iter_next(struct tdp_iter *iter)
{
if (try_step_down(iter))
return;
do {
if (try_step_side(iter))
return;
} while (try_step_up(iter));
iter->valid = false;
}
/*
* Restart the walk over the paging structure from the root, starting from the
* highest gfn the iterator had previously reached. Assumes that the entire
* paging structure, except the root page, may have been completely torn down
* and rebuilt.
*/
void tdp_iter_refresh_walk(struct tdp_iter *iter)
{
gfn_t goal_gfn = iter->goal_gfn;
if (iter->gfn > goal_gfn)
goal_gfn = iter->gfn;
tdp_iter_start(iter, iter->pt_path[iter->root_level - 1],
iter->root_level, iter->min_level, goal_gfn);
}
u64 *tdp_iter_root_pt(struct tdp_iter *iter)
{
return iter->pt_path[iter->root_level - 1];
}

60
arch/x86/kvm/mmu/tdp_iter.h Normal file
View File

@ -0,0 +1,60 @@
// SPDX-License-Identifier: GPL-2.0
#ifndef __KVM_X86_MMU_TDP_ITER_H
#define __KVM_X86_MMU_TDP_ITER_H
#include <linux/kvm_host.h>
#include "mmu.h"
/*
* A TDP iterator performs a pre-order walk over a TDP paging structure.
*/
struct tdp_iter {
/*
* The iterator will traverse the paging structure towards the mapping
* for this GFN.
*/
gfn_t goal_gfn;
/* Pointers to the page tables traversed to reach the current SPTE */
u64 *pt_path[PT64_ROOT_MAX_LEVEL];
/* A pointer to the current SPTE */
u64 *sptep;
/* The lowest GFN mapped by the current SPTE */
gfn_t gfn;
/* The level of the root page given to the iterator */
int root_level;
/* The lowest level the iterator should traverse to */
int min_level;
/* The iterator's current level within the paging structure */
int level;
/* A snapshot of the value at sptep */
u64 old_spte;
/*
* Whether the iterator has a valid state. This will be false if the
* iterator walks off the end of the paging structure.
*/
bool valid;
};
/*
* Iterates over every SPTE mapping the GFN range [start, end) in a
* preorder traversal.
*/
#define for_each_tdp_pte_min_level(iter, root, root_level, min_level, start, end) \
for (tdp_iter_start(&iter, root, root_level, min_level, start); \
iter.valid && iter.gfn < end; \
tdp_iter_next(&iter))
#define for_each_tdp_pte(iter, root, root_level, start, end) \
for_each_tdp_pte_min_level(iter, root, root_level, PG_LEVEL_4K, start, end)
u64 *spte_to_child_pt(u64 pte, int level);
void tdp_iter_start(struct tdp_iter *iter, u64 *root_pt, int root_level,
int min_level, gfn_t goal_gfn);
void tdp_iter_next(struct tdp_iter *iter);
void tdp_iter_refresh_walk(struct tdp_iter *iter);
u64 *tdp_iter_root_pt(struct tdp_iter *iter);
#endif /* __KVM_X86_MMU_TDP_ITER_H */

1157
arch/x86/kvm/mmu/tdp_mmu.c Normal file
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File diff suppressed because it is too large Load Diff

48
arch/x86/kvm/mmu/tdp_mmu.h Normal file
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@ -0,0 +1,48 @@
// SPDX-License-Identifier: GPL-2.0
#ifndef __KVM_X86_MMU_TDP_MMU_H
#define __KVM_X86_MMU_TDP_MMU_H
#include <linux/kvm_host.h>
void kvm_mmu_init_tdp_mmu(struct kvm *kvm);
void kvm_mmu_uninit_tdp_mmu(struct kvm *kvm);
bool is_tdp_mmu_root(struct kvm *kvm, hpa_t root);
hpa_t kvm_tdp_mmu_get_vcpu_root_hpa(struct kvm_vcpu *vcpu);
void kvm_tdp_mmu_free_root(struct kvm *kvm, struct kvm_mmu_page *root);
bool kvm_tdp_mmu_zap_gfn_range(struct kvm *kvm, gfn_t start, gfn_t end);
void kvm_tdp_mmu_zap_all(struct kvm *kvm);
int kvm_tdp_mmu_map(struct kvm_vcpu *vcpu, gpa_t gpa, u32 error_code,
int map_writable, int max_level, kvm_pfn_t pfn,
bool prefault);
int kvm_tdp_mmu_zap_hva_range(struct kvm *kvm, unsigned long start,
unsigned long end);
int kvm_tdp_mmu_age_hva_range(struct kvm *kvm, unsigned long start,
unsigned long end);
int kvm_tdp_mmu_test_age_hva(struct kvm *kvm, unsigned long hva);
int kvm_tdp_mmu_set_spte_hva(struct kvm *kvm, unsigned long address,
pte_t *host_ptep);
bool kvm_tdp_mmu_wrprot_slot(struct kvm *kvm, struct kvm_memory_slot *slot,
int min_level);
bool kvm_tdp_mmu_clear_dirty_slot(struct kvm *kvm,
struct kvm_memory_slot *slot);
void kvm_tdp_mmu_clear_dirty_pt_masked(struct kvm *kvm,
struct kvm_memory_slot *slot,
gfn_t gfn, unsigned long mask,
bool wrprot);
bool kvm_tdp_mmu_slot_set_dirty(struct kvm *kvm, struct kvm_memory_slot *slot);
void kvm_tdp_mmu_zap_collapsible_sptes(struct kvm *kvm,
const struct kvm_memory_slot *slot);
bool kvm_tdp_mmu_write_protect_gfn(struct kvm *kvm,
struct kvm_memory_slot *slot, gfn_t gfn);
int kvm_tdp_mmu_get_walk(struct kvm_vcpu *vcpu, u64 addr, u64 *sptes);
#endif /* __KVM_X86_MMU_TDP_MMU_H */

7
arch/x86/kvm/svm/avic.c
View File

@ -153,20 +153,18 @@ int avic_vm_init(struct kvm *kvm)
return 0;
/* Allocating physical APIC ID table (4KB) */
p_page = alloc_page(GFP_KERNEL_ACCOUNT);
p_page = alloc_page(GFP_KERNEL_ACCOUNT | __GFP_ZERO);
if (!p_page)
goto free_avic;
kvm_svm->avic_physical_id_table_page = p_page;
clear_page(page_address(p_page));
/* Allocating logical APIC ID table (4KB) */
l_page = alloc_page(GFP_KERNEL_ACCOUNT);
l_page = alloc_page(GFP_KERNEL_ACCOUNT | __GFP_ZERO);
if (!l_page)
goto free_avic;
kvm_svm->avic_logical_id_table_page = l_page;
clear_page(page_address(l_page));
spin_lock_irqsave(&svm_vm_data_hash_lock, flags);
again:
@ -868,6 +866,7 @@ int svm_update_pi_irte(struct kvm *kvm, unsigned int host_irq,
* - Tell IOMMU to use legacy mode for this interrupt.
* - Retrieve ga_tag of prior interrupt remapping data.
*/
pi.prev_ga_tag = 0;
pi.is_guest_mode = false;
ret = irq_set_vcpu_affinity(host_irq, &pi);

347
arch/x86/kvm/svm/nested.c
View File

@ -98,6 +98,7 @@ static void nested_svm_uninit_mmu_context(struct kvm_vcpu *vcpu)
void recalc_intercepts(struct vcpu_svm *svm)
{
struct vmcb_control_area *c, *h, *g;
unsigned int i;
vmcb_mark_dirty(svm->vmcb, VMCB_INTERCEPTS);
@ -108,42 +109,37 @@ void recalc_intercepts(struct vcpu_svm *svm)
h = &svm->nested.hsave->control;
g = &svm->nested.ctl;
svm->nested.host_intercept_exceptions = h->intercept_exceptions;
c->intercept_cr = h->intercept_cr;
c->intercept_dr = h->intercept_dr;
c->intercept_exceptions = h->intercept_exceptions;
c->intercept = h->intercept;
for (i = 0; i < MAX_INTERCEPT; i++)
c->intercepts[i] = h->intercepts[i];
if (g->int_ctl & V_INTR_MASKING_MASK) {
/* We only want the cr8 intercept bits of L1 */
c->intercept_cr &= ~(1U << INTERCEPT_CR8_READ);
c->intercept_cr &= ~(1U << INTERCEPT_CR8_WRITE);
vmcb_clr_intercept(c, INTERCEPT_CR8_READ);
vmcb_clr_intercept(c, INTERCEPT_CR8_WRITE);
/*
* Once running L2 with HF_VINTR_MASK, EFLAGS.IF does not
* affect any interrupt we may want to inject; therefore,
* interrupt window vmexits are irrelevant to L0.
*/
c->intercept &= ~(1ULL << INTERCEPT_VINTR);
vmcb_clr_intercept(c, INTERCEPT_VINTR);
}
/* We don't want to see VMMCALLs from a nested guest */
c->intercept &= ~(1ULL << INTERCEPT_VMMCALL);
vmcb_clr_intercept(c, INTERCEPT_VMMCALL);
c->intercept_cr |= g->intercept_cr;
c->intercept_dr |= g->intercept_dr;
c->intercept_exceptions |= g->intercept_exceptions;
c->intercept |= g->intercept;
for (i = 0; i < MAX_INTERCEPT; i++)
c->intercepts[i] |= g->intercepts[i];
}
static void copy_vmcb_control_area(struct vmcb_control_area *dst,
struct vmcb_control_area *from)
{
dst->intercept_cr = from->intercept_cr;
dst->intercept_dr = from->intercept_dr;
dst->intercept_exceptions = from->intercept_exceptions;
dst->intercept = from->intercept;
unsigned int i;
for (i = 0; i < MAX_INTERCEPT; i++)
dst->intercepts[i] = from->intercepts[i];
dst->iopm_base_pa = from->iopm_base_pa;
dst->msrpm_base_pa = from->msrpm_base_pa;
dst->tsc_offset = from->tsc_offset;
@ -176,7 +172,7 @@ static bool nested_svm_vmrun_msrpm(struct vcpu_svm *svm)
*/
int i;
if (!(svm->nested.ctl.intercept & (1ULL << INTERCEPT_MSR_PROT)))
if (!(vmcb_is_intercept(&svm->nested.ctl, INTERCEPT_MSR_PROT)))
return true;
for (i = 0; i < MSRPM_OFFSETS; i++) {
@ -200,9 +196,23 @@ static bool nested_svm_vmrun_msrpm(struct vcpu_svm *svm)
return true;
}
static bool svm_get_nested_state_pages(struct kvm_vcpu *vcpu)
{
struct vcpu_svm *svm = to_svm(vcpu);
if (!nested_svm_vmrun_msrpm(svm)) {
vcpu->run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
vcpu->run->internal.suberror =
KVM_INTERNAL_ERROR_EMULATION;
vcpu->run->internal.ndata = 0;
return false;
}
return true;
}
static bool nested_vmcb_check_controls(struct vmcb_control_area *control)
{
if ((control->intercept & (1ULL << INTERCEPT_VMRUN)) == 0)
if ((vmcb_is_intercept(control, INTERCEPT_VMRUN)) == 0)
return false;
if (control->asid == 0)
@ -215,41 +225,39 @@ static bool nested_vmcb_check_controls(struct vmcb_control_area *control)
return true;
}
static bool nested_vmcb_checks(struct vcpu_svm *svm, struct vmcb *vmcb)
static bool nested_vmcb_checks(struct vcpu_svm *svm, struct vmcb *vmcb12)
{
bool nested_vmcb_lma;
if ((vmcb->save.efer & EFER_SVME) == 0)
bool vmcb12_lma;
if ((vmcb12->save.efer & EFER_SVME) == 0)
return false;
if (((vmcb->save.cr0 & X86_CR0_CD) == 0) &&
(vmcb->save.cr0 & X86_CR0_NW))
if (((vmcb12->save.cr0 & X86_CR0_CD) == 0) && (vmcb12->save.cr0 & X86_CR0_NW))
return false;
if (!kvm_dr6_valid(vmcb->save.dr6) || !kvm_dr7_valid(vmcb->save.dr7))
if (!kvm_dr6_valid(vmcb12->save.dr6) || !kvm_dr7_valid(vmcb12->save.dr7))
return false;
nested_vmcb_lma =
(vmcb->save.efer & EFER_LME) &&
(vmcb->save.cr0 & X86_CR0_PG);
vmcb12_lma = (vmcb12->save.efer & EFER_LME) && (vmcb12->save.cr0 & X86_CR0_PG);
if (!nested_vmcb_lma) {
if (vmcb->save.cr4 & X86_CR4_PAE) {
if (vmcb->save.cr3 & MSR_CR3_LEGACY_PAE_RESERVED_MASK)
if (!vmcb12_lma) {
if (vmcb12->save.cr4 & X86_CR4_PAE) {
if (vmcb12->save.cr3 & MSR_CR3_LEGACY_PAE_RESERVED_MASK)
return false;
} else {
if (vmcb->save.cr3 & MSR_CR3_LEGACY_RESERVED_MASK)
if (vmcb12->save.cr3 & MSR_CR3_LEGACY_RESERVED_MASK)
return false;
}
} else {
if (!(vmcb->save.cr4 & X86_CR4_PAE) ||
!(vmcb->save.cr0 & X86_CR0_PE) ||
(vmcb->save.cr3 & MSR_CR3_LONG_RESERVED_MASK))
if (!(vmcb12->save.cr4 & X86_CR4_PAE) ||
!(vmcb12->save.cr0 & X86_CR0_PE) ||
(vmcb12->save.cr3 & MSR_CR3_LONG_MBZ_MASK))
return false;
}
if (kvm_valid_cr4(&svm->vcpu, vmcb->save.cr4))
if (kvm_valid_cr4(&svm->vcpu, vmcb12->save.cr4))
return false;
return nested_vmcb_check_controls(&vmcb->control);
return nested_vmcb_check_controls(&vmcb12->control);
}
static void load_nested_vmcb_control(struct vcpu_svm *svm,
@ -296,7 +304,7 @@ void sync_nested_vmcb_control(struct vcpu_svm *svm)
* EXIT_INT_INFO.
*/
static void nested_vmcb_save_pending_event(struct vcpu_svm *svm,
struct vmcb *nested_vmcb)
struct vmcb *vmcb12)
{
struct kvm_vcpu *vcpu = &svm->vcpu;
u32 exit_int_info = 0;
@ -308,7 +316,7 @@ static void nested_vmcb_save_pending_event(struct vcpu_svm *svm,
if (vcpu->arch.exception.has_error_code) {
exit_int_info |= SVM_EVTINJ_VALID_ERR;
nested_vmcb->control.exit_int_info_err =
vmcb12->control.exit_int_info_err =
vcpu->arch.exception.error_code;
}
@ -325,7 +333,7 @@ static void nested_vmcb_save_pending_event(struct vcpu_svm *svm,
exit_int_info |= SVM_EVTINJ_TYPE_INTR;
}
nested_vmcb->control.exit_int_info = exit_int_info;
vmcb12->control.exit_int_info = exit_int_info;
}
static inline bool nested_npt_enabled(struct vcpu_svm *svm)
@ -364,31 +372,31 @@ static int nested_svm_load_cr3(struct kvm_vcpu *vcpu, unsigned long cr3,
return 0;
}
static void nested_prepare_vmcb_save(struct vcpu_svm *svm, struct vmcb *nested_vmcb)
static void nested_prepare_vmcb_save(struct vcpu_svm *svm, struct vmcb *vmcb12)
{
/* Load the nested guest state */
svm->vmcb->save.es = nested_vmcb->save.es;
svm->vmcb->save.cs = nested_vmcb->save.cs;
svm->vmcb->save.ss = nested_vmcb->save.ss;
svm->vmcb->save.ds = nested_vmcb->save.ds;
svm->vmcb->save.gdtr = nested_vmcb->save.gdtr;
svm->vmcb->save.idtr = nested_vmcb->save.idtr;
kvm_set_rflags(&svm->vcpu, nested_vmcb->save.rflags);
svm_set_efer(&svm->vcpu, nested_vmcb->save.efer);
svm_set_cr0(&svm->vcpu, nested_vmcb->save.cr0);
svm_set_cr4(&svm->vcpu, nested_vmcb->save.cr4);
svm->vmcb->save.cr2 = svm->vcpu.arch.cr2 = nested_vmcb->save.cr2;
kvm_rax_write(&svm->vcpu, nested_vmcb->save.rax);
kvm_rsp_write(&svm->vcpu, nested_vmcb->save.rsp);
kvm_rip_write(&svm->vcpu, nested_vmcb->save.rip);
svm->vmcb->save.es = vmcb12->save.es;
svm->vmcb->save.cs = vmcb12->save.cs;
svm->vmcb->save.ss = vmcb12->save.ss;
svm->vmcb->save.ds = vmcb12->save.ds;
svm->vmcb->save.gdtr = vmcb12->save.gdtr;
svm->vmcb->save.idtr = vmcb12->save.idtr;
kvm_set_rflags(&svm->vcpu, vmcb12->save.rflags);
svm_set_efer(&svm->vcpu, vmcb12->save.efer);
svm_set_cr0(&svm->vcpu, vmcb12->save.cr0);
svm_set_cr4(&svm->vcpu, vmcb12->save.cr4);
svm->vmcb->save.cr2 = svm->vcpu.arch.cr2 = vmcb12->save.cr2;
kvm_rax_write(&svm->vcpu, vmcb12->save.rax);
kvm_rsp_write(&svm->vcpu, vmcb12->save.rsp);
kvm_rip_write(&svm->vcpu, vmcb12->save.rip);
/* In case we don't even reach vcpu_run, the fields are not updated */
svm->vmcb->save.rax = nested_vmcb->save.rax;
svm->vmcb->save.rsp = nested_vmcb->save.rsp;
svm->vmcb->save.rip = nested_vmcb->save.rip;
svm->vmcb->save.dr7 = nested_vmcb->save.dr7;
svm->vcpu.arch.dr6 = nested_vmcb->save.dr6;
svm->vmcb->save.cpl = nested_vmcb->save.cpl;
svm->vmcb->save.rax = vmcb12->save.rax;
svm->vmcb->save.rsp = vmcb12->save.rsp;
svm->vmcb->save.rip = vmcb12->save.rip;
svm->vmcb->save.dr7 = vmcb12->save.dr7;
svm->vcpu.arch.dr6 = vmcb12->save.dr6;
svm->vmcb->save.cpl = vmcb12->save.cpl;
}
static void nested_prepare_vmcb_control(struct vcpu_svm *svm)
@ -426,17 +434,17 @@ static void nested_prepare_vmcb_control(struct vcpu_svm *svm)
vmcb_mark_all_dirty(svm->vmcb);
}
int enter_svm_guest_mode(struct vcpu_svm *svm, u64 vmcb_gpa,
struct vmcb *nested_vmcb)
int enter_svm_guest_mode(struct vcpu_svm *svm, u64 vmcb12_gpa,
struct vmcb *vmcb12)
{
int ret;
svm->nested.vmcb = vmcb_gpa;
load_nested_vmcb_control(svm, &nested_vmcb->control);
nested_prepare_vmcb_save(svm, nested_vmcb);
svm->nested.vmcb12_gpa = vmcb12_gpa;
load_nested_vmcb_control(svm, &vmcb12->control);
nested_prepare_vmcb_save(svm, vmcb12);
nested_prepare_vmcb_control(svm);
ret = nested_svm_load_cr3(&svm->vcpu, nested_vmcb->save.cr3,
ret = nested_svm_load_cr3(&svm->vcpu, vmcb12->save.cr3,
nested_npt_enabled(svm));
if (ret)
return ret;
@ -449,19 +457,19 @@ int enter_svm_guest_mode(struct vcpu_svm *svm, u64 vmcb_gpa,
int nested_svm_vmrun(struct vcpu_svm *svm)
{
int ret;
struct vmcb *nested_vmcb;
struct vmcb *vmcb12;
struct vmcb *hsave = svm->nested.hsave;
struct vmcb *vmcb = svm->vmcb;
struct kvm_host_map map;
u64 vmcb_gpa;
u64 vmcb12_gpa;
if (is_smm(&svm->vcpu)) {
kvm_queue_exception(&svm->vcpu, UD_VECTOR);
return 1;
}
vmcb_gpa = svm->vmcb->save.rax;
ret = kvm_vcpu_map(&svm->vcpu, gpa_to_gfn(vmcb_gpa), &map);
vmcb12_gpa = svm->vmcb->save.rax;
ret = kvm_vcpu_map(&svm->vcpu, gpa_to_gfn(vmcb12_gpa), &map);
if (ret == -EINVAL) {
kvm_inject_gp(&svm->vcpu, 0);
return 1;
@ -471,26 +479,31 @@ int nested_svm_vmrun(struct vcpu_svm *svm)
ret = kvm_skip_emulated_instruction(&svm->vcpu);
nested_vmcb = map.hva;
vmcb12 = map.hva;
if (!nested_vmcb_checks(svm, nested_vmcb)) {
nested_vmcb->control.exit_code = SVM_EXIT_ERR;
nested_vmcb->control.exit_code_hi = 0;
nested_vmcb->control.exit_info_1 = 0;
nested_vmcb->control.exit_info_2 = 0;
if (WARN_ON_ONCE(!svm->nested.initialized))
return -EINVAL;
if (!nested_vmcb_checks(svm, vmcb12)) {
vmcb12->control.exit_code = SVM_EXIT_ERR;
vmcb12->control.exit_code_hi = 0;
vmcb12->control.exit_info_1 = 0;
vmcb12->control.exit_info_2 = 0;
goto out;
}
trace_kvm_nested_vmrun(svm->vmcb->save.rip, vmcb_gpa,
nested_vmcb->save.rip,
nested_vmcb->control.int_ctl,
nested_vmcb->control.event_inj,
nested_vmcb->control.nested_ctl);
trace_kvm_nested_vmrun(svm->vmcb->save.rip, vmcb12_gpa,
vmcb12->save.rip,
vmcb12->control.int_ctl,
vmcb12->control.event_inj,
vmcb12->control.nested_ctl);
trace_kvm_nested_intercepts(nested_vmcb->control.intercept_cr & 0xffff,
nested_vmcb->control.intercept_cr >> 16,
nested_vmcb->control.intercept_exceptions,
nested_vmcb->control.intercept);
trace_kvm_nested_intercepts(vmcb12->control.intercepts[INTERCEPT_CR] & 0xffff,
vmcb12->control.intercepts[INTERCEPT_CR] >> 16,
vmcb12->control.intercepts[INTERCEPT_EXCEPTION],
vmcb12->control.intercepts[INTERCEPT_WORD3],
vmcb12->control.intercepts[INTERCEPT_WORD4],
vmcb12->control.intercepts[INTERCEPT_WORD5]);
/* Clear internal status */
kvm_clear_exception_queue(&svm->vcpu);
@ -522,7 +535,7 @@ int nested_svm_vmrun(struct vcpu_svm *svm)
svm->nested.nested_run_pending = 1;
if (enter_svm_guest_mode(svm, vmcb_gpa, nested_vmcb))
if (enter_svm_guest_mode(svm, vmcb12_gpa, vmcb12))
goto out_exit_err;
if (nested_svm_vmrun_msrpm(svm))
@ -563,23 +576,23 @@ void nested_svm_vmloadsave(struct vmcb *from_vmcb, struct vmcb *to_vmcb)
int nested_svm_vmexit(struct vcpu_svm *svm)
{
int rc;
struct vmcb *nested_vmcb;
struct vmcb *vmcb12;
struct vmcb *hsave = svm->nested.hsave;
struct vmcb *vmcb = svm->vmcb;
struct kvm_host_map map;
rc = kvm_vcpu_map(&svm->vcpu, gpa_to_gfn(svm->nested.vmcb), &map);
rc = kvm_vcpu_map(&svm->vcpu, gpa_to_gfn(svm->nested.vmcb12_gpa), &map);
if (rc) {
if (rc == -EINVAL)
kvm_inject_gp(&svm->vcpu, 0);
return 1;
}
nested_vmcb = map.hva;
vmcb12 = map.hva;
/* Exit Guest-Mode */
leave_guest_mode(&svm->vcpu);
svm->nested.vmcb = 0;
svm->nested.vmcb12_gpa = 0;
WARN_ON_ONCE(svm->nested.nested_run_pending);
/* in case we halted in L2 */
@ -587,45 +600,45 @@ int nested_svm_vmexit(struct vcpu_svm *svm)
/* Give the current vmcb to the guest */
nested_vmcb->save.es = vmcb->save.es;
nested_vmcb->save.cs = vmcb->save.cs;
nested_vmcb->save.ss = vmcb->save.ss;
nested_vmcb->save.ds = vmcb->save.ds;
nested_vmcb->save.gdtr = vmcb->save.gdtr;
nested_vmcb->save.idtr = vmcb->save.idtr;
nested_vmcb->save.efer = svm->vcpu.arch.efer;
nested_vmcb->save.cr0 = kvm_read_cr0(&svm->vcpu);
nested_vmcb->save.cr3 = kvm_read_cr3(&svm->vcpu);
nested_vmcb->save.cr2 = vmcb->save.cr2;
nested_vmcb->save.cr4 = svm->vcpu.arch.cr4;
nested_vmcb->save.rflags = kvm_get_rflags(&svm->vcpu);
nested_vmcb->save.rip = kvm_rip_read(&svm->vcpu);
nested_vmcb->save.rsp = kvm_rsp_read(&svm->vcpu);
nested_vmcb->save.rax = kvm_rax_read(&svm->vcpu);
nested_vmcb->save.dr7 = vmcb->save.dr7;
nested_vmcb->save.dr6 = svm->vcpu.arch.dr6;
nested_vmcb->save.cpl = vmcb->save.cpl;
vmcb12->save.es = vmcb->save.es;
vmcb12->save.cs = vmcb->save.cs;
vmcb12->save.ss = vmcb->save.ss;
vmcb12->save.ds = vmcb->save.ds;
vmcb12->save.gdtr = vmcb->save.gdtr;
vmcb12->save.idtr = vmcb->save.idtr;
vmcb12->save.efer = svm->vcpu.arch.efer;
vmcb12->save.cr0 = kvm_read_cr0(&svm->vcpu);
vmcb12->save.cr3 = kvm_read_cr3(&svm->vcpu);
vmcb12->save.cr2 = vmcb->save.cr2;
vmcb12->save.cr4 = svm->vcpu.arch.cr4;
vmcb12->save.rflags = kvm_get_rflags(&svm->vcpu);
vmcb12->save.rip = kvm_rip_read(&svm->vcpu);
vmcb12->save.rsp = kvm_rsp_read(&svm->vcpu);
vmcb12->save.rax = kvm_rax_read(&svm->vcpu);
vmcb12->save.dr7 = vmcb->save.dr7;
vmcb12->save.dr6 = svm->vcpu.arch.dr6;
vmcb12->save.cpl = vmcb->save.cpl;
nested_vmcb->control.int_state = vmcb->control.int_state;
nested_vmcb->control.exit_code = vmcb->control.exit_code;
nested_vmcb->control.exit_code_hi = vmcb->control.exit_code_hi;
nested_vmcb->control.exit_info_1 = vmcb->control.exit_info_1;
nested_vmcb->control.exit_info_2 = vmcb->control.exit_info_2;
vmcb12->control.int_state = vmcb->control.int_state;
vmcb12->control.exit_code = vmcb->control.exit_code;
vmcb12->control.exit_code_hi = vmcb->control.exit_code_hi;
vmcb12->control.exit_info_1 = vmcb->control.exit_info_1;
vmcb12->control.exit_info_2 = vmcb->control.exit_info_2;
if (nested_vmcb->control.exit_code != SVM_EXIT_ERR)
nested_vmcb_save_pending_event(svm, nested_vmcb);
if (vmcb12->control.exit_code != SVM_EXIT_ERR)
nested_vmcb_save_pending_event(svm, vmcb12);
if (svm->nrips_enabled)
nested_vmcb->control.next_rip = vmcb->control.next_rip;
vmcb12->control.next_rip = vmcb->control.next_rip;
nested_vmcb->control.int_ctl = svm->nested.ctl.int_ctl;
nested_vmcb->control.tlb_ctl = svm->nested.ctl.tlb_ctl;
nested_vmcb->control.event_inj = svm->nested.ctl.event_inj;
nested_vmcb->control.event_inj_err = svm->nested.ctl.event_inj_err;
vmcb12->control.int_ctl = svm->nested.ctl.int_ctl;
vmcb12->control.tlb_ctl = svm->nested.ctl.tlb_ctl;
vmcb12->control.event_inj = svm->nested.ctl.event_inj;
vmcb12->control.event_inj_err = svm->nested.ctl.event_inj_err;
nested_vmcb->control.pause_filter_count =
vmcb12->control.pause_filter_count =
svm->vmcb->control.pause_filter_count;
nested_vmcb->control.pause_filter_thresh =
vmcb12->control.pause_filter_thresh =
svm->vmcb->control.pause_filter_thresh;
/* Restore the original control entries */
@ -659,11 +672,11 @@ int nested_svm_vmexit(struct vcpu_svm *svm)
vmcb_mark_all_dirty(svm->vmcb);
trace_kvm_nested_vmexit_inject(nested_vmcb->control.exit_code,
nested_vmcb->control.exit_info_1,
nested_vmcb->control.exit_info_2,
nested_vmcb->control.exit_int_info,
nested_vmcb->control.exit_int_info_err,
trace_kvm_nested_vmexit_inject(vmcb12->control.exit_code,
vmcb12->control.exit_info_1,
vmcb12->control.exit_info_2,
vmcb12->control.exit_int_info,
vmcb12->control.exit_int_info_err,
KVM_ISA_SVM);
kvm_vcpu_unmap(&svm->vcpu, &map, true);
@ -688,6 +701,45 @@ int nested_svm_vmexit(struct vcpu_svm *svm)
return 0;
}
int svm_allocate_nested(struct vcpu_svm *svm)
{
struct page *hsave_page;
if (svm->nested.initialized)
return 0;
hsave_page = alloc_page(GFP_KERNEL_ACCOUNT | __GFP_ZERO);
if (!hsave_page)
return -ENOMEM;
svm->nested.hsave = page_address(hsave_page);
svm->nested.msrpm = svm_vcpu_alloc_msrpm();
if (!svm->nested.msrpm)
goto err_free_hsave;
svm_vcpu_init_msrpm(&svm->vcpu, svm->nested.msrpm);
svm->nested.initialized = true;
return 0;
err_free_hsave:
__free_page(hsave_page);
return -ENOMEM;
}
void svm_free_nested(struct vcpu_svm *svm)
{
if (!svm->nested.initialized)
return;
svm_vcpu_free_msrpm(svm->nested.msrpm);
svm->nested.msrpm = NULL;
__free_page(virt_to_page(svm->nested.hsave));
svm->nested.hsave = NULL;
svm->nested.initialized = false;
}
/*
* Forcibly leave nested mode in order to be able to reset the VCPU later on.
*/
@ -702,6 +754,8 @@ void svm_leave_nested(struct vcpu_svm *svm)
copy_vmcb_control_area(&vmcb->control, &hsave->control);
nested_svm_uninit_mmu_context(&svm->vcpu);
}
kvm_clear_request(KVM_REQ_GET_NESTED_STATE_PAGES, &svm->vcpu);
}
static int nested_svm_exit_handled_msr(struct vcpu_svm *svm)
@ -709,7 +763,7 @@ static int nested_svm_exit_handled_msr(struct vcpu_svm *svm)
u32 offset, msr, value;
int write, mask;
if (!(svm->nested.ctl.intercept & (1ULL << INTERCEPT_MSR_PROT)))
if (!(vmcb_is_intercept(&svm->nested.ctl, INTERCEPT_MSR_PROT)))
return NESTED_EXIT_HOST;
msr = svm->vcpu.arch.regs[VCPU_REGS_RCX];
@ -736,7 +790,7 @@ static int nested_svm_intercept_ioio(struct vcpu_svm *svm)
u8 start_bit;
u64 gpa;
if (!(svm->nested.ctl.intercept & (1ULL << INTERCEPT_IOIO_PROT)))
if (!(vmcb_is_intercept(&svm->nested.ctl, INTERCEPT_IOIO_PROT)))
return NESTED_EXIT_HOST;
port = svm->vmcb->control.exit_info_1 >> 16;
@ -767,14 +821,12 @@ static int nested_svm_intercept(struct vcpu_svm *svm)
vmexit = nested_svm_intercept_ioio(svm);
break;
case SVM_EXIT_READ_CR0 ... SVM_EXIT_WRITE_CR8: {
u32 bit = 1U << (exit_code - SVM_EXIT_READ_CR0);
if (svm->nested.ctl.intercept_cr & bit)
if (vmcb_is_intercept(&svm->nested.ctl, exit_code))
vmexit = NESTED_EXIT_DONE;
break;
}
case SVM_EXIT_READ_DR0 ... SVM_EXIT_WRITE_DR7: {
u32 bit = 1U << (exit_code - SVM_EXIT_READ_DR0);
if (svm->nested.ctl.intercept_dr & bit)
if (vmcb_is_intercept(&svm->nested.ctl, exit_code))
vmexit = NESTED_EXIT_DONE;
break;
}
@ -792,8 +844,7 @@ static int nested_svm_intercept(struct vcpu_svm *svm)
break;
}
default: {
u64 exit_bits = 1ULL << (exit_code - SVM_EXIT_INTR);
if (svm->nested.ctl.intercept & exit_bits)
if (vmcb_is_intercept(&svm->nested.ctl, exit_code))
vmexit = NESTED_EXIT_DONE;
}
}
@ -833,7 +884,7 @@ static bool nested_exit_on_exception(struct vcpu_svm *svm)
{
unsigned int nr = svm->vcpu.arch.exception.nr;
return (svm->nested.ctl.intercept_exceptions & (1 << nr));
return (svm->nested.ctl.intercepts[INTERCEPT_EXCEPTION] & BIT(nr));
}
static void nested_svm_inject_exception_vmexit(struct vcpu_svm *svm)
@ -901,7 +952,7 @@ static void nested_svm_intr(struct vcpu_svm *svm)
static inline bool nested_exit_on_init(struct vcpu_svm *svm)
{
return (svm->nested.ctl.intercept & (1ULL << INTERCEPT_INIT));
return vmcb_is_intercept(&svm->nested.ctl, INTERCEPT_INIT);
}
static void nested_svm_init(struct vcpu_svm *svm)
@ -982,7 +1033,8 @@ int nested_svm_exit_special(struct vcpu_svm *svm)
case SVM_EXIT_EXCP_BASE ... SVM_EXIT_EXCP_BASE + 0x1f: {
u32 excp_bits = 1 << (exit_code - SVM_EXIT_EXCP_BASE);
if (get_host_vmcb(svm)->control.intercept_exceptions & excp_bits)
if (get_host_vmcb(svm)->control.intercepts[INTERCEPT_EXCEPTION] &
excp_bits)
return NESTED_EXIT_HOST;
else if (exit_code == SVM_EXIT_EXCP_BASE + PF_VECTOR &&
svm->vcpu.arch.apf.host_apf_flags)
@ -1020,7 +1072,7 @@ static int svm_get_nested_state(struct kvm_vcpu *vcpu,
/* First fill in the header and copy it out. */
if (is_guest_mode(vcpu)) {
kvm_state.hdr.svm.vmcb_pa = svm->nested.vmcb;
kvm_state.hdr.svm.vmcb_pa = svm->nested.vmcb12_gpa;
kvm_state.size += KVM_STATE_NESTED_SVM_VMCB_SIZE;
kvm_state.flags |= KVM_STATE_NESTED_GUEST_MODE;
@ -1094,7 +1146,8 @@ static int svm_set_nested_state(struct kvm_vcpu *vcpu,
if (!(kvm_state->flags & KVM_STATE_NESTED_GUEST_MODE)) {
svm_leave_nested(svm);
goto out_set_gif;
svm_set_gif(svm, !!(kvm_state->flags & KVM_STATE_NESTED_GIF_SET));
return 0;
}
if (!page_address_valid(vcpu, kvm_state->hdr.svm.vmcb_pa))
@ -1143,16 +1196,11 @@ static int svm_set_nested_state(struct kvm_vcpu *vcpu,
copy_vmcb_control_area(&hsave->control, &svm->vmcb->control);
hsave->save = *save;
svm->nested.vmcb = kvm_state->hdr.svm.vmcb_pa;
svm->nested.vmcb12_gpa = kvm_state->hdr.svm.vmcb_pa;
load_nested_vmcb_control(svm, ctl);
nested_prepare_vmcb_control(svm);
if (!nested_svm_vmrun_msrpm(svm))
return -EINVAL;
out_set_gif:
svm_set_gif(svm, !!(kvm_state->flags & KVM_STATE_NESTED_GIF_SET));
kvm_make_request(KVM_REQ_GET_NESTED_STATE_PAGES, vcpu);
ret = 0;
out_free:
kfree(save);
@ -1163,6 +1211,7 @@ static int svm_set_nested_state(struct kvm_vcpu *vcpu,
struct kvm_x86_nested_ops svm_nested_ops = {
.check_events = svm_check_nested_events,
.get_nested_state_pages = svm_get_nested_state_pages,
.get_state = svm_get_nested_state,
.set_state = svm_set_nested_state,
};

26
arch/x86/kvm/svm/sev.c
View File

@ -447,10 +447,8 @@ static int sev_launch_update_data(struct kvm *kvm, struct kvm_sev_cmd *argp)
}
/*
* The LAUNCH_UPDATE command will perform in-place encryption of the
* memory content (i.e it will write the same memory region with C=1).
* It's possible that the cache may contain the data with C=0, i.e.,
* unencrypted so invalidate it first.
* Flush (on non-coherent CPUs) before LAUNCH_UPDATE encrypts pages in
* place; the cache may contain the data that was written unencrypted.
*/
sev_clflush_pages(inpages, npages);
@ -806,10 +804,9 @@ static int sev_dbg_crypt(struct kvm *kvm, struct kvm_sev_cmd *argp, bool dec)
}
/*
* The DBG_{DE,EN}CRYPT commands will perform {dec,en}cryption of the
* memory content (i.e it will write the same memory region with C=1).
* It's possible that the cache may contain the data with C=0, i.e.,
* unencrypted so invalidate it first.
* Flush (on non-coherent CPUs) before DBG_{DE,EN}CRYPT read or modify
* the pages; flush the destination too so that future accesses do not
* see stale data.
*/
sev_clflush_pages(src_p, 1);
sev_clflush_pages(dst_p, 1);
@ -857,7 +854,7 @@ static int sev_launch_secret(struct kvm *kvm, struct kvm_sev_cmd *argp)
struct kvm_sev_launch_secret params;
struct page **pages;
void *blob, *hdr;
unsigned long n;
unsigned long n, i;
int ret, offset;
if (!sev_guest(kvm))
@ -870,6 +867,12 @@ static int sev_launch_secret(struct kvm *kvm, struct kvm_sev_cmd *argp)
if (IS_ERR(pages))
return PTR_ERR(pages);
/*
* Flush (on non-coherent CPUs) before LAUNCH_SECRET encrypts pages in
* place; the cache may contain the data that was written unencrypted.
*/
sev_clflush_pages(pages, n);
/*
* The secret must be copied into contiguous memory region, lets verify
* that userspace memory pages are contiguous before we issue command.
@ -915,6 +918,11 @@ static int sev_launch_secret(struct kvm *kvm, struct kvm_sev_cmd *argp)
e_free:
kfree(data);
e_unpin_memory:
/* content of memory is updated, mark pages dirty */
for (i = 0; i < n; i++) {
set_page_dirty_lock(pages[i]);
mark_page_accessed(pages[i]);
}
sev_unpin_memory(kvm, pages, n);
return ret;
}

406
arch/x86/kvm/svm/svm.c
View File

@ -91,7 +91,7 @@ static DEFINE_PER_CPU(u64, current_tsc_ratio);
static const struct svm_direct_access_msrs {
u32 index; /* Index of the MSR */
bool always; /* True if intercept is always on */
} direct_access_msrs[] = {
} direct_access_msrs[MAX_DIRECT_ACCESS_MSRS] = {
{ .index = MSR_STAR, .always = true },
{ .index = MSR_IA32_SYSENTER_CS, .always = true },
#ifdef CONFIG_X86_64
@ -263,9 +263,10 @@ static int get_max_npt_level(void)
#endif
}
void svm_set_efer(struct kvm_vcpu *vcpu, u64 efer)
int svm_set_efer(struct kvm_vcpu *vcpu, u64 efer)
{
struct vcpu_svm *svm = to_svm(vcpu);
u64 old_efer = vcpu->arch.efer;
vcpu->arch.efer = efer;
if (!npt_enabled) {
@ -276,13 +277,32 @@ void svm_set_efer(struct kvm_vcpu *vcpu, u64 efer)
efer &= ~EFER_LME;
}
if (!(efer & EFER_SVME)) {
svm_leave_nested(svm);
svm_set_gif(svm, true);
if ((old_efer & EFER_SVME) != (efer & EFER_SVME)) {
if (!(efer & EFER_SVME)) {
svm_leave_nested(svm);
svm_set_gif(svm, true);
/*
* Free the nested guest state, unless we are in SMM.
* In this case we will return to the nested guest
* as soon as we leave SMM.
*/
if (!is_smm(&svm->vcpu))
svm_free_nested(svm);
} else {
int ret = svm_allocate_nested(svm);
if (ret) {
vcpu->arch.efer = old_efer;
return ret;
}
}
}
svm->vmcb->save.efer = efer | EFER_SVME;
vmcb_mark_dirty(svm->vmcb, VMCB_CR);
return 0;
}
static int is_external_interrupt(u32 info)
@ -553,18 +573,44 @@ static int svm_cpu_init(int cpu)
}
static bool valid_msr_intercept(u32 index)
static int direct_access_msr_slot(u32 msr)
{
int i;
u32 i;
for (i = 0; direct_access_msrs[i].index != MSR_INVALID; i++)
if (direct_access_msrs[i].index == index)
return true;
if (direct_access_msrs[i].index == msr)
return i;
return false;
return -ENOENT;
}
static bool msr_write_intercepted(struct kvm_vcpu *vcpu, unsigned msr)
static void set_shadow_msr_intercept(struct kvm_vcpu *vcpu, u32 msr, int read,
int write)
{
struct vcpu_svm *svm = to_svm(vcpu);
int slot = direct_access_msr_slot(msr);
if (slot == -ENOENT)
return;
/* Set the shadow bitmaps to the desired intercept states */
if (read)
set_bit(slot, svm->shadow_msr_intercept.read);
else
clear_bit(slot, svm->shadow_msr_intercept.read);
if (write)
set_bit(slot, svm->shadow_msr_intercept.write);
else
clear_bit(slot, svm->shadow_msr_intercept.write);
}
static bool valid_msr_intercept(u32 index)
{
return direct_access_msr_slot(index) != -ENOENT;
}
static bool msr_write_intercepted(struct kvm_vcpu *vcpu, u32 msr)
{
u8 bit_write;
unsigned long tmp;
@ -583,8 +629,8 @@ static bool msr_write_intercepted(struct kvm_vcpu *vcpu, unsigned msr)
return !!test_bit(bit_write, &tmp);
}
static void set_msr_interception(u32 *msrpm, unsigned msr,
int read, int write)
static void set_msr_interception_bitmap(struct kvm_vcpu *vcpu, u32 *msrpm,
u32 msr, int read, int write)
{
u8 bit_read, bit_write;
unsigned long tmp;
@ -596,6 +642,13 @@ static void set_msr_interception(u32 *msrpm, unsigned msr,
*/
WARN_ON(!valid_msr_intercept(msr));
/* Enforce non allowed MSRs to trap */
if (read && !kvm_msr_allowed(vcpu, msr, KVM_MSR_FILTER_READ))
read = 0;
if (write && !kvm_msr_allowed(vcpu, msr, KVM_MSR_FILTER_WRITE))
write = 0;
offset = svm_msrpm_offset(msr);
bit_read = 2 * (msr & 0x0f);
bit_write = 2 * (msr & 0x0f) + 1;
@ -609,17 +662,60 @@ static void set_msr_interception(u32 *msrpm, unsigned msr,
msrpm[offset] = tmp;
}
static void svm_vcpu_init_msrpm(u32 *msrpm)
static void set_msr_interception(struct kvm_vcpu *vcpu, u32 *msrpm, u32 msr,
int read, int write)
{
set_shadow_msr_intercept(vcpu, msr, read, write);
set_msr_interception_bitmap(vcpu, msrpm, msr, read, write);
}
u32 *svm_vcpu_alloc_msrpm(void)
{
struct page *pages = alloc_pages(GFP_KERNEL_ACCOUNT, MSRPM_ALLOC_ORDER);
u32 *msrpm;
if (!pages)
return NULL;
msrpm = page_address(pages);
memset(msrpm, 0xff, PAGE_SIZE * (1 << MSRPM_ALLOC_ORDER));
return msrpm;
}
void svm_vcpu_init_msrpm(struct kvm_vcpu *vcpu, u32 *msrpm)
{
int i;
memset(msrpm, 0xff, PAGE_SIZE * (1 << MSRPM_ALLOC_ORDER));
for (i = 0; direct_access_msrs[i].index != MSR_INVALID; i++) {
if (!direct_access_msrs[i].always)
continue;
set_msr_interception(vcpu, msrpm, direct_access_msrs[i].index, 1, 1);
}
}
set_msr_interception(msrpm, direct_access_msrs[i].index, 1, 1);
void svm_vcpu_free_msrpm(u32 *msrpm)
{
__free_pages(virt_to_page(msrpm), MSRPM_ALLOC_ORDER);
}
static void svm_msr_filter_changed(struct kvm_vcpu *vcpu)
{
struct vcpu_svm *svm = to_svm(vcpu);
u32 i;
/*
* Set intercept permissions for all direct access MSRs again. They
* will automatically get filtered through the MSR filter, so we are
* back in sync after this.
*/
for (i = 0; direct_access_msrs[i].index != MSR_INVALID; i++) {
u32 msr = direct_access_msrs[i].index;
u32 read = test_bit(i, svm->shadow_msr_intercept.read);
u32 write = test_bit(i, svm->shadow_msr_intercept.write);
set_msr_interception_bitmap(vcpu, svm->msrpm, msr, read, write);
}
}
@ -666,26 +762,26 @@ static void init_msrpm_offsets(void)
}
}
static void svm_enable_lbrv(struct vcpu_svm *svm)
static void svm_enable_lbrv(struct kvm_vcpu *vcpu)
{
u32 *msrpm = svm->msrpm;
struct vcpu_svm *svm = to_svm(vcpu);
svm->vmcb->control.virt_ext |= LBR_CTL_ENABLE_MASK;
set_msr_interception(msrpm, MSR_IA32_LASTBRANCHFROMIP, 1, 1);
set_msr_interception(msrpm, MSR_IA32_LASTBRANCHTOIP, 1, 1);
set_msr_interception(msrpm, MSR_IA32_LASTINTFROMIP, 1, 1);
set_msr_interception(msrpm, MSR_IA32_LASTINTTOIP, 1, 1);
set_msr_interception(vcpu, svm->msrpm, MSR_IA32_LASTBRANCHFROMIP, 1, 1);
set_msr_interception(vcpu, svm->msrpm, MSR_IA32_LASTBRANCHTOIP, 1, 1);
set_msr_interception(vcpu, svm->msrpm, MSR_IA32_LASTINTFROMIP, 1, 1);
set_msr_interception(vcpu, svm->msrpm, MSR_IA32_LASTINTTOIP, 1, 1);
}
static void svm_disable_lbrv(struct vcpu_svm *svm)
static void svm_disable_lbrv(struct kvm_vcpu *vcpu)
{
u32 *msrpm = svm->msrpm;
struct vcpu_svm *svm = to_svm(vcpu);
svm->vmcb->control.virt_ext &= ~LBR_CTL_ENABLE_MASK;
set_msr_interception(msrpm, MSR_IA32_LASTBRANCHFROMIP, 0, 0);
set_msr_interception(msrpm, MSR_IA32_LASTBRANCHTOIP, 0, 0);
set_msr_interception(msrpm, MSR_IA32_LASTINTFROMIP, 0, 0);
set_msr_interception(msrpm, MSR_IA32_LASTINTTOIP, 0, 0);
set_msr_interception(vcpu, svm->msrpm, MSR_IA32_LASTBRANCHFROMIP, 0, 0);
set_msr_interception(vcpu, svm->msrpm, MSR_IA32_LASTBRANCHTOIP, 0, 0);
set_msr_interception(vcpu, svm->msrpm, MSR_IA32_LASTINTFROMIP, 0, 0);
set_msr_interception(vcpu, svm->msrpm, MSR_IA32_LASTINTTOIP, 0, 0);
}
void disable_nmi_singlestep(struct vcpu_svm *svm)
@ -813,6 +909,9 @@ static __init void svm_set_cpu_caps(void)
if (boot_cpu_has(X86_FEATURE_LS_CFG_SSBD) ||
boot_cpu_has(X86_FEATURE_AMD_SSBD))
kvm_cpu_cap_set(X86_FEATURE_VIRT_SSBD);
/* Enable INVPCID feature */
kvm_cpu_cap_check_and_set(X86_FEATURE_INVPCID);
}
static __init int svm_hardware_setup(void)
@ -985,6 +1084,21 @@ static u64 svm_write_l1_tsc_offset(struct kvm_vcpu *vcpu, u64 offset)
return svm->vmcb->control.tsc_offset;
}
static void svm_check_invpcid(struct vcpu_svm *svm)
{
/*
* Intercept INVPCID instruction only if shadow page table is
* enabled. Interception is not required with nested page table
* enabled.
*/
if (kvm_cpu_cap_has(X86_FEATURE_INVPCID)) {
if (!npt_enabled)
svm_set_intercept(svm, INTERCEPT_INVPCID);
else
svm_clr_intercept(svm, INTERCEPT_INVPCID);
}
}
static void init_vmcb(struct vcpu_svm *svm)
{
struct vmcb_control_area *control = &svm->vmcb->control;
@ -992,14 +1106,14 @@ static void init_vmcb(struct vcpu_svm *svm)
svm->vcpu.arch.hflags = 0;
set_cr_intercept(svm, INTERCEPT_CR0_READ);
set_cr_intercept(svm, INTERCEPT_CR3_READ);
set_cr_intercept(svm, INTERCEPT_CR4_READ);
set_cr_intercept(svm, INTERCEPT_CR0_WRITE);
set_cr_intercept(svm, INTERCEPT_CR3_WRITE);
set_cr_intercept(svm, INTERCEPT_CR4_WRITE);
svm_set_intercept(svm, INTERCEPT_CR0_READ);
svm_set_intercept(svm, INTERCEPT_CR3_READ);
svm_set_intercept(svm, INTERCEPT_CR4_READ);
svm_set_intercept(svm, INTERCEPT_CR0_WRITE);
svm_set_intercept(svm, INTERCEPT_CR3_WRITE);
svm_set_intercept(svm, INTERCEPT_CR4_WRITE);
if (!kvm_vcpu_apicv_active(&svm->vcpu))
set_cr_intercept(svm, INTERCEPT_CR8_WRITE);
svm_set_intercept(svm, INTERCEPT_CR8_WRITE);
set_dr_intercepts(svm);
@ -1094,15 +1208,15 @@ static void init_vmcb(struct vcpu_svm *svm)
control->nested_ctl |= SVM_NESTED_CTL_NP_ENABLE;
svm_clr_intercept(svm, INTERCEPT_INVLPG);
clr_exception_intercept(svm, PF_VECTOR);
clr_cr_intercept(svm, INTERCEPT_CR3_READ);
clr_cr_intercept(svm, INTERCEPT_CR3_WRITE);
svm_clr_intercept(svm, INTERCEPT_CR3_READ);
svm_clr_intercept(svm, INTERCEPT_CR3_WRITE);
save->g_pat = svm->vcpu.arch.pat;
save->cr3 = 0;
save->cr4 = 0;
}
svm->asid_generation = 0;
svm->nested.vmcb = 0;
svm->nested.vmcb12_gpa = 0;
svm->vcpu.arch.hflags = 0;
if (!kvm_pause_in_guest(svm->vcpu.kvm)) {
@ -1114,6 +1228,8 @@ static void init_vmcb(struct vcpu_svm *svm)
svm_clr_intercept(svm, INTERCEPT_PAUSE);
}
svm_check_invpcid(svm);
if (kvm_vcpu_apicv_active(&svm->vcpu))
avic_init_vmcb(svm);
@ -1171,35 +1287,20 @@ static void svm_vcpu_reset(struct kvm_vcpu *vcpu, bool init_event)
static int svm_create_vcpu(struct kvm_vcpu *vcpu)
{
struct vcpu_svm *svm;
struct page *page;
struct page *msrpm_pages;
struct page *hsave_page;
struct page *nested_msrpm_pages;
struct page *vmcb_page;
int err;
BUILD_BUG_ON(offsetof(struct vcpu_svm, vcpu) != 0);
svm = to_svm(vcpu);
err = -ENOMEM;
page = alloc_page(GFP_KERNEL_ACCOUNT);
if (!page)
vmcb_page = alloc_page(GFP_KERNEL_ACCOUNT | __GFP_ZERO);
if (!vmcb_page)
goto out;
msrpm_pages = alloc_pages(GFP_KERNEL_ACCOUNT, MSRPM_ALLOC_ORDER);
if (!msrpm_pages)
goto free_page1;
nested_msrpm_pages = alloc_pages(GFP_KERNEL_ACCOUNT, MSRPM_ALLOC_ORDER);
if (!nested_msrpm_pages)
goto free_page2;
hsave_page = alloc_page(GFP_KERNEL_ACCOUNT);
if (!hsave_page)
goto free_page3;
err = avic_init_vcpu(svm);
if (err)
goto free_page4;
goto error_free_vmcb_page;
/* We initialize this flag to true to make sure that the is_running
* bit would be set the first time the vcpu is loaded.
@ -1207,18 +1308,14 @@ static int svm_create_vcpu(struct kvm_vcpu *vcpu)
if (irqchip_in_kernel(vcpu->kvm) && kvm_apicv_activated(vcpu->kvm))
svm->avic_is_running = true;
svm->nested.hsave = page_address(hsave_page);
clear_page(svm->nested.hsave);
svm->msrpm = svm_vcpu_alloc_msrpm();
if (!svm->msrpm)
goto error_free_vmcb_page;
svm->msrpm = page_address(msrpm_pages);
svm_vcpu_init_msrpm(svm->msrpm);
svm_vcpu_init_msrpm(vcpu, svm->msrpm);
svm->nested.msrpm = page_address(nested_msrpm_pages);
svm_vcpu_init_msrpm(svm->nested.msrpm);
svm->vmcb = page_address(page);
clear_page(svm->vmcb);
svm->vmcb_pa = __sme_set(page_to_pfn(page) << PAGE_SHIFT);
svm->vmcb = page_address(vmcb_page);
svm->vmcb_pa = __sme_set(page_to_pfn(vmcb_page) << PAGE_SHIFT);
svm->asid_generation = 0;
init_vmcb(svm);
@ -1227,14 +1324,8 @@ static int svm_create_vcpu(struct kvm_vcpu *vcpu)
return 0;
free_page4:
__free_page(hsave_page);
free_page3:
__free_pages(nested_msrpm_pages, MSRPM_ALLOC_ORDER);
free_page2:
__free_pages(msrpm_pages, MSRPM_ALLOC_ORDER);
free_page1:
__free_page(page);
error_free_vmcb_page:
__free_page(vmcb_page);
out:
return err;
}
@ -1258,10 +1349,10 @@ static void svm_free_vcpu(struct kvm_vcpu *vcpu)
*/
svm_clear_current_vmcb(svm->vmcb);
svm_free_nested(svm);
__free_page(pfn_to_page(__sme_clr(svm->vmcb_pa) >> PAGE_SHIFT));
__free_pages(virt_to_page(svm->msrpm), MSRPM_ALLOC_ORDER);
__free_page(virt_to_page(svm->nested.hsave));
__free_pages(virt_to_page(svm->nested.msrpm), MSRPM_ALLOC_ORDER);
}
static void svm_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
@ -1549,11 +1640,11 @@ static void update_cr0_intercept(struct vcpu_svm *svm)
vmcb_mark_dirty(svm->vmcb, VMCB_CR);
if (gcr0 == *hcr0) {
clr_cr_intercept(svm, INTERCEPT_CR0_READ);
clr_cr_intercept(svm, INTERCEPT_CR0_WRITE);
svm_clr_intercept(svm, INTERCEPT_CR0_READ);
svm_clr_intercept(svm, INTERCEPT_CR0_WRITE);
} else {
set_cr_intercept(svm, INTERCEPT_CR0_READ);
set_cr_intercept(svm, INTERCEPT_CR0_WRITE);
svm_set_intercept(svm, INTERCEPT_CR0_READ);
svm_set_intercept(svm, INTERCEPT_CR0_WRITE);
}
}
@ -2224,12 +2315,9 @@ static bool check_selective_cr0_intercepted(struct vcpu_svm *svm,
{
unsigned long cr0 = svm->vcpu.arch.cr0;
bool ret = false;
u64 intercept;
intercept = svm->nested.ctl.intercept;
if (!is_guest_mode(&svm->vcpu) ||
(!(intercept & (1ULL << INTERCEPT_SELECTIVE_CR0))))
(!(vmcb_is_intercept(&svm->nested.ctl, INTERCEPT_SELECTIVE_CR0))))
return false;
cr0 &= ~SVM_CR0_SELECTIVE_MASK;
@ -2267,6 +2355,7 @@ static int cr_interception(struct vcpu_svm *svm)
if (cr >= 16) { /* mov to cr */
cr -= 16;
val = kvm_register_read(&svm->vcpu, reg);
trace_kvm_cr_write(cr, val);
switch (cr) {
case 0:
if (!check_selective_cr0_intercepted(svm, val))
@ -2312,6 +2401,7 @@ static int cr_interception(struct vcpu_svm *svm)
return 1;
}
kvm_register_write(&svm->vcpu, reg, val);
trace_kvm_cr_read(cr, val);
}
return kvm_complete_insn_gp(&svm->vcpu, err);
}
@ -2562,7 +2652,7 @@ static int svm_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr)
* We update the L1 MSR bit as well since it will end up
* touching the MSR anyway now.
*/
set_msr_interception(svm->msrpm, MSR_IA32_SPEC_CTRL, 1, 1);
set_msr_interception(vcpu, svm->msrpm, MSR_IA32_SPEC_CTRL, 1, 1);
break;
case MSR_IA32_PRED_CMD:
if (!msr->host_initiated &&
@ -2577,7 +2667,7 @@ static int svm_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr)
break;
wrmsrl(MSR_IA32_PRED_CMD, PRED_CMD_IBPB);
set_msr_interception(svm->msrpm, MSR_IA32_PRED_CMD, 0, 1);
set_msr_interception(vcpu, svm->msrpm, MSR_IA32_PRED_CMD, 0, 1);
break;
case MSR_AMD64_VIRT_SPEC_CTRL:
if (!msr->host_initiated &&
@ -2641,9 +2731,9 @@ static int svm_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr)
svm->vmcb->save.dbgctl = data;
vmcb_mark_dirty(svm->vmcb, VMCB_LBR);
if (data & (1ULL<<0))
svm_enable_lbrv(svm);
svm_enable_lbrv(vcpu);
else
svm_disable_lbrv(svm);
svm_disable_lbrv(vcpu);
break;
case MSR_VM_HSAVE_PA:
svm->nested.hsave_msr = data;
@ -2739,6 +2829,33 @@ static int mwait_interception(struct vcpu_svm *svm)
return nop_interception(svm);
}
static int invpcid_interception(struct vcpu_svm *svm)
{
struct kvm_vcpu *vcpu = &svm->vcpu;
unsigned long type;
gva_t gva;
if (!guest_cpuid_has(vcpu, X86_FEATURE_INVPCID)) {
kvm_queue_exception(vcpu, UD_VECTOR);
return 1;
}
/*
* For an INVPCID intercept:
* EXITINFO1 provides the linear address of the memory operand.
* EXITINFO2 provides the contents of the register operand.
*/
type = svm->vmcb->control.exit_info_2;
gva = svm->vmcb->control.exit_info_1;
if (type > 3) {
kvm_inject_gp(vcpu, 0);
return 1;
}
return kvm_handle_invpcid(vcpu, type, gva);
}
static int (*const svm_exit_handlers[])(struct vcpu_svm *svm) = {
[SVM_EXIT_READ_CR0] = cr_interception,
[SVM_EXIT_READ_CR3] = cr_interception,
@ -2801,6 +2918,7 @@ static int (*const svm_exit_handlers[])(struct vcpu_svm *svm) = {
[SVM_EXIT_MWAIT] = mwait_interception,
[SVM_EXIT_XSETBV] = xsetbv_interception,
[SVM_EXIT_RDPRU] = rdpru_interception,
[SVM_EXIT_INVPCID] = invpcid_interception,
[SVM_EXIT_NPF] = npf_interception,
[SVM_EXIT_RSM] = rsm_interception,
[SVM_EXIT_AVIC_INCOMPLETE_IPI] = avic_incomplete_ipi_interception,
@ -2819,12 +2937,14 @@ static void dump_vmcb(struct kvm_vcpu *vcpu)
}
pr_err("VMCB Control Area:\n");
pr_err("%-20s%04x\n", "cr_read:", control->intercept_cr & 0xffff);
pr_err("%-20s%04x\n", "cr_write:", control->intercept_cr >> 16);
pr_err("%-20s%04x\n", "dr_read:", control->intercept_dr & 0xffff);
pr_err("%-20s%04x\n", "dr_write:", control->intercept_dr >> 16);
pr_err("%-20s%08x\n", "exceptions:", control->intercept_exceptions);
pr_err("%-20s%016llx\n", "intercepts:", control->intercept);
pr_err("%-20s%04x\n", "cr_read:", control->intercepts[INTERCEPT_CR] & 0xffff);
pr_err("%-20s%04x\n", "cr_write:", control->intercepts[INTERCEPT_CR] >> 16);
pr_err("%-20s%04x\n", "dr_read:", control->intercepts[INTERCEPT_DR] & 0xffff);
pr_err("%-20s%04x\n", "dr_write:", control->intercepts[INTERCEPT_DR] >> 16);
pr_err("%-20s%08x\n", "exceptions:", control->intercepts[INTERCEPT_EXCEPTION]);
pr_err("%-20s%08x %08x\n", "intercepts:",
control->intercepts[INTERCEPT_WORD3],
control->intercepts[INTERCEPT_WORD4]);
pr_err("%-20s%d\n", "pause filter count:", control->pause_filter_count);
pr_err("%-20s%d\n", "pause filter threshold:",
control->pause_filter_thresh);
@ -2923,12 +3043,19 @@ static void dump_vmcb(struct kvm_vcpu *vcpu)
"excp_to:", save->last_excp_to);
}
static void svm_get_exit_info(struct kvm_vcpu *vcpu, u64 *info1, u64 *info2)
static void svm_get_exit_info(struct kvm_vcpu *vcpu, u64 *info1, u64 *info2,
u32 *intr_info, u32 *error_code)
{
struct vmcb_control_area *control = &to_svm(vcpu)->vmcb->control;
*info1 = control->exit_info_1;
*info2 = control->exit_info_2;
*intr_info = control->exit_int_info;
if ((*intr_info & SVM_EXITINTINFO_VALID) &&
(*intr_info & SVM_EXITINTINFO_VALID_ERR))
*error_code = control->exit_int_info_err;
else
*error_code = 0;
}
static int handle_exit(struct kvm_vcpu *vcpu, fastpath_t exit_fastpath)
@ -2939,7 +3066,7 @@ static int handle_exit(struct kvm_vcpu *vcpu, fastpath_t exit_fastpath)
trace_kvm_exit(exit_code, vcpu, KVM_ISA_SVM);
if (!is_cr_intercept(svm, INTERCEPT_CR0_WRITE))
if (!svm_is_intercept(svm, INTERCEPT_CR0_WRITE))
vcpu->arch.cr0 = svm->vmcb->save.cr0;
if (npt_enabled)
vcpu->arch.cr3 = svm->vmcb->save.cr3;
@ -2947,12 +3074,7 @@ static int handle_exit(struct kvm_vcpu *vcpu, fastpath_t exit_fastpath)
if (is_guest_mode(vcpu)) {
int vmexit;
trace_kvm_nested_vmexit(svm->vmcb->save.rip, exit_code,
svm->vmcb->control.exit_info_1,
svm->vmcb->control.exit_info_2,
svm->vmcb->control.exit_int_info,
svm->vmcb->control.exit_int_info_err,
KVM_ISA_SVM);
trace_kvm_nested_vmexit(exit_code, vcpu, KVM_ISA_SVM);
vmexit = nested_svm_exit_special(svm);
@ -3062,13 +3184,13 @@ static void update_cr8_intercept(struct kvm_vcpu *vcpu, int tpr, int irr)
if (nested_svm_virtualize_tpr(vcpu))
return;
clr_cr_intercept(svm, INTERCEPT_CR8_WRITE);
svm_clr_intercept(svm, INTERCEPT_CR8_WRITE);
if (irr == -1)
return;
if (tpr >= irr)
set_cr_intercept(svm, INTERCEPT_CR8_WRITE);
svm_set_intercept(svm, INTERCEPT_CR8_WRITE);
}
bool svm_nmi_blocked(struct kvm_vcpu *vcpu)
@ -3256,7 +3378,7 @@ static inline void sync_cr8_to_lapic(struct kvm_vcpu *vcpu)
if (nested_svm_virtualize_tpr(vcpu))
return;
if (!is_cr_intercept(svm, INTERCEPT_CR8_WRITE)) {
if (!svm_is_intercept(svm, INTERCEPT_CR8_WRITE)) {
int cr8 = svm->vmcb->control.int_ctl & V_TPR_MASK;
kvm_set_cr8(vcpu, cr8);
}
@ -3353,8 +3475,7 @@ static void svm_cancel_injection(struct kvm_vcpu *vcpu)
static fastpath_t svm_exit_handlers_fastpath(struct kvm_vcpu *vcpu)
{
if (!is_guest_mode(vcpu) &&
to_svm(vcpu)->vmcb->control.exit_code == SVM_EXIT_MSR &&
if (to_svm(vcpu)->vmcb->control.exit_code == SVM_EXIT_MSR &&
to_svm(vcpu)->vmcb->control.exit_info_1)
return handle_fastpath_set_msr_irqoff(vcpu);
@ -3419,7 +3540,6 @@ static noinstr void svm_vcpu_enter_exit(struct kvm_vcpu *vcpu,
static __no_kcsan fastpath_t svm_vcpu_run(struct kvm_vcpu *vcpu)
{
fastpath_t exit_fastpath;
struct vcpu_svm *svm = to_svm(vcpu);
svm->vmcb->save.rax = vcpu->arch.regs[VCPU_REGS_RAX];
@ -3460,9 +3580,7 @@ static __no_kcsan fastpath_t svm_vcpu_run(struct kvm_vcpu *vcpu)
clgi();
kvm_load_guest_xsave_state(vcpu);
if (lapic_in_kernel(vcpu) &&
vcpu->arch.apic->lapic_timer.timer_advance_ns)
kvm_wait_lapic_expire(vcpu);
kvm_wait_lapic_expire(vcpu);
/*
* If this vCPU has touched SPEC_CTRL, restore the guest's value if
@ -3542,8 +3660,11 @@ static __no_kcsan fastpath_t svm_vcpu_run(struct kvm_vcpu *vcpu)
svm_handle_mce(svm);
svm_complete_interrupts(svm);
exit_fastpath = svm_exit_handlers_fastpath(vcpu);
return exit_fastpath;
if (is_guest_mode(vcpu))
return EXIT_FASTPATH_NONE;
return svm_exit_handlers_fastpath(vcpu);
}
static void svm_load_mmu_pgd(struct kvm_vcpu *vcpu, unsigned long root,
@ -3629,6 +3750,9 @@ static void svm_vcpu_after_set_cpuid(struct kvm_vcpu *vcpu)
svm->nrips_enabled = kvm_cpu_cap_has(X86_FEATURE_NRIPS) &&
guest_cpuid_has(&svm->vcpu, X86_FEATURE_NRIPS);
/* Check again if INVPCID interception if required */
svm_check_invpcid(svm);
if (!kvm_vcpu_apicv_active(vcpu))
return;
@ -3743,7 +3867,6 @@ static int svm_check_intercept(struct kvm_vcpu *vcpu,
break;
case SVM_EXIT_WRITE_CR0: {
unsigned long cr0, val;
u64 intercept;
if (info->intercept == x86_intercept_cr_write)
icpt_info.exit_code += info->modrm_reg;
@ -3752,9 +3875,8 @@ static int svm_check_intercept(struct kvm_vcpu *vcpu,
info->intercept == x86_intercept_clts)
break;
intercept = svm->nested.ctl.intercept;
if (!(intercept & (1ULL << INTERCEPT_SELECTIVE_CR0)))
if (!(vmcb_is_intercept(&svm->nested.ctl,
INTERCEPT_SELECTIVE_CR0)))
break;
cr0 = vcpu->arch.cr0 & ~SVM_CR0_SELECTIVE_MASK;
@ -3889,7 +4011,7 @@ static int svm_pre_enter_smm(struct kvm_vcpu *vcpu, char *smstate)
/* FED8h - SVM Guest */
put_smstate(u64, smstate, 0x7ed8, 1);
/* FEE0h - SVM Guest VMCB Physical Address */
put_smstate(u64, smstate, 0x7ee0, svm->nested.vmcb);
put_smstate(u64, smstate, 0x7ee0, svm->nested.vmcb12_gpa);
svm->vmcb->save.rax = vcpu->arch.regs[VCPU_REGS_RAX];
svm->vmcb->save.rsp = vcpu->arch.regs[VCPU_REGS_RSP];
@ -3911,7 +4033,7 @@ static int svm_pre_leave_smm(struct kvm_vcpu *vcpu, const char *smstate)
if (guest_cpuid_has(vcpu, X86_FEATURE_LM)) {
u64 saved_efer = GET_SMSTATE(u64, smstate, 0x7ed0);
u64 guest = GET_SMSTATE(u64, smstate, 0x7ed8);
u64 vmcb = GET_SMSTATE(u64, smstate, 0x7ee0);
u64 vmcb12_gpa = GET_SMSTATE(u64, smstate, 0x7ee0);
if (guest) {
if (!guest_cpuid_has(vcpu, X86_FEATURE_SVM))
@ -3921,10 +4043,13 @@ static int svm_pre_leave_smm(struct kvm_vcpu *vcpu, const char *smstate)
return 1;
if (kvm_vcpu_map(&svm->vcpu,
gpa_to_gfn(vmcb), &map) == -EINVAL)
gpa_to_gfn(vmcb12_gpa), &map) == -EINVAL)
return 1;
ret = enter_svm_guest_mode(svm, vmcb, map.hva);
if (svm_allocate_nested(svm))
return 1;
ret = enter_svm_guest_mode(svm, vmcb12_gpa, map.hva);
kvm_vcpu_unmap(&svm->vcpu, &map, true);
}
}
@ -3945,19 +4070,10 @@ static void enable_smi_window(struct kvm_vcpu *vcpu)
}
}
static bool svm_need_emulation_on_page_fault(struct kvm_vcpu *vcpu)
static bool svm_can_emulate_instruction(struct kvm_vcpu *vcpu, void *insn, int insn_len)
{
unsigned long cr4 = kvm_read_cr4(vcpu);
bool smep = cr4 & X86_CR4_SMEP;
bool smap = cr4 & X86_CR4_SMAP;
bool is_user = svm_get_cpl(vcpu) == 3;
/*
* If RIP is invalid, go ahead with emulation which will cause an
* internal error exit.
*/
if (!kvm_vcpu_gfn_to_memslot(vcpu, kvm_rip_read(vcpu) >> PAGE_SHIFT))
return true;
bool smep, smap, is_user;
unsigned long cr4;
/*
* Detect and workaround Errata 1096 Fam_17h_00_0Fh.
@ -3999,6 +4115,20 @@ static bool svm_need_emulation_on_page_fault(struct kvm_vcpu *vcpu)
* instruction pointer so we will not able to workaround it. Lets
* print the error and request to kill the guest.
*/
if (likely(!insn || insn_len))
return true;
/*
* If RIP is invalid, go ahead with emulation which will cause an
* internal error exit.
*/
if (!kvm_vcpu_gfn_to_memslot(vcpu, kvm_rip_read(vcpu) >> PAGE_SHIFT))
return true;
cr4 = kvm_read_cr4(vcpu);
smep = cr4 & X86_CR4_SMEP;
smap = cr4 & X86_CR4_SMAP;
is_user = svm_get_cpl(vcpu) == 3;
if (smap && (!smep || is_user)) {
if (!sev_guest(vcpu->kvm))
return true;
@ -4022,7 +4152,7 @@ static bool svm_apic_init_signal_blocked(struct kvm_vcpu *vcpu)
* if an INIT signal is pending.
*/
return !gif_set(svm) ||
(svm->vmcb->control.intercept & (1ULL << INTERCEPT_INIT));
(vmcb_is_intercept(&svm->vmcb->control, INTERCEPT_INIT));
}
static void svm_vm_destroy(struct kvm *kvm)
@ -4160,9 +4290,11 @@ static struct kvm_x86_ops svm_x86_ops __initdata = {
.mem_enc_reg_region = svm_register_enc_region,
.mem_enc_unreg_region = svm_unregister_enc_region,
.need_emulation_on_page_fault = svm_need_emulation_on_page_fault,
.can_emulate_instruction = svm_can_emulate_instruction,
.apic_init_signal_blocked = svm_apic_init_signal_blocked,
.msr_filter_changed = svm_msr_filter_changed,
};
static struct kvm_x86_init_ops svm_init_ops __initdata = {

103
arch/x86/kvm/svm/svm.h
View File

@ -31,6 +31,7 @@ static const u32 host_save_user_msrs[] = {
#define NR_HOST_SAVE_USER_MSRS ARRAY_SIZE(host_save_user_msrs)
#define MAX_DIRECT_ACCESS_MSRS 15
#define MSRPM_OFFSETS 16
extern u32 msrpm_offsets[MSRPM_OFFSETS] __read_mostly;
extern bool npt_enabled;
@ -85,8 +86,7 @@ struct svm_nested_state {
struct vmcb *hsave;
u64 hsave_msr;
u64 vm_cr_msr;
u64 vmcb;
u32 host_intercept_exceptions;
u64 vmcb12_gpa;
/* These are the merged vectors */
u32 *msrpm;
@ -97,6 +97,8 @@ struct svm_nested_state {
/* cache for control fields of the guest */
struct vmcb_control_area ctl;
bool initialized;
};
struct vcpu_svm {
@ -158,6 +160,12 @@ struct vcpu_svm {
*/
struct list_head ir_list;
spinlock_t ir_list_lock;
/* Save desired MSR intercept (read: pass-through) state */
struct {
DECLARE_BITMAP(read, MAX_DIRECT_ACCESS_MSRS);
DECLARE_BITMAP(write, MAX_DIRECT_ACCESS_MSRS);
} shadow_msr_intercept;
};
struct svm_cpu_data {
@ -214,51 +222,44 @@ static inline struct vmcb *get_host_vmcb(struct vcpu_svm *svm)
return svm->vmcb;
}
static inline void set_cr_intercept(struct vcpu_svm *svm, int bit)
static inline void vmcb_set_intercept(struct vmcb_control_area *control, u32 bit)
{
struct vmcb *vmcb = get_host_vmcb(svm);
vmcb->control.intercept_cr |= (1U << bit);
recalc_intercepts(svm);
WARN_ON_ONCE(bit >= 32 * MAX_INTERCEPT);
__set_bit(bit, (unsigned long *)&control->intercepts);
}
static inline void clr_cr_intercept(struct vcpu_svm *svm, int bit)
static inline void vmcb_clr_intercept(struct vmcb_control_area *control, u32 bit)
{
struct vmcb *vmcb = get_host_vmcb(svm);
vmcb->control.intercept_cr &= ~(1U << bit);
recalc_intercepts(svm);
WARN_ON_ONCE(bit >= 32 * MAX_INTERCEPT);
__clear_bit(bit, (unsigned long *)&control->intercepts);
}
static inline bool is_cr_intercept(struct vcpu_svm *svm, int bit)
static inline bool vmcb_is_intercept(struct vmcb_control_area *control, u32 bit)
{
struct vmcb *vmcb = get_host_vmcb(svm);
return vmcb->control.intercept_cr & (1U << bit);
WARN_ON_ONCE(bit >= 32 * MAX_INTERCEPT);
return test_bit(bit, (unsigned long *)&control->intercepts);
}
static inline void set_dr_intercepts(struct vcpu_svm *svm)
{
struct vmcb *vmcb = get_host_vmcb(svm);
vmcb->control.intercept_dr = (1 << INTERCEPT_DR0_READ)
| (1 << INTERCEPT_DR1_READ)
| (1 << INTERCEPT_DR2_READ)
| (1 << INTERCEPT_DR3_READ)
| (1 << INTERCEPT_DR4_READ)
| (1 << INTERCEPT_DR5_READ)
| (1 << INTERCEPT_DR6_READ)
| (1 << INTERCEPT_DR7_READ)
| (1 << INTERCEPT_DR0_WRITE)
| (1 << INTERCEPT_DR1_WRITE)
| (1 << INTERCEPT_DR2_WRITE)
| (1 << INTERCEPT_DR3_WRITE)
| (1 << INTERCEPT_DR4_WRITE)
| (1 << INTERCEPT_DR5_WRITE)
| (1 << INTERCEPT_DR6_WRITE)
| (1 << INTERCEPT_DR7_WRITE);
vmcb_set_intercept(&vmcb->control, INTERCEPT_DR0_READ);
vmcb_set_intercept(&vmcb->control, INTERCEPT_DR1_READ);
vmcb_set_intercept(&vmcb->control, INTERCEPT_DR2_READ);
vmcb_set_intercept(&vmcb->control, INTERCEPT_DR3_READ);
vmcb_set_intercept(&vmcb->control, INTERCEPT_DR4_READ);
vmcb_set_intercept(&vmcb->control, INTERCEPT_DR5_READ);
vmcb_set_intercept(&vmcb->control, INTERCEPT_DR6_READ);
vmcb_set_intercept(&vmcb->control, INTERCEPT_DR7_READ);
vmcb_set_intercept(&vmcb->control, INTERCEPT_DR0_WRITE);
vmcb_set_intercept(&vmcb->control, INTERCEPT_DR1_WRITE);
vmcb_set_intercept(&vmcb->control, INTERCEPT_DR2_WRITE);
vmcb_set_intercept(&vmcb->control, INTERCEPT_DR3_WRITE);
vmcb_set_intercept(&vmcb->control, INTERCEPT_DR4_WRITE);
vmcb_set_intercept(&vmcb->control, INTERCEPT_DR5_WRITE);
vmcb_set_intercept(&vmcb->control, INTERCEPT_DR6_WRITE);
vmcb_set_intercept(&vmcb->control, INTERCEPT_DR7_WRITE);
recalc_intercepts(svm);
}
@ -267,25 +268,27 @@ static inline void clr_dr_intercepts(struct vcpu_svm *svm)
{
struct vmcb *vmcb = get_host_vmcb(svm);
vmcb->control.intercept_dr = 0;
vmcb->control.intercepts[INTERCEPT_DR] = 0;
recalc_intercepts(svm);
}
static inline void set_exception_intercept(struct vcpu_svm *svm, int bit)
static inline void set_exception_intercept(struct vcpu_svm *svm, u32 bit)
{
struct vmcb *vmcb = get_host_vmcb(svm);
vmcb->control.intercept_exceptions |= (1U << bit);
WARN_ON_ONCE(bit >= 32);
vmcb_set_intercept(&vmcb->control, INTERCEPT_EXCEPTION_OFFSET + bit);
recalc_intercepts(svm);
}
static inline void clr_exception_intercept(struct vcpu_svm *svm, int bit)
static inline void clr_exception_intercept(struct vcpu_svm *svm, u32 bit)
{
struct vmcb *vmcb = get_host_vmcb(svm);
vmcb->control.intercept_exceptions &= ~(1U << bit);
WARN_ON_ONCE(bit >= 32);
vmcb_clr_intercept(&vmcb->control, INTERCEPT_EXCEPTION_OFFSET + bit);
recalc_intercepts(svm);
}
@ -294,7 +297,7 @@ static inline void svm_set_intercept(struct vcpu_svm *svm, int bit)
{
struct vmcb *vmcb = get_host_vmcb(svm);
vmcb->control.intercept |= (1ULL << bit);
vmcb_set_intercept(&vmcb->control, bit);
recalc_intercepts(svm);
}
@ -303,14 +306,14 @@ static inline void svm_clr_intercept(struct vcpu_svm *svm, int bit)
{
struct vmcb *vmcb = get_host_vmcb(svm);
vmcb->control.intercept &= ~(1ULL << bit);
vmcb_clr_intercept(&vmcb->control, bit);
recalc_intercepts(svm);
}
static inline bool svm_is_intercept(struct vcpu_svm *svm, int bit)
{
return (svm->vmcb->control.intercept & (1ULL << bit)) != 0;
return vmcb_is_intercept(&svm->vmcb->control, bit);
}
static inline bool vgif_enabled(struct vcpu_svm *svm)
@ -345,11 +348,15 @@ static inline bool gif_set(struct vcpu_svm *svm)
/* svm.c */
#define MSR_CR3_LEGACY_RESERVED_MASK 0xfe7U
#define MSR_CR3_LEGACY_PAE_RESERVED_MASK 0x7U
#define MSR_CR3_LONG_RESERVED_MASK 0xfff0000000000fe7U
#define MSR_CR3_LONG_MBZ_MASK 0xfff0000000000000U
#define MSR_INVALID 0xffffffffU
u32 svm_msrpm_offset(u32 msr);
void svm_set_efer(struct kvm_vcpu *vcpu, u64 efer);
u32 *svm_vcpu_alloc_msrpm(void);
void svm_vcpu_init_msrpm(struct kvm_vcpu *vcpu, u32 *msrpm);
void svm_vcpu_free_msrpm(u32 *msrpm);
int svm_set_efer(struct kvm_vcpu *vcpu, u64 efer);
void svm_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0);
int svm_set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4);
void svm_flush_tlb(struct kvm_vcpu *vcpu);
@ -374,22 +381,24 @@ static inline bool nested_svm_virtualize_tpr(struct kvm_vcpu *vcpu)
static inline bool nested_exit_on_smi(struct vcpu_svm *svm)
{
return (svm->nested.ctl.intercept & (1ULL << INTERCEPT_SMI));
return vmcb_is_intercept(&svm->nested.ctl, INTERCEPT_SMI);
}
static inline bool nested_exit_on_intr(struct vcpu_svm *svm)
{
return (svm->nested.ctl.intercept & (1ULL << INTERCEPT_INTR));
return vmcb_is_intercept(&svm->nested.ctl, INTERCEPT_INTR);
}
static inline bool nested_exit_on_nmi(struct vcpu_svm *svm)
{
return (svm->nested.ctl.intercept & (1ULL << INTERCEPT_NMI));
return vmcb_is_intercept(&svm->nested.ctl, INTERCEPT_NMI);
}
int enter_svm_guest_mode(struct vcpu_svm *svm, u64 vmcb_gpa,
struct vmcb *nested_vmcb);
void svm_leave_nested(struct vcpu_svm *svm);
void svm_free_nested(struct vcpu_svm *svm);
int svm_allocate_nested(struct vcpu_svm *svm);
int nested_svm_vmrun(struct vcpu_svm *svm);
void nested_svm_vmloadsave(struct vmcb *from_vmcb, struct vmcb *to_vmcb);
int nested_svm_vmexit(struct vcpu_svm *svm);

128
arch/x86/kvm/trace.h
View File

@ -15,18 +15,20 @@
* Tracepoint for guest mode entry.
*/
TRACE_EVENT(kvm_entry,
TP_PROTO(unsigned int vcpu_id),
TP_ARGS(vcpu_id),
TP_PROTO(struct kvm_vcpu *vcpu),
TP_ARGS(vcpu),
TP_STRUCT__entry(
__field( unsigned int, vcpu_id )
__field( unsigned long, rip )
),
TP_fast_assign(
__entry->vcpu_id = vcpu_id;
__entry->vcpu_id = vcpu->vcpu_id;
__entry->rip = kvm_rip_read(vcpu);
),
TP_printk("vcpu %u", __entry->vcpu_id)
TP_printk("vcpu %u, rip 0x%lx", __entry->vcpu_id, __entry->rip)
);
/*
@ -233,36 +235,45 @@ TRACE_EVENT(kvm_apic,
(isa == KVM_ISA_VMX) ? \
__print_flags(exit_reason & ~0xffff, " ", VMX_EXIT_REASON_FLAGS) : ""
#define TRACE_EVENT_KVM_EXIT(name) \
TRACE_EVENT(name, \
TP_PROTO(unsigned int exit_reason, struct kvm_vcpu *vcpu, u32 isa), \
TP_ARGS(exit_reason, vcpu, isa), \
\
TP_STRUCT__entry( \
__field( unsigned int, exit_reason ) \
__field( unsigned long, guest_rip ) \
__field( u32, isa ) \
__field( u64, info1 ) \
__field( u64, info2 ) \
__field( u32, intr_info ) \
__field( u32, error_code ) \
__field( unsigned int, vcpu_id ) \
), \
\
TP_fast_assign( \
__entry->exit_reason = exit_reason; \
__entry->guest_rip = kvm_rip_read(vcpu); \
__entry->isa = isa; \
__entry->vcpu_id = vcpu->vcpu_id; \
kvm_x86_ops.get_exit_info(vcpu, &__entry->info1, \
&__entry->info2, \
&__entry->intr_info, \
&__entry->error_code); \
), \
\
TP_printk("vcpu %u reason %s%s%s rip 0x%lx info1 0x%016llx " \
"info2 0x%016llx intr_info 0x%08x error_code 0x%08x", \
__entry->vcpu_id, \
kvm_print_exit_reason(__entry->exit_reason, __entry->isa), \
__entry->guest_rip, __entry->info1, __entry->info2, \
__entry->intr_info, __entry->error_code) \
)
/*
* Tracepoint for kvm guest exit:
*/
TRACE_EVENT(kvm_exit,
TP_PROTO(unsigned int exit_reason, struct kvm_vcpu *vcpu, u32 isa),
TP_ARGS(exit_reason, vcpu, isa),
TP_STRUCT__entry(
__field( unsigned int, exit_reason )
__field( unsigned long, guest_rip )
__field( u32, isa )
__field( u64, info1 )
__field( u64, info2 )
__field( unsigned int, vcpu_id )
),
TP_fast_assign(
__entry->exit_reason = exit_reason;
__entry->guest_rip = kvm_rip_read(vcpu);
__entry->isa = isa;
__entry->vcpu_id = vcpu->vcpu_id;
kvm_x86_ops.get_exit_info(vcpu, &__entry->info1,
&__entry->info2);
),
TP_printk("vcpu %u reason %s%s%s rip 0x%lx info %llx %llx",
__entry->vcpu_id,
kvm_print_exit_reason(__entry->exit_reason, __entry->isa),
__entry->guest_rip, __entry->info1, __entry->info2)
);
TRACE_EVENT_KVM_EXIT(kvm_exit);
/*
* Tracepoint for kvm interrupt injection:
@ -544,63 +555,38 @@ TRACE_EVENT(kvm_nested_vmrun,
);
TRACE_EVENT(kvm_nested_intercepts,
TP_PROTO(__u16 cr_read, __u16 cr_write, __u32 exceptions, __u64 intercept),
TP_ARGS(cr_read, cr_write, exceptions, intercept),
TP_PROTO(__u16 cr_read, __u16 cr_write, __u32 exceptions,
__u32 intercept1, __u32 intercept2, __u32 intercept3),
TP_ARGS(cr_read, cr_write, exceptions, intercept1,
intercept2, intercept3),
TP_STRUCT__entry(
__field( __u16, cr_read )
__field( __u16, cr_write )
__field( __u32, exceptions )
__field( __u64, intercept )
__field( __u32, intercept1 )
__field( __u32, intercept2 )
__field( __u32, intercept3 )
),
TP_fast_assign(
__entry->cr_read = cr_read;
__entry->cr_write = cr_write;
__entry->exceptions = exceptions;
__entry->intercept = intercept;
__entry->intercept1 = intercept1;
__entry->intercept2 = intercept2;
__entry->intercept3 = intercept3;
),
TP_printk("cr_read: %04x cr_write: %04x excp: %08x intercept: %016llx",
__entry->cr_read, __entry->cr_write, __entry->exceptions,
__entry->intercept)
TP_printk("cr_read: %04x cr_write: %04x excp: %08x "
"intercepts: %08x %08x %08x",
__entry->cr_read, __entry->cr_write, __entry->exceptions,
__entry->intercept1, __entry->intercept2, __entry->intercept3)
);
/*
* Tracepoint for #VMEXIT while nested
*/
TRACE_EVENT(kvm_nested_vmexit,
TP_PROTO(__u64 rip, __u32 exit_code,
__u64 exit_info1, __u64 exit_info2,
__u32 exit_int_info, __u32 exit_int_info_err, __u32 isa),
TP_ARGS(rip, exit_code, exit_info1, exit_info2,
exit_int_info, exit_int_info_err, isa),
TP_STRUCT__entry(
__field( __u64, rip )
__field( __u32, exit_code )
__field( __u64, exit_info1 )
__field( __u64, exit_info2 )
__field( __u32, exit_int_info )
__field( __u32, exit_int_info_err )
__field( __u32, isa )
),
TP_fast_assign(
__entry->rip = rip;
__entry->exit_code = exit_code;
__entry->exit_info1 = exit_info1;
__entry->exit_info2 = exit_info2;
__entry->exit_int_info = exit_int_info;
__entry->exit_int_info_err = exit_int_info_err;
__entry->isa = isa;
),
TP_printk("rip: 0x%016llx reason: %s%s%s ext_inf1: 0x%016llx "
"ext_inf2: 0x%016llx ext_int: 0x%08x ext_int_err: 0x%08x",
__entry->rip,
kvm_print_exit_reason(__entry->exit_code, __entry->isa),
__entry->exit_info1, __entry->exit_info2,
__entry->exit_int_info, __entry->exit_int_info_err)
);
TRACE_EVENT_KVM_EXIT(kvm_nested_vmexit);
/*
* Tracepoint for #VMEXIT reinjected to the guest

10
arch/x86/kvm/vmx/capabilities.h
View File

@ -151,7 +151,7 @@ static inline bool vmx_umip_emulated(void)
static inline bool cpu_has_vmx_rdtscp(void)
{
return vmcs_config.cpu_based_2nd_exec_ctrl &
SECONDARY_EXEC_RDTSCP;
SECONDARY_EXEC_ENABLE_RDTSCP;
}
static inline bool cpu_has_vmx_virtualize_x2apic_mode(void)
@ -196,7 +196,7 @@ static inline bool cpu_has_vmx_ple(void)
SECONDARY_EXEC_PAUSE_LOOP_EXITING;
}
static inline bool vmx_rdrand_supported(void)
static inline bool cpu_has_vmx_rdrand(void)
{
return vmcs_config.cpu_based_2nd_exec_ctrl &
SECONDARY_EXEC_RDRAND_EXITING;
@ -233,7 +233,7 @@ static inline bool cpu_has_vmx_encls_vmexit(void)
SECONDARY_EXEC_ENCLS_EXITING;
}
static inline bool vmx_rdseed_supported(void)
static inline bool cpu_has_vmx_rdseed(void)
{
return vmcs_config.cpu_based_2nd_exec_ctrl &
SECONDARY_EXEC_RDSEED_EXITING;
@ -244,13 +244,13 @@ static inline bool cpu_has_vmx_pml(void)
return vmcs_config.cpu_based_2nd_exec_ctrl & SECONDARY_EXEC_ENABLE_PML;
}
static inline bool vmx_xsaves_supported(void)
static inline bool cpu_has_vmx_xsaves(void)
{
return vmcs_config.cpu_based_2nd_exec_ctrl &
SECONDARY_EXEC_XSAVES;
}
static inline bool vmx_waitpkg_supported(void)
static inline bool cpu_has_vmx_waitpkg(void)
{
return vmcs_config.cpu_based_2nd_exec_ctrl &
SECONDARY_EXEC_ENABLE_USR_WAIT_PAUSE;

178
arch/x86/kvm/vmx/nested.c
View File

@ -233,6 +233,44 @@ static inline void nested_release_evmcs(struct kvm_vcpu *vcpu)
vmx->nested.hv_evmcs = NULL;
}
static void vmx_sync_vmcs_host_state(struct vcpu_vmx *vmx,
struct loaded_vmcs *prev)
{
struct vmcs_host_state *dest, *src;
if (unlikely(!vmx->guest_state_loaded))
return;
src = &prev->host_state;
dest = &vmx->loaded_vmcs->host_state;
vmx_set_host_fs_gs(dest, src->fs_sel, src->gs_sel, src->fs_base, src->gs_base);
dest->ldt_sel = src->ldt_sel;
#ifdef CONFIG_X86_64
dest->ds_sel = src->ds_sel;
dest->es_sel = src->es_sel;
#endif
}
static void vmx_switch_vmcs(struct kvm_vcpu *vcpu, struct loaded_vmcs *vmcs)
{
struct vcpu_vmx *vmx = to_vmx(vcpu);
struct loaded_vmcs *prev;
int cpu;
if (WARN_ON_ONCE(vmx->loaded_vmcs == vmcs))
return;
cpu = get_cpu();
prev = vmx->loaded_vmcs;
vmx->loaded_vmcs = vmcs;
vmx_vcpu_load_vmcs(vcpu, cpu, prev);
vmx_sync_vmcs_host_state(vmx, prev);
put_cpu();
vmx_register_cache_reset(vcpu);
}
/*
* Free whatever needs to be freed from vmx->nested when L1 goes down, or
* just stops using VMX.
@ -241,10 +279,13 @@ static void free_nested(struct kvm_vcpu *vcpu)
{
struct vcpu_vmx *vmx = to_vmx(vcpu);
if (WARN_ON_ONCE(vmx->loaded_vmcs != &vmx->vmcs01))
vmx_switch_vmcs(vcpu, &vmx->vmcs01);
if (!vmx->nested.vmxon && !vmx->nested.smm.vmxon)
return;
kvm_clear_request(KVM_REQ_GET_VMCS12_PAGES, vcpu);
kvm_clear_request(KVM_REQ_GET_NESTED_STATE_PAGES, vcpu);
vmx->nested.vmxon = false;
vmx->nested.smm.vmxon = false;
@ -277,44 +318,6 @@ static void free_nested(struct kvm_vcpu *vcpu)
free_loaded_vmcs(&vmx->nested.vmcs02);
}
static void vmx_sync_vmcs_host_state(struct vcpu_vmx *vmx,
struct loaded_vmcs *prev)
{
struct vmcs_host_state *dest, *src;
if (unlikely(!vmx->guest_state_loaded))
return;
src = &prev->host_state;
dest = &vmx->loaded_vmcs->host_state;
vmx_set_host_fs_gs(dest, src->fs_sel, src->gs_sel, src->fs_base, src->gs_base);
dest->ldt_sel = src->ldt_sel;
#ifdef CONFIG_X86_64
dest->ds_sel = src->ds_sel;
dest->es_sel = src->es_sel;
#endif
}
static void vmx_switch_vmcs(struct kvm_vcpu *vcpu, struct loaded_vmcs *vmcs)
{
struct vcpu_vmx *vmx = to_vmx(vcpu);
struct loaded_vmcs *prev;
int cpu;
if (vmx->loaded_vmcs == vmcs)
return;
cpu = get_cpu();
prev = vmx->loaded_vmcs;
vmx->loaded_vmcs = vmcs;
vmx_vcpu_load_vmcs(vcpu, cpu, prev);
vmx_sync_vmcs_host_state(vmx, prev);
put_cpu();
vmx_register_cache_reset(vcpu);
}
/*
* Ensure that the current vmcs of the logical processor is the
* vmcs01 of the vcpu before calling free_nested().
@ -323,8 +326,6 @@ void nested_vmx_free_vcpu(struct kvm_vcpu *vcpu)
{
vcpu_load(vcpu);
vmx_leave_nested(vcpu);
vmx_switch_vmcs(vcpu, &to_vmx(vcpu)->vmcs01);
free_nested(vcpu);
vcpu_put(vcpu);
}
@ -938,11 +939,11 @@ static bool nested_vmx_get_vmexit_msr_value(struct kvm_vcpu *vcpu,
* VM-exit in L0, use the more accurate value.
*/
if (msr_index == MSR_IA32_TSC) {
int index = vmx_find_msr_index(&vmx->msr_autostore.guest,
MSR_IA32_TSC);
int i = vmx_find_loadstore_msr_slot(&vmx->msr_autostore.guest,
MSR_IA32_TSC);
if (index >= 0) {
u64 val = vmx->msr_autostore.guest.val[index].value;
if (i >= 0) {
u64 val = vmx->msr_autostore.guest.val[i].value;
*data = kvm_read_l1_tsc(vcpu, val);
return true;
@ -1031,16 +1032,16 @@ static void prepare_vmx_msr_autostore_list(struct kvm_vcpu *vcpu,
struct vcpu_vmx *vmx = to_vmx(vcpu);
struct vmx_msrs *autostore = &vmx->msr_autostore.guest;
bool in_vmcs12_store_list;
int msr_autostore_index;
int msr_autostore_slot;
bool in_autostore_list;
int last;
msr_autostore_index = vmx_find_msr_index(autostore, msr_index);
in_autostore_list = msr_autostore_index >= 0;
msr_autostore_slot = vmx_find_loadstore_msr_slot(autostore, msr_index);
in_autostore_list = msr_autostore_slot >= 0;
in_vmcs12_store_list = nested_msr_store_list_has_msr(vcpu, msr_index);
if (in_vmcs12_store_list && !in_autostore_list) {
if (autostore->nr == NR_LOADSTORE_MSRS) {
if (autostore->nr == MAX_NR_LOADSTORE_MSRS) {
/*
* Emulated VMEntry does not fail here. Instead a less
* accurate value will be returned by
@ -1057,7 +1058,7 @@ static void prepare_vmx_msr_autostore_list(struct kvm_vcpu *vcpu,
autostore->val[last].index = msr_index;
} else if (!in_vmcs12_store_list && in_autostore_list) {
last = --autostore->nr;
autostore->val[msr_autostore_index] = autostore->val[last];
autostore->val[msr_autostore_slot] = autostore->val[last];
}
}
@ -2286,7 +2287,7 @@ static void prepare_vmcs02_early(struct vcpu_vmx *vmx, struct vmcs12 *vmcs12)
/* Take the following fields only from vmcs12 */
exec_control &= ~(SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES |
SECONDARY_EXEC_ENABLE_INVPCID |
SECONDARY_EXEC_RDTSCP |
SECONDARY_EXEC_ENABLE_RDTSCP |
SECONDARY_EXEC_XSAVES |
SECONDARY_EXEC_ENABLE_USR_WAIT_PAUSE |
SECONDARY_EXEC_VIRTUAL_INTR_DELIVERY |
@ -2314,6 +2315,9 @@ static void prepare_vmcs02_early(struct vcpu_vmx *vmx, struct vmcs12 *vmcs12)
vmcs_write16(GUEST_INTR_STATUS,
vmcs12->guest_intr_status);
if (!nested_cpu_has2(vmcs12, SECONDARY_EXEC_UNRESTRICTED_GUEST))
exec_control &= ~SECONDARY_EXEC_UNRESTRICTED_GUEST;
secondary_exec_controls_set(vmx, exec_control);
}
@ -2408,6 +2412,8 @@ static void prepare_vmcs02_rare(struct vcpu_vmx *vmx, struct vmcs12 *vmcs12)
vmcs_writel(GUEST_TR_BASE, vmcs12->guest_tr_base);
vmcs_writel(GUEST_GDTR_BASE, vmcs12->guest_gdtr_base);
vmcs_writel(GUEST_IDTR_BASE, vmcs12->guest_idtr_base);
vmx->segment_cache.bitmask = 0;
}
if (!hv_evmcs || !(hv_evmcs->hv_clean_fields &
@ -2571,7 +2577,7 @@ static int prepare_vmcs02(struct kvm_vcpu *vcpu, struct vmcs12 *vmcs12,
* which means L1 attempted VMEntry to L2 with invalid state.
* Fail the VMEntry.
*/
if (vmx->emulation_required) {
if (CC(!vmx_guest_state_valid(vcpu))) {
*entry_failure_code = ENTRY_FAIL_DEFAULT;
return -EINVAL;
}
@ -3344,8 +3350,10 @@ enum nvmx_vmentry_status nested_vmx_enter_non_root_mode(struct kvm_vcpu *vcpu,
prepare_vmcs02_early(vmx, vmcs12);
if (from_vmentry) {
if (unlikely(!nested_get_vmcs12_pages(vcpu)))
if (unlikely(!nested_get_vmcs12_pages(vcpu))) {
vmx_switch_vmcs(vcpu, &vmx->vmcs01);
return NVMX_VMENTRY_KVM_INTERNAL_ERROR;
}
if (nested_vmx_check_vmentry_hw(vcpu)) {
vmx_switch_vmcs(vcpu, &vmx->vmcs01);
@ -3387,7 +3395,7 @@ enum nvmx_vmentry_status nested_vmx_enter_non_root_mode(struct kvm_vcpu *vcpu,
* to nested_get_vmcs12_pages before the next VM-entry. The MSRs
* have already been set at vmentry time and should not be reset.
*/
kvm_make_request(KVM_REQ_GET_VMCS12_PAGES, vcpu);
kvm_make_request(KVM_REQ_GET_NESTED_STATE_PAGES, vcpu);
}
/*
@ -3468,11 +3476,11 @@ static int nested_vmx_run(struct kvm_vcpu *vcpu, bool launch)
if (evmptrld_status == EVMPTRLD_ERROR) {
kvm_queue_exception(vcpu, UD_VECTOR);
return 1;
} else if (evmptrld_status == EVMPTRLD_VMFAIL) {
} else if (CC(evmptrld_status == EVMPTRLD_VMFAIL)) {
return nested_vmx_failInvalid(vcpu);
}
if (!vmx->nested.hv_evmcs && vmx->nested.current_vmptr == -1ull)
if (CC(!vmx->nested.hv_evmcs && vmx->nested.current_vmptr == -1ull))
return nested_vmx_failInvalid(vcpu);
vmcs12 = get_vmcs12(vcpu);
@ -3483,7 +3491,7 @@ static int nested_vmx_run(struct kvm_vcpu *vcpu, bool launch)
* rather than RFLAGS.ZF, and no error number is stored to the
* VM-instruction error field.
*/
if (vmcs12->hdr.shadow_vmcs)
if (CC(vmcs12->hdr.shadow_vmcs))
return nested_vmx_failInvalid(vcpu);
if (vmx->nested.hv_evmcs) {
@ -3504,10 +3512,10 @@ static int nested_vmx_run(struct kvm_vcpu *vcpu, bool launch)
* for misconfigurations which will anyway be caught by the processor
* when using the merged vmcs02.
*/
if (interrupt_shadow & KVM_X86_SHADOW_INT_MOV_SS)
if (CC(interrupt_shadow & KVM_X86_SHADOW_INT_MOV_SS))
return nested_vmx_fail(vcpu, VMXERR_ENTRY_EVENTS_BLOCKED_BY_MOV_SS);
if (vmcs12->launch_state == launch)
if (CC(vmcs12->launch_state == launch))
return nested_vmx_fail(vcpu,
launch ? VMXERR_VMLAUNCH_NONCLEAR_VMCS
: VMXERR_VMRESUME_NONLAUNCHED_VMCS);
@ -3528,6 +3536,14 @@ static int nested_vmx_run(struct kvm_vcpu *vcpu, bool launch)
if (unlikely(status != NVMX_VMENTRY_SUCCESS))
goto vmentry_failed;
/* Emulate processing of posted interrupts on VM-Enter. */
if (nested_cpu_has_posted_intr(vmcs12) &&
kvm_apic_has_interrupt(vcpu) == vmx->nested.posted_intr_nv) {
vmx->nested.pi_pending = true;
kvm_make_request(KVM_REQ_EVENT, vcpu);
kvm_apic_clear_irr(vcpu, vmx->nested.posted_intr_nv);
}
/* Hide L1D cache contents from the nested guest. */
vmx->vcpu.arch.l1tf_flush_l1d = true;
@ -4257,7 +4273,7 @@ static void load_vmcs12_host_state(struct kvm_vcpu *vcpu,
static inline u64 nested_vmx_get_vmcs01_guest_efer(struct vcpu_vmx *vmx)
{
struct shared_msr_entry *efer_msr;
struct vmx_uret_msr *efer_msr;
unsigned int i;
if (vm_entry_controls_get(vmx) & VM_ENTRY_LOAD_IA32_EFER)
@ -4271,7 +4287,7 @@ static inline u64 nested_vmx_get_vmcs01_guest_efer(struct vcpu_vmx *vmx)
return vmx->msr_autoload.guest.val[i].value;
}
efer_msr = find_msr_entry(vmx, MSR_EFER);
efer_msr = vmx_find_uret_msr(vmx, MSR_EFER);
if (efer_msr)
return efer_msr->data;
@ -4696,7 +4712,7 @@ static int nested_vmx_get_vmptr(struct kvm_vcpu *vcpu, gpa_t *vmpointer,
r = kvm_read_guest_virt(vcpu, gva, vmpointer, sizeof(*vmpointer), &e);
if (r != X86EMUL_CONTINUE) {
*ret = vmx_handle_memory_failure(vcpu, r, &e);
*ret = kvm_handle_memory_failure(vcpu, r, &e);
return -EINVAL;
}
@ -4760,7 +4776,7 @@ static int enter_vmx_operation(struct kvm_vcpu *vcpu)
if (vmx_pt_mode_is_host_guest()) {
vmx->pt_desc.guest.ctl = 0;
pt_update_intercept_for_msr(vmx);
pt_update_intercept_for_msr(vcpu);
}
return 0;
@ -5003,7 +5019,7 @@ static int handle_vmread(struct kvm_vcpu *vcpu)
/* _system ok, nested_vmx_check_permission has verified cpl=0 */
r = kvm_write_guest_virt_system(vcpu, gva, &value, len, &e);
if (r != X86EMUL_CONTINUE)
return vmx_handle_memory_failure(vcpu, r, &e);
return kvm_handle_memory_failure(vcpu, r, &e);
}
return nested_vmx_succeed(vcpu);
@ -5076,7 +5092,7 @@ static int handle_vmwrite(struct kvm_vcpu *vcpu)
return 1;
r = kvm_read_guest_virt(vcpu, gva, &value, len, &e);
if (r != X86EMUL_CONTINUE)
return vmx_handle_memory_failure(vcpu, r, &e);
return kvm_handle_memory_failure(vcpu, r, &e);
}
field = kvm_register_readl(vcpu, (((instr_info) >> 28) & 0xf));
@ -5238,7 +5254,7 @@ static int handle_vmptrst(struct kvm_vcpu *vcpu)
r = kvm_write_guest_virt_system(vcpu, gva, (void *)&current_vmptr,
sizeof(gpa_t), &e);
if (r != X86EMUL_CONTINUE)
return vmx_handle_memory_failure(vcpu, r, &e);
return kvm_handle_memory_failure(vcpu, r, &e);
return nested_vmx_succeed(vcpu);
}
@ -5291,7 +5307,7 @@ static int handle_invept(struct kvm_vcpu *vcpu)
return 1;
r = kvm_read_guest_virt(vcpu, gva, &operand, sizeof(operand), &e);
if (r != X86EMUL_CONTINUE)
return vmx_handle_memory_failure(vcpu, r, &e);
return kvm_handle_memory_failure(vcpu, r, &e);
/*
* Nested EPT roots are always held through guest_mmu,
@ -5373,7 +5389,7 @@ static int handle_invvpid(struct kvm_vcpu *vcpu)
return 1;
r = kvm_read_guest_virt(vcpu, gva, &operand, sizeof(operand), &e);
if (r != X86EMUL_CONTINUE)
return vmx_handle_memory_failure(vcpu, r, &e);
return kvm_handle_memory_failure(vcpu, r, &e);
if (operand.vpid >> 16)
return nested_vmx_fail(vcpu,
@ -5918,13 +5934,7 @@ bool nested_vmx_reflect_vmexit(struct kvm_vcpu *vcpu)
goto reflect_vmexit;
}
exit_intr_info = vmx_get_intr_info(vcpu);
exit_qual = vmx_get_exit_qual(vcpu);
trace_kvm_nested_vmexit(kvm_rip_read(vcpu), exit_reason, exit_qual,
vmx->idt_vectoring_info, exit_intr_info,
vmcs_read32(VM_EXIT_INTR_ERROR_CODE),
KVM_ISA_VMX);
trace_kvm_nested_vmexit(exit_reason, vcpu, KVM_ISA_VMX);
/* If L0 (KVM) wants the exit, it trumps L1's desires. */
if (nested_vmx_l0_wants_exit(vcpu, exit_reason))
@ -5940,14 +5950,14 @@ bool nested_vmx_reflect_vmexit(struct kvm_vcpu *vcpu)
* need to be synthesized by querying the in-kernel LAPIC, but external
* interrupts are never reflected to L1 so it's a non-issue.
*/
if ((exit_intr_info &
(INTR_INFO_VALID_MASK | INTR_INFO_DELIVER_CODE_MASK)) ==
(INTR_INFO_VALID_MASK | INTR_INFO_DELIVER_CODE_MASK)) {
exit_intr_info = vmx_get_intr_info(vcpu);
if (is_exception_with_error_code(exit_intr_info)) {
struct vmcs12 *vmcs12 = get_vmcs12(vcpu);
vmcs12->vm_exit_intr_error_code =
vmcs_read32(VM_EXIT_INTR_ERROR_CODE);
}
exit_qual = vmx_get_exit_qual(vcpu);
reflect_vmexit:
nested_vmx_vmexit(vcpu, exit_reason, exit_intr_info, exit_qual);
@ -6182,7 +6192,7 @@ static int vmx_set_nested_state(struct kvm_vcpu *vcpu,
* restored yet. EVMCS will be mapped from
* nested_get_vmcs12_pages().
*/
kvm_make_request(KVM_REQ_GET_VMCS12_PAGES, vcpu);
kvm_make_request(KVM_REQ_GET_NESTED_STATE_PAGES, vcpu);
} else {
return -EINVAL;
}
@ -6318,7 +6328,8 @@ void nested_vmx_setup_ctls_msrs(struct nested_vmx_msrs *msrs, u32 ept_caps)
#ifdef CONFIG_X86_64
VM_EXIT_HOST_ADDR_SPACE_SIZE |
#endif
VM_EXIT_LOAD_IA32_PAT | VM_EXIT_SAVE_IA32_PAT;
VM_EXIT_LOAD_IA32_PAT | VM_EXIT_SAVE_IA32_PAT |
VM_EXIT_CLEAR_BNDCFGS | VM_EXIT_LOAD_IA32_PERF_GLOBAL_CTRL;
msrs->exit_ctls_high |=
VM_EXIT_ALWAYSON_WITHOUT_TRUE_MSR |
VM_EXIT_LOAD_IA32_EFER | VM_EXIT_SAVE_IA32_EFER |
@ -6337,7 +6348,8 @@ void nested_vmx_setup_ctls_msrs(struct nested_vmx_msrs *msrs, u32 ept_caps)
#ifdef CONFIG_X86_64
VM_ENTRY_IA32E_MODE |
#endif
VM_ENTRY_LOAD_IA32_PAT;
VM_ENTRY_LOAD_IA32_PAT | VM_ENTRY_LOAD_BNDCFGS |
VM_ENTRY_LOAD_IA32_PERF_GLOBAL_CTRL;
msrs->entry_ctls_high |=
(VM_ENTRY_ALWAYSON_WITHOUT_TRUE_MSR | VM_ENTRY_LOAD_IA32_EFER);
@ -6391,7 +6403,7 @@ void nested_vmx_setup_ctls_msrs(struct nested_vmx_msrs *msrs, u32 ept_caps)
msrs->secondary_ctls_low = 0;
msrs->secondary_ctls_high &=
SECONDARY_EXEC_DESC |
SECONDARY_EXEC_RDTSCP |
SECONDARY_EXEC_ENABLE_RDTSCP |
SECONDARY_EXEC_VIRTUALIZE_X2APIC_MODE |
SECONDARY_EXEC_WBINVD_EXITING |
SECONDARY_EXEC_APIC_REGISTER_VIRT |
@ -6561,7 +6573,7 @@ struct kvm_x86_nested_ops vmx_nested_ops = {
.hv_timer_pending = nested_vmx_preemption_timer_pending,
.get_state = vmx_get_nested_state,
.set_state = vmx_set_nested_state,
.get_vmcs12_pages = nested_get_vmcs12_pages,
.get_nested_state_pages = nested_get_vmcs12_pages,
.write_log_dirty = nested_vmx_write_pml_buffer,
.enable_evmcs = nested_enable_evmcs,
.get_evmcs_version = nested_get_evmcs_version,

332
arch/x86/kvm/vmx/posted_intr.c Normal file
View File

@ -0,0 +1,332 @@
// SPDX-License-Identifier: GPL-2.0-only
#include <linux/kvm_host.h>
#include <asm/irq_remapping.h>
#include <asm/cpu.h>
#include "lapic.h"
#include "posted_intr.h"
#include "trace.h"
#include "vmx.h"
/*
* We maintian a per-CPU linked-list of vCPU, so in wakeup_handler() we
* can find which vCPU should be waken up.
*/
static DEFINE_PER_CPU(struct list_head, blocked_vcpu_on_cpu);
static DEFINE_PER_CPU(spinlock_t, blocked_vcpu_on_cpu_lock);
static inline struct pi_desc *vcpu_to_pi_desc(struct kvm_vcpu *vcpu)
{
return &(to_vmx(vcpu)->pi_desc);
}
void vmx_vcpu_pi_load(struct kvm_vcpu *vcpu, int cpu)
{
struct pi_desc *pi_desc = vcpu_to_pi_desc(vcpu);
struct pi_desc old, new;
unsigned int dest;
/*
* In case of hot-plug or hot-unplug, we may have to undo
* vmx_vcpu_pi_put even if there is no assigned device. And we
* always keep PI.NDST up to date for simplicity: it makes the
* code easier, and CPU migration is not a fast path.
*/
if (!pi_test_sn(pi_desc) && vcpu->cpu == cpu)
return;
/*
* If the 'nv' field is POSTED_INTR_WAKEUP_VECTOR, do not change
* PI.NDST: pi_post_block is the one expected to change PID.NDST and the
* wakeup handler expects the vCPU to be on the blocked_vcpu_list that
* matches PI.NDST. Otherwise, a vcpu may not be able to be woken up
* correctly.
*/
if (pi_desc->nv == POSTED_INTR_WAKEUP_VECTOR || vcpu->cpu == cpu) {
pi_clear_sn(pi_desc);
goto after_clear_sn;
}
/* The full case. */
do {
old.control = new.control = pi_desc->control;
dest = cpu_physical_id(cpu);
if (x2apic_enabled())
new.ndst = dest;
else
new.ndst = (dest << 8) & 0xFF00;
new.sn = 0;
} while (cmpxchg64(&pi_desc->control, old.control,
new.control) != old.control);
after_clear_sn:
/*
* Clear SN before reading the bitmap. The VT-d firmware
* writes the bitmap and reads SN atomically (5.2.3 in the
* spec), so it doesn't really have a memory barrier that
* pairs with this, but we cannot do that and we need one.
*/
smp_mb__after_atomic();
if (!pi_is_pir_empty(pi_desc))
pi_set_on(pi_desc);
}
void vmx_vcpu_pi_put(struct kvm_vcpu *vcpu)
{
struct pi_desc *pi_desc = vcpu_to_pi_desc(vcpu);
if (!kvm_arch_has_assigned_device(vcpu->kvm) ||
!irq_remapping_cap(IRQ_POSTING_CAP) ||
!kvm_vcpu_apicv_active(vcpu))
return;
/* Set SN when the vCPU is preempted */
if (vcpu->preempted)
pi_set_sn(pi_desc);
}
static void __pi_post_block(struct kvm_vcpu *vcpu)
{
struct pi_desc *pi_desc = vcpu_to_pi_desc(vcpu);
struct pi_desc old, new;
unsigned int dest;
do {
old.control = new.control = pi_desc->control;
WARN(old.nv != POSTED_INTR_WAKEUP_VECTOR,
"Wakeup handler not enabled while the VCPU is blocked\n");
dest = cpu_physical_id(vcpu->cpu);
if (x2apic_enabled())
new.ndst = dest;
else
new.ndst = (dest << 8) & 0xFF00;
/* set 'NV' to 'notification vector' */
new.nv = POSTED_INTR_VECTOR;
} while (cmpxchg64(&pi_desc->control, old.control,
new.control) != old.control);
if (!WARN_ON_ONCE(vcpu->pre_pcpu == -1)) {
spin_lock(&per_cpu(blocked_vcpu_on_cpu_lock, vcpu->pre_pcpu));
list_del(&vcpu->blocked_vcpu_list);
spin_unlock(&per_cpu(blocked_vcpu_on_cpu_lock, vcpu->pre_pcpu));
vcpu->pre_pcpu = -1;
}
}
/*
* This routine does the following things for vCPU which is going
* to be blocked if VT-d PI is enabled.
* - Store the vCPU to the wakeup list, so when interrupts happen
* we can find the right vCPU to wake up.
* - Change the Posted-interrupt descriptor as below:
* 'NDST' <-- vcpu->pre_pcpu
* 'NV' <-- POSTED_INTR_WAKEUP_VECTOR
* - If 'ON' is set during this process, which means at least one
* interrupt is posted for this vCPU, we cannot block it, in
* this case, return 1, otherwise, return 0.
*
*/
int pi_pre_block(struct kvm_vcpu *vcpu)
{
unsigned int dest;
struct pi_desc old, new;
struct pi_desc *pi_desc = vcpu_to_pi_desc(vcpu);
if (!kvm_arch_has_assigned_device(vcpu->kvm) ||
!irq_remapping_cap(IRQ_POSTING_CAP) ||
!kvm_vcpu_apicv_active(vcpu))
return 0;
WARN_ON(irqs_disabled());
local_irq_disable();
if (!WARN_ON_ONCE(vcpu->pre_pcpu != -1)) {
vcpu->pre_pcpu = vcpu->cpu;
spin_lock(&per_cpu(blocked_vcpu_on_cpu_lock, vcpu->pre_pcpu));
list_add_tail(&vcpu->blocked_vcpu_list,
&per_cpu(blocked_vcpu_on_cpu,
vcpu->pre_pcpu));
spin_unlock(&per_cpu(blocked_vcpu_on_cpu_lock, vcpu->pre_pcpu));
}
do {
old.control = new.control = pi_desc->control;
WARN((pi_desc->sn == 1),
"Warning: SN field of posted-interrupts "
"is set before blocking\n");
/*
* Since vCPU can be preempted during this process,
* vcpu->cpu could be different with pre_pcpu, we
* need to set pre_pcpu as the destination of wakeup
* notification event, then we can find the right vCPU
* to wakeup in wakeup handler if interrupts happen
* when the vCPU is in blocked state.
*/
dest = cpu_physical_id(vcpu->pre_pcpu);
if (x2apic_enabled())
new.ndst = dest;
else
new.ndst = (dest << 8) & 0xFF00;
/* set 'NV' to 'wakeup vector' */
new.nv = POSTED_INTR_WAKEUP_VECTOR;
} while (cmpxchg64(&pi_desc->control, old.control,
new.control) != old.control);
/* We should not block the vCPU if an interrupt is posted for it. */
if (pi_test_on(pi_desc) == 1)
__pi_post_block(vcpu);
local_irq_enable();
return (vcpu->pre_pcpu == -1);
}
void pi_post_block(struct kvm_vcpu *vcpu)
{
if (vcpu->pre_pcpu == -1)
return;
WARN_ON(irqs_disabled());
local_irq_disable();
__pi_post_block(vcpu);
local_irq_enable();
}
/*
* Handler for POSTED_INTERRUPT_WAKEUP_VECTOR.
*/
void pi_wakeup_handler(void)
{
struct kvm_vcpu *vcpu;
int cpu = smp_processor_id();
spin_lock(&per_cpu(blocked_vcpu_on_cpu_lock, cpu));
list_for_each_entry(vcpu, &per_cpu(blocked_vcpu_on_cpu, cpu),
blocked_vcpu_list) {
struct pi_desc *pi_desc = vcpu_to_pi_desc(vcpu);
if (pi_test_on(pi_desc) == 1)
kvm_vcpu_kick(vcpu);
}
spin_unlock(&per_cpu(blocked_vcpu_on_cpu_lock, cpu));
}
void __init pi_init(int cpu)
{
INIT_LIST_HEAD(&per_cpu(blocked_vcpu_on_cpu, cpu));
spin_lock_init(&per_cpu(blocked_vcpu_on_cpu_lock, cpu));
}
bool pi_has_pending_interrupt(struct kvm_vcpu *vcpu)
{
struct pi_desc *pi_desc = vcpu_to_pi_desc(vcpu);
return pi_test_on(pi_desc) ||
(pi_test_sn(pi_desc) && !pi_is_pir_empty(pi_desc));
}
/*
* pi_update_irte - set IRTE for Posted-Interrupts
*
* @kvm: kvm
* @host_irq: host irq of the interrupt
* @guest_irq: gsi of the interrupt
* @set: set or unset PI
* returns 0 on success, < 0 on failure
*/
int pi_update_irte(struct kvm *kvm, unsigned int host_irq, uint32_t guest_irq,
bool set)
{
struct kvm_kernel_irq_routing_entry *e;
struct kvm_irq_routing_table *irq_rt;
struct kvm_lapic_irq irq;
struct kvm_vcpu *vcpu;
struct vcpu_data vcpu_info;
int idx, ret = 0;
if (!kvm_arch_has_assigned_device(kvm) ||
!irq_remapping_cap(IRQ_POSTING_CAP) ||
!kvm_vcpu_apicv_active(kvm->vcpus[0]))
return 0;
idx = srcu_read_lock(&kvm->irq_srcu);
irq_rt = srcu_dereference(kvm->irq_routing, &kvm->irq_srcu);
if (guest_irq >= irq_rt->nr_rt_entries ||
hlist_empty(&irq_rt->map[guest_irq])) {
pr_warn_once("no route for guest_irq %u/%u (broken user space?)\n",
guest_irq, irq_rt->nr_rt_entries);
goto out;
}
hlist_for_each_entry(e, &irq_rt->map[guest_irq], link) {
if (e->type != KVM_IRQ_ROUTING_MSI)
continue;
/*
* VT-d PI cannot support posting multicast/broadcast
* interrupts to a vCPU, we still use interrupt remapping
* for these kind of interrupts.
*
* For lowest-priority interrupts, we only support
* those with single CPU as the destination, e.g. user
* configures the interrupts via /proc/irq or uses
* irqbalance to make the interrupts single-CPU.
*
* We will support full lowest-priority interrupt later.
*
* In addition, we can only inject generic interrupts using
* the PI mechanism, refuse to route others through it.
*/
kvm_set_msi_irq(kvm, e, &irq);
if (!kvm_intr_is_single_vcpu(kvm, &irq, &vcpu) ||
!kvm_irq_is_postable(&irq)) {
/*
* Make sure the IRTE is in remapped mode if
* we don't handle it in posted mode.
*/
ret = irq_set_vcpu_affinity(host_irq, NULL);
if (ret < 0) {
printk(KERN_INFO
"failed to back to remapped mode, irq: %u\n",
host_irq);
goto out;
}
continue;
}
vcpu_info.pi_desc_addr = __pa(&to_vmx(vcpu)->pi_desc);
vcpu_info.vector = irq.vector;
trace_kvm_pi_irte_update(host_irq, vcpu->vcpu_id, e->gsi,
vcpu_info.vector, vcpu_info.pi_desc_addr, set);
if (set)
ret = irq_set_vcpu_affinity(host_irq, &vcpu_info);
else
ret = irq_set_vcpu_affinity(host_irq, NULL);
if (ret < 0) {
printk(KERN_INFO "%s: failed to update PI IRTE\n",
__func__);
goto out;
}
}
ret = 0;
out:
srcu_read_unlock(&kvm->irq_srcu, idx);
return ret;
}

99
arch/x86/kvm/vmx/posted_intr.h Normal file
View File

@ -0,0 +1,99 @@
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __KVM_X86_VMX_POSTED_INTR_H
#define __KVM_X86_VMX_POSTED_INTR_H
#define POSTED_INTR_ON 0
#define POSTED_INTR_SN 1
/* Posted-Interrupt Descriptor */
struct pi_desc {
u32 pir[8]; /* Posted interrupt requested */
union {
struct {
/* bit 256 - Outstanding Notification */
u16 on : 1,
/* bit 257 - Suppress Notification */
sn : 1,
/* bit 271:258 - Reserved */
rsvd_1 : 14;
/* bit 279:272 - Notification Vector */
u8 nv;
/* bit 287:280 - Reserved */
u8 rsvd_2;
/* bit 319:288 - Notification Destination */
u32 ndst;
};
u64 control;
};
u32 rsvd[6];
} __aligned(64);
static inline bool pi_test_and_set_on(struct pi_desc *pi_desc)
{
return test_and_set_bit(POSTED_INTR_ON,
(unsigned long *)&pi_desc->control);
}
static inline bool pi_test_and_clear_on(struct pi_desc *pi_desc)
{
return test_and_clear_bit(POSTED_INTR_ON,
(unsigned long *)&pi_desc->control);
}
static inline int pi_test_and_set_pir(int vector, struct pi_desc *pi_desc)
{
return test_and_set_bit(vector, (unsigned long *)pi_desc->pir);
}
static inline bool pi_is_pir_empty(struct pi_desc *pi_desc)
{
return bitmap_empty((unsigned long *)pi_desc->pir, NR_VECTORS);
}
static inline void pi_set_sn(struct pi_desc *pi_desc)
{
set_bit(POSTED_INTR_SN,
(unsigned long *)&pi_desc->control);
}
static inline void pi_set_on(struct pi_desc *pi_desc)
{
set_bit(POSTED_INTR_ON,
(unsigned long *)&pi_desc->control);
}
static inline void pi_clear_on(struct pi_desc *pi_desc)
{
clear_bit(POSTED_INTR_ON,
(unsigned long *)&pi_desc->control);
}
static inline void pi_clear_sn(struct pi_desc *pi_desc)
{
clear_bit(POSTED_INTR_SN,
(unsigned long *)&pi_desc->control);
}
static inline int pi_test_on(struct pi_desc *pi_desc)
{
return test_bit(POSTED_INTR_ON,
(unsigned long *)&pi_desc->control);
}
static inline int pi_test_sn(struct pi_desc *pi_desc)
{
return test_bit(POSTED_INTR_SN,
(unsigned long *)&pi_desc->control);
}
void vmx_vcpu_pi_load(struct kvm_vcpu *vcpu, int cpu);
void vmx_vcpu_pi_put(struct kvm_vcpu *vcpu);
int pi_pre_block(struct kvm_vcpu *vcpu);
void pi_post_block(struct kvm_vcpu *vcpu);
void pi_wakeup_handler(void);
void __init pi_init(int cpu);
bool pi_has_pending_interrupt(struct kvm_vcpu *vcpu);
int pi_update_irte(struct kvm *kvm, unsigned int host_irq, uint32_t guest_irq,
bool set);
#endif /* __KVM_X86_VMX_POSTED_INTR_H */

7
arch/x86/kvm/vmx/vmcs.h
View File

@ -138,6 +138,13 @@ static inline bool is_external_intr(u32 intr_info)
return is_intr_type(intr_info, INTR_TYPE_EXT_INTR);
}
static inline bool is_exception_with_error_code(u32 intr_info)
{
const u32 mask = INTR_INFO_VALID_MASK | INTR_INFO_DELIVER_CODE_MASK;
return (intr_info & mask) == mask;
}
enum vmcs_field_width {
VMCS_FIELD_WIDTH_U16 = 0,
VMCS_FIELD_WIDTH_U64 = 1,

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