mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-06 04:16:39 +07:00
16175a796d
vmx_set_msr() does not allow i386 guests to touch EFER, but they can still do so through the default: label in the switch. If they set EFER_LME, they can oops the host. Fix by having EFER access through the normal channel (which will check for EFER_LME) even on i386. Reported-and-tested-by: Benjamin Gilbert <bgilbert@cs.cmu.edu> Cc: stable@kernel.org Signed-off-by: Avi Kivity <avi@redhat.com>
3784 lines
96 KiB
C
3784 lines
96 KiB
C
/*
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* Kernel-based Virtual Machine driver for Linux
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*
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* This module enables machines with Intel VT-x extensions to run virtual
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* machines without emulation or binary translation.
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*
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* Copyright (C) 2006 Qumranet, Inc.
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*
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* Authors:
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* Avi Kivity <avi@qumranet.com>
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* Yaniv Kamay <yaniv@qumranet.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2. See
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* the COPYING file in the top-level directory.
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*
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*/
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#include "irq.h"
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#include "mmu.h"
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#include <linux/kvm_host.h>
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/mm.h>
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#include <linux/highmem.h>
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#include <linux/sched.h>
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#include <linux/moduleparam.h>
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#include "kvm_cache_regs.h"
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#include "x86.h"
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#include <asm/io.h>
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#include <asm/desc.h>
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#include <asm/vmx.h>
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#include <asm/virtext.h>
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#define __ex(x) __kvm_handle_fault_on_reboot(x)
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MODULE_AUTHOR("Qumranet");
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MODULE_LICENSE("GPL");
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static int bypass_guest_pf = 1;
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module_param(bypass_guest_pf, bool, 0);
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static int enable_vpid = 1;
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module_param(enable_vpid, bool, 0);
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static int flexpriority_enabled = 1;
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module_param(flexpriority_enabled, bool, 0);
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static int enable_ept = 1;
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module_param(enable_ept, bool, 0);
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static int emulate_invalid_guest_state = 0;
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module_param(emulate_invalid_guest_state, bool, 0);
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struct vmcs {
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u32 revision_id;
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u32 abort;
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char data[0];
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};
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struct vcpu_vmx {
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struct kvm_vcpu vcpu;
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struct list_head local_vcpus_link;
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unsigned long host_rsp;
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int launched;
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u8 fail;
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u32 idt_vectoring_info;
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struct kvm_msr_entry *guest_msrs;
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struct kvm_msr_entry *host_msrs;
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int nmsrs;
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int save_nmsrs;
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int msr_offset_efer;
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#ifdef CONFIG_X86_64
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int msr_offset_kernel_gs_base;
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#endif
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struct vmcs *vmcs;
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struct {
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int loaded;
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u16 fs_sel, gs_sel, ldt_sel;
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int gs_ldt_reload_needed;
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int fs_reload_needed;
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int guest_efer_loaded;
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} host_state;
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struct {
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struct {
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bool pending;
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u8 vector;
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unsigned rip;
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} irq;
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} rmode;
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int vpid;
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bool emulation_required;
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enum emulation_result invalid_state_emulation_result;
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/* Support for vnmi-less CPUs */
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int soft_vnmi_blocked;
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ktime_t entry_time;
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s64 vnmi_blocked_time;
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};
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static inline struct vcpu_vmx *to_vmx(struct kvm_vcpu *vcpu)
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{
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return container_of(vcpu, struct vcpu_vmx, vcpu);
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}
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static int init_rmode(struct kvm *kvm);
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static u64 construct_eptp(unsigned long root_hpa);
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static DEFINE_PER_CPU(struct vmcs *, vmxarea);
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static DEFINE_PER_CPU(struct vmcs *, current_vmcs);
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static DEFINE_PER_CPU(struct list_head, vcpus_on_cpu);
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static struct page *vmx_io_bitmap_a;
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static struct page *vmx_io_bitmap_b;
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static struct page *vmx_msr_bitmap;
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static DECLARE_BITMAP(vmx_vpid_bitmap, VMX_NR_VPIDS);
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static DEFINE_SPINLOCK(vmx_vpid_lock);
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static struct vmcs_config {
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int size;
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int order;
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u32 revision_id;
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u32 pin_based_exec_ctrl;
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u32 cpu_based_exec_ctrl;
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u32 cpu_based_2nd_exec_ctrl;
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u32 vmexit_ctrl;
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u32 vmentry_ctrl;
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} vmcs_config;
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static struct vmx_capability {
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u32 ept;
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u32 vpid;
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} vmx_capability;
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#define VMX_SEGMENT_FIELD(seg) \
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[VCPU_SREG_##seg] = { \
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.selector = GUEST_##seg##_SELECTOR, \
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.base = GUEST_##seg##_BASE, \
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.limit = GUEST_##seg##_LIMIT, \
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.ar_bytes = GUEST_##seg##_AR_BYTES, \
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}
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static struct kvm_vmx_segment_field {
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unsigned selector;
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unsigned base;
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unsigned limit;
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unsigned ar_bytes;
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} kvm_vmx_segment_fields[] = {
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VMX_SEGMENT_FIELD(CS),
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VMX_SEGMENT_FIELD(DS),
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VMX_SEGMENT_FIELD(ES),
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VMX_SEGMENT_FIELD(FS),
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VMX_SEGMENT_FIELD(GS),
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VMX_SEGMENT_FIELD(SS),
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VMX_SEGMENT_FIELD(TR),
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VMX_SEGMENT_FIELD(LDTR),
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};
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/*
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* Keep MSR_K6_STAR at the end, as setup_msrs() will try to optimize it
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* away by decrementing the array size.
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*/
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static const u32 vmx_msr_index[] = {
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#ifdef CONFIG_X86_64
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MSR_SYSCALL_MASK, MSR_LSTAR, MSR_CSTAR, MSR_KERNEL_GS_BASE,
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#endif
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MSR_EFER, MSR_K6_STAR,
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};
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#define NR_VMX_MSR ARRAY_SIZE(vmx_msr_index)
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static void load_msrs(struct kvm_msr_entry *e, int n)
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{
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int i;
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for (i = 0; i < n; ++i)
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wrmsrl(e[i].index, e[i].data);
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}
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static void save_msrs(struct kvm_msr_entry *e, int n)
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{
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int i;
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for (i = 0; i < n; ++i)
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rdmsrl(e[i].index, e[i].data);
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}
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static inline int is_page_fault(u32 intr_info)
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{
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return (intr_info & (INTR_INFO_INTR_TYPE_MASK | INTR_INFO_VECTOR_MASK |
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INTR_INFO_VALID_MASK)) ==
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(INTR_TYPE_HARD_EXCEPTION | PF_VECTOR | INTR_INFO_VALID_MASK);
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}
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static inline int is_no_device(u32 intr_info)
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{
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return (intr_info & (INTR_INFO_INTR_TYPE_MASK | INTR_INFO_VECTOR_MASK |
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INTR_INFO_VALID_MASK)) ==
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(INTR_TYPE_HARD_EXCEPTION | NM_VECTOR | INTR_INFO_VALID_MASK);
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}
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static inline int is_invalid_opcode(u32 intr_info)
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{
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return (intr_info & (INTR_INFO_INTR_TYPE_MASK | INTR_INFO_VECTOR_MASK |
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INTR_INFO_VALID_MASK)) ==
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(INTR_TYPE_HARD_EXCEPTION | UD_VECTOR | INTR_INFO_VALID_MASK);
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}
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static inline int is_external_interrupt(u32 intr_info)
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{
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return (intr_info & (INTR_INFO_INTR_TYPE_MASK | INTR_INFO_VALID_MASK))
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== (INTR_TYPE_EXT_INTR | INTR_INFO_VALID_MASK);
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}
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static inline int cpu_has_vmx_msr_bitmap(void)
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{
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return (vmcs_config.cpu_based_exec_ctrl & CPU_BASED_USE_MSR_BITMAPS);
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}
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static inline int cpu_has_vmx_tpr_shadow(void)
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{
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return (vmcs_config.cpu_based_exec_ctrl & CPU_BASED_TPR_SHADOW);
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}
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static inline int vm_need_tpr_shadow(struct kvm *kvm)
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{
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return ((cpu_has_vmx_tpr_shadow()) && (irqchip_in_kernel(kvm)));
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}
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static inline int cpu_has_secondary_exec_ctrls(void)
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{
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return (vmcs_config.cpu_based_exec_ctrl &
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CPU_BASED_ACTIVATE_SECONDARY_CONTROLS);
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}
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static inline bool cpu_has_vmx_virtualize_apic_accesses(void)
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{
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return flexpriority_enabled
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&& (vmcs_config.cpu_based_2nd_exec_ctrl &
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SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES);
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}
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static inline int cpu_has_vmx_invept_individual_addr(void)
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{
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return (!!(vmx_capability.ept & VMX_EPT_EXTENT_INDIVIDUAL_BIT));
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}
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static inline int cpu_has_vmx_invept_context(void)
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{
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return (!!(vmx_capability.ept & VMX_EPT_EXTENT_CONTEXT_BIT));
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}
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static inline int cpu_has_vmx_invept_global(void)
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{
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return (!!(vmx_capability.ept & VMX_EPT_EXTENT_GLOBAL_BIT));
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}
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static inline int cpu_has_vmx_ept(void)
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{
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return (vmcs_config.cpu_based_2nd_exec_ctrl &
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SECONDARY_EXEC_ENABLE_EPT);
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}
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static inline int vm_need_ept(void)
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{
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return (cpu_has_vmx_ept() && enable_ept);
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}
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static inline int vm_need_virtualize_apic_accesses(struct kvm *kvm)
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{
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return ((cpu_has_vmx_virtualize_apic_accesses()) &&
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(irqchip_in_kernel(kvm)));
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}
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static inline int cpu_has_vmx_vpid(void)
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{
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return (vmcs_config.cpu_based_2nd_exec_ctrl &
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SECONDARY_EXEC_ENABLE_VPID);
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}
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static inline int cpu_has_virtual_nmis(void)
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{
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return vmcs_config.pin_based_exec_ctrl & PIN_BASED_VIRTUAL_NMIS;
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}
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static int __find_msr_index(struct vcpu_vmx *vmx, u32 msr)
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{
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int i;
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for (i = 0; i < vmx->nmsrs; ++i)
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if (vmx->guest_msrs[i].index == msr)
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return i;
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return -1;
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}
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static inline void __invvpid(int ext, u16 vpid, gva_t gva)
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{
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struct {
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u64 vpid : 16;
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u64 rsvd : 48;
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u64 gva;
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} operand = { vpid, 0, gva };
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asm volatile (__ex(ASM_VMX_INVVPID)
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/* CF==1 or ZF==1 --> rc = -1 */
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"; ja 1f ; ud2 ; 1:"
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: : "a"(&operand), "c"(ext) : "cc", "memory");
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}
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static inline void __invept(int ext, u64 eptp, gpa_t gpa)
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{
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struct {
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u64 eptp, gpa;
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} operand = {eptp, gpa};
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asm volatile (__ex(ASM_VMX_INVEPT)
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/* CF==1 or ZF==1 --> rc = -1 */
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"; ja 1f ; ud2 ; 1:\n"
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: : "a" (&operand), "c" (ext) : "cc", "memory");
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}
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static struct kvm_msr_entry *find_msr_entry(struct vcpu_vmx *vmx, u32 msr)
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{
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int i;
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i = __find_msr_index(vmx, msr);
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if (i >= 0)
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return &vmx->guest_msrs[i];
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return NULL;
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}
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static void vmcs_clear(struct vmcs *vmcs)
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{
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u64 phys_addr = __pa(vmcs);
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u8 error;
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asm volatile (__ex(ASM_VMX_VMCLEAR_RAX) "; setna %0"
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: "=g"(error) : "a"(&phys_addr), "m"(phys_addr)
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: "cc", "memory");
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if (error)
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printk(KERN_ERR "kvm: vmclear fail: %p/%llx\n",
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vmcs, phys_addr);
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}
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static void __vcpu_clear(void *arg)
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{
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struct vcpu_vmx *vmx = arg;
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int cpu = raw_smp_processor_id();
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if (vmx->vcpu.cpu == cpu)
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vmcs_clear(vmx->vmcs);
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if (per_cpu(current_vmcs, cpu) == vmx->vmcs)
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per_cpu(current_vmcs, cpu) = NULL;
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rdtscll(vmx->vcpu.arch.host_tsc);
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list_del(&vmx->local_vcpus_link);
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vmx->vcpu.cpu = -1;
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vmx->launched = 0;
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}
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static void vcpu_clear(struct vcpu_vmx *vmx)
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{
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if (vmx->vcpu.cpu == -1)
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return;
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smp_call_function_single(vmx->vcpu.cpu, __vcpu_clear, vmx, 1);
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}
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static inline void vpid_sync_vcpu_all(struct vcpu_vmx *vmx)
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{
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if (vmx->vpid == 0)
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return;
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__invvpid(VMX_VPID_EXTENT_SINGLE_CONTEXT, vmx->vpid, 0);
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}
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static inline void ept_sync_global(void)
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{
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if (cpu_has_vmx_invept_global())
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__invept(VMX_EPT_EXTENT_GLOBAL, 0, 0);
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}
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static inline void ept_sync_context(u64 eptp)
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{
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if (vm_need_ept()) {
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if (cpu_has_vmx_invept_context())
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__invept(VMX_EPT_EXTENT_CONTEXT, eptp, 0);
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else
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ept_sync_global();
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}
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}
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static inline void ept_sync_individual_addr(u64 eptp, gpa_t gpa)
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{
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if (vm_need_ept()) {
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if (cpu_has_vmx_invept_individual_addr())
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__invept(VMX_EPT_EXTENT_INDIVIDUAL_ADDR,
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eptp, gpa);
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else
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ept_sync_context(eptp);
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}
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}
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static unsigned long vmcs_readl(unsigned long field)
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{
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unsigned long value;
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asm volatile (__ex(ASM_VMX_VMREAD_RDX_RAX)
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: "=a"(value) : "d"(field) : "cc");
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return value;
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}
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static u16 vmcs_read16(unsigned long field)
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{
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return vmcs_readl(field);
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}
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static u32 vmcs_read32(unsigned long field)
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{
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return vmcs_readl(field);
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}
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static u64 vmcs_read64(unsigned long field)
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{
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#ifdef CONFIG_X86_64
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return vmcs_readl(field);
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#else
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return vmcs_readl(field) | ((u64)vmcs_readl(field+1) << 32);
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#endif
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}
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static noinline void vmwrite_error(unsigned long field, unsigned long value)
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{
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printk(KERN_ERR "vmwrite error: reg %lx value %lx (err %d)\n",
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field, value, vmcs_read32(VM_INSTRUCTION_ERROR));
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dump_stack();
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}
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static void vmcs_writel(unsigned long field, unsigned long value)
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{
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u8 error;
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asm volatile (__ex(ASM_VMX_VMWRITE_RAX_RDX) "; setna %0"
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: "=q"(error) : "a"(value), "d"(field) : "cc");
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if (unlikely(error))
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vmwrite_error(field, value);
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}
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static void vmcs_write16(unsigned long field, u16 value)
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{
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vmcs_writel(field, value);
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}
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static void vmcs_write32(unsigned long field, u32 value)
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{
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vmcs_writel(field, value);
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}
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static void vmcs_write64(unsigned long field, u64 value)
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{
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vmcs_writel(field, value);
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#ifndef CONFIG_X86_64
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asm volatile ("");
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vmcs_writel(field+1, value >> 32);
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#endif
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}
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static void vmcs_clear_bits(unsigned long field, u32 mask)
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{
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vmcs_writel(field, vmcs_readl(field) & ~mask);
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}
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static void vmcs_set_bits(unsigned long field, u32 mask)
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{
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vmcs_writel(field, vmcs_readl(field) | mask);
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}
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static void update_exception_bitmap(struct kvm_vcpu *vcpu)
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{
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u32 eb;
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eb = (1u << PF_VECTOR) | (1u << UD_VECTOR);
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if (!vcpu->fpu_active)
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eb |= 1u << NM_VECTOR;
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if (vcpu->guest_debug & KVM_GUESTDBG_ENABLE) {
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if (vcpu->guest_debug &
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(KVM_GUESTDBG_SINGLESTEP | KVM_GUESTDBG_USE_HW_BP))
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eb |= 1u << DB_VECTOR;
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if (vcpu->guest_debug & KVM_GUESTDBG_USE_SW_BP)
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eb |= 1u << BP_VECTOR;
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}
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if (vcpu->arch.rmode.active)
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eb = ~0;
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if (vm_need_ept())
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eb &= ~(1u << PF_VECTOR); /* bypass_guest_pf = 0 */
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vmcs_write32(EXCEPTION_BITMAP, eb);
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}
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static void reload_tss(void)
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{
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/*
|
|
* VT restores TR but not its size. Useless.
|
|
*/
|
|
struct descriptor_table gdt;
|
|
struct desc_struct *descs;
|
|
|
|
kvm_get_gdt(&gdt);
|
|
descs = (void *)gdt.base;
|
|
descs[GDT_ENTRY_TSS].type = 9; /* available TSS */
|
|
load_TR_desc();
|
|
}
|
|
|
|
static void load_transition_efer(struct vcpu_vmx *vmx)
|
|
{
|
|
int efer_offset = vmx->msr_offset_efer;
|
|
u64 host_efer = vmx->host_msrs[efer_offset].data;
|
|
u64 guest_efer = vmx->guest_msrs[efer_offset].data;
|
|
u64 ignore_bits;
|
|
|
|
if (efer_offset < 0)
|
|
return;
|
|
/*
|
|
* NX is emulated; LMA and LME handled by hardware; SCE meaninless
|
|
* outside long mode
|
|
*/
|
|
ignore_bits = EFER_NX | EFER_SCE;
|
|
#ifdef CONFIG_X86_64
|
|
ignore_bits |= EFER_LMA | EFER_LME;
|
|
/* SCE is meaningful only in long mode on Intel */
|
|
if (guest_efer & EFER_LMA)
|
|
ignore_bits &= ~(u64)EFER_SCE;
|
|
#endif
|
|
if ((guest_efer & ~ignore_bits) == (host_efer & ~ignore_bits))
|
|
return;
|
|
|
|
vmx->host_state.guest_efer_loaded = 1;
|
|
guest_efer &= ~ignore_bits;
|
|
guest_efer |= host_efer & ignore_bits;
|
|
wrmsrl(MSR_EFER, guest_efer);
|
|
vmx->vcpu.stat.efer_reload++;
|
|
}
|
|
|
|
static void reload_host_efer(struct vcpu_vmx *vmx)
|
|
{
|
|
if (vmx->host_state.guest_efer_loaded) {
|
|
vmx->host_state.guest_efer_loaded = 0;
|
|
load_msrs(vmx->host_msrs + vmx->msr_offset_efer, 1);
|
|
}
|
|
}
|
|
|
|
static void vmx_save_host_state(struct kvm_vcpu *vcpu)
|
|
{
|
|
struct vcpu_vmx *vmx = to_vmx(vcpu);
|
|
|
|
if (vmx->host_state.loaded)
|
|
return;
|
|
|
|
vmx->host_state.loaded = 1;
|
|
/*
|
|
* Set host fs and gs selectors. Unfortunately, 22.2.3 does not
|
|
* allow segment selectors with cpl > 0 or ti == 1.
|
|
*/
|
|
vmx->host_state.ldt_sel = kvm_read_ldt();
|
|
vmx->host_state.gs_ldt_reload_needed = vmx->host_state.ldt_sel;
|
|
vmx->host_state.fs_sel = kvm_read_fs();
|
|
if (!(vmx->host_state.fs_sel & 7)) {
|
|
vmcs_write16(HOST_FS_SELECTOR, vmx->host_state.fs_sel);
|
|
vmx->host_state.fs_reload_needed = 0;
|
|
} else {
|
|
vmcs_write16(HOST_FS_SELECTOR, 0);
|
|
vmx->host_state.fs_reload_needed = 1;
|
|
}
|
|
vmx->host_state.gs_sel = kvm_read_gs();
|
|
if (!(vmx->host_state.gs_sel & 7))
|
|
vmcs_write16(HOST_GS_SELECTOR, vmx->host_state.gs_sel);
|
|
else {
|
|
vmcs_write16(HOST_GS_SELECTOR, 0);
|
|
vmx->host_state.gs_ldt_reload_needed = 1;
|
|
}
|
|
|
|
#ifdef CONFIG_X86_64
|
|
vmcs_writel(HOST_FS_BASE, read_msr(MSR_FS_BASE));
|
|
vmcs_writel(HOST_GS_BASE, read_msr(MSR_GS_BASE));
|
|
#else
|
|
vmcs_writel(HOST_FS_BASE, segment_base(vmx->host_state.fs_sel));
|
|
vmcs_writel(HOST_GS_BASE, segment_base(vmx->host_state.gs_sel));
|
|
#endif
|
|
|
|
#ifdef CONFIG_X86_64
|
|
if (is_long_mode(&vmx->vcpu))
|
|
save_msrs(vmx->host_msrs +
|
|
vmx->msr_offset_kernel_gs_base, 1);
|
|
|
|
#endif
|
|
load_msrs(vmx->guest_msrs, vmx->save_nmsrs);
|
|
load_transition_efer(vmx);
|
|
}
|
|
|
|
static void __vmx_load_host_state(struct vcpu_vmx *vmx)
|
|
{
|
|
unsigned long flags;
|
|
|
|
if (!vmx->host_state.loaded)
|
|
return;
|
|
|
|
++vmx->vcpu.stat.host_state_reload;
|
|
vmx->host_state.loaded = 0;
|
|
if (vmx->host_state.fs_reload_needed)
|
|
kvm_load_fs(vmx->host_state.fs_sel);
|
|
if (vmx->host_state.gs_ldt_reload_needed) {
|
|
kvm_load_ldt(vmx->host_state.ldt_sel);
|
|
/*
|
|
* If we have to reload gs, we must take care to
|
|
* preserve our gs base.
|
|
*/
|
|
local_irq_save(flags);
|
|
kvm_load_gs(vmx->host_state.gs_sel);
|
|
#ifdef CONFIG_X86_64
|
|
wrmsrl(MSR_GS_BASE, vmcs_readl(HOST_GS_BASE));
|
|
#endif
|
|
local_irq_restore(flags);
|
|
}
|
|
reload_tss();
|
|
save_msrs(vmx->guest_msrs, vmx->save_nmsrs);
|
|
load_msrs(vmx->host_msrs, vmx->save_nmsrs);
|
|
reload_host_efer(vmx);
|
|
}
|
|
|
|
static void vmx_load_host_state(struct vcpu_vmx *vmx)
|
|
{
|
|
preempt_disable();
|
|
__vmx_load_host_state(vmx);
|
|
preempt_enable();
|
|
}
|
|
|
|
/*
|
|
* Switches to specified vcpu, until a matching vcpu_put(), but assumes
|
|
* vcpu mutex is already taken.
|
|
*/
|
|
static void vmx_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
|
|
{
|
|
struct vcpu_vmx *vmx = to_vmx(vcpu);
|
|
u64 phys_addr = __pa(vmx->vmcs);
|
|
u64 tsc_this, delta, new_offset;
|
|
|
|
if (vcpu->cpu != cpu) {
|
|
vcpu_clear(vmx);
|
|
kvm_migrate_timers(vcpu);
|
|
vpid_sync_vcpu_all(vmx);
|
|
local_irq_disable();
|
|
list_add(&vmx->local_vcpus_link,
|
|
&per_cpu(vcpus_on_cpu, cpu));
|
|
local_irq_enable();
|
|
}
|
|
|
|
if (per_cpu(current_vmcs, cpu) != vmx->vmcs) {
|
|
u8 error;
|
|
|
|
per_cpu(current_vmcs, cpu) = vmx->vmcs;
|
|
asm volatile (__ex(ASM_VMX_VMPTRLD_RAX) "; setna %0"
|
|
: "=g"(error) : "a"(&phys_addr), "m"(phys_addr)
|
|
: "cc");
|
|
if (error)
|
|
printk(KERN_ERR "kvm: vmptrld %p/%llx fail\n",
|
|
vmx->vmcs, phys_addr);
|
|
}
|
|
|
|
if (vcpu->cpu != cpu) {
|
|
struct descriptor_table dt;
|
|
unsigned long sysenter_esp;
|
|
|
|
vcpu->cpu = cpu;
|
|
/*
|
|
* Linux uses per-cpu TSS and GDT, so set these when switching
|
|
* processors.
|
|
*/
|
|
vmcs_writel(HOST_TR_BASE, kvm_read_tr_base()); /* 22.2.4 */
|
|
kvm_get_gdt(&dt);
|
|
vmcs_writel(HOST_GDTR_BASE, dt.base); /* 22.2.4 */
|
|
|
|
rdmsrl(MSR_IA32_SYSENTER_ESP, sysenter_esp);
|
|
vmcs_writel(HOST_IA32_SYSENTER_ESP, sysenter_esp); /* 22.2.3 */
|
|
|
|
/*
|
|
* Make sure the time stamp counter is monotonous.
|
|
*/
|
|
rdtscll(tsc_this);
|
|
if (tsc_this < vcpu->arch.host_tsc) {
|
|
delta = vcpu->arch.host_tsc - tsc_this;
|
|
new_offset = vmcs_read64(TSC_OFFSET) + delta;
|
|
vmcs_write64(TSC_OFFSET, new_offset);
|
|
}
|
|
}
|
|
}
|
|
|
|
static void vmx_vcpu_put(struct kvm_vcpu *vcpu)
|
|
{
|
|
__vmx_load_host_state(to_vmx(vcpu));
|
|
}
|
|
|
|
static void vmx_fpu_activate(struct kvm_vcpu *vcpu)
|
|
{
|
|
if (vcpu->fpu_active)
|
|
return;
|
|
vcpu->fpu_active = 1;
|
|
vmcs_clear_bits(GUEST_CR0, X86_CR0_TS);
|
|
if (vcpu->arch.cr0 & X86_CR0_TS)
|
|
vmcs_set_bits(GUEST_CR0, X86_CR0_TS);
|
|
update_exception_bitmap(vcpu);
|
|
}
|
|
|
|
static void vmx_fpu_deactivate(struct kvm_vcpu *vcpu)
|
|
{
|
|
if (!vcpu->fpu_active)
|
|
return;
|
|
vcpu->fpu_active = 0;
|
|
vmcs_set_bits(GUEST_CR0, X86_CR0_TS);
|
|
update_exception_bitmap(vcpu);
|
|
}
|
|
|
|
static unsigned long vmx_get_rflags(struct kvm_vcpu *vcpu)
|
|
{
|
|
return vmcs_readl(GUEST_RFLAGS);
|
|
}
|
|
|
|
static void vmx_set_rflags(struct kvm_vcpu *vcpu, unsigned long rflags)
|
|
{
|
|
if (vcpu->arch.rmode.active)
|
|
rflags |= X86_EFLAGS_IOPL | X86_EFLAGS_VM;
|
|
vmcs_writel(GUEST_RFLAGS, rflags);
|
|
}
|
|
|
|
static void skip_emulated_instruction(struct kvm_vcpu *vcpu)
|
|
{
|
|
unsigned long rip;
|
|
u32 interruptibility;
|
|
|
|
rip = kvm_rip_read(vcpu);
|
|
rip += vmcs_read32(VM_EXIT_INSTRUCTION_LEN);
|
|
kvm_rip_write(vcpu, rip);
|
|
|
|
/*
|
|
* We emulated an instruction, so temporary interrupt blocking
|
|
* should be removed, if set.
|
|
*/
|
|
interruptibility = vmcs_read32(GUEST_INTERRUPTIBILITY_INFO);
|
|
if (interruptibility & 3)
|
|
vmcs_write32(GUEST_INTERRUPTIBILITY_INFO,
|
|
interruptibility & ~3);
|
|
vcpu->arch.interrupt_window_open = 1;
|
|
}
|
|
|
|
static void vmx_queue_exception(struct kvm_vcpu *vcpu, unsigned nr,
|
|
bool has_error_code, u32 error_code)
|
|
{
|
|
struct vcpu_vmx *vmx = to_vmx(vcpu);
|
|
u32 intr_info = nr | INTR_INFO_VALID_MASK;
|
|
|
|
if (has_error_code) {
|
|
vmcs_write32(VM_ENTRY_EXCEPTION_ERROR_CODE, error_code);
|
|
intr_info |= INTR_INFO_DELIVER_CODE_MASK;
|
|
}
|
|
|
|
if (vcpu->arch.rmode.active) {
|
|
vmx->rmode.irq.pending = true;
|
|
vmx->rmode.irq.vector = nr;
|
|
vmx->rmode.irq.rip = kvm_rip_read(vcpu);
|
|
if (nr == BP_VECTOR || nr == OF_VECTOR)
|
|
vmx->rmode.irq.rip++;
|
|
intr_info |= INTR_TYPE_SOFT_INTR;
|
|
vmcs_write32(VM_ENTRY_INTR_INFO_FIELD, intr_info);
|
|
vmcs_write32(VM_ENTRY_INSTRUCTION_LEN, 1);
|
|
kvm_rip_write(vcpu, vmx->rmode.irq.rip - 1);
|
|
return;
|
|
}
|
|
|
|
if (nr == BP_VECTOR || nr == OF_VECTOR) {
|
|
vmcs_write32(VM_ENTRY_INSTRUCTION_LEN, 1);
|
|
intr_info |= INTR_TYPE_SOFT_EXCEPTION;
|
|
} else
|
|
intr_info |= INTR_TYPE_HARD_EXCEPTION;
|
|
|
|
vmcs_write32(VM_ENTRY_INTR_INFO_FIELD, intr_info);
|
|
}
|
|
|
|
static bool vmx_exception_injected(struct kvm_vcpu *vcpu)
|
|
{
|
|
return false;
|
|
}
|
|
|
|
/*
|
|
* Swap MSR entry in host/guest MSR entry array.
|
|
*/
|
|
#ifdef CONFIG_X86_64
|
|
static void move_msr_up(struct vcpu_vmx *vmx, int from, int to)
|
|
{
|
|
struct kvm_msr_entry tmp;
|
|
|
|
tmp = vmx->guest_msrs[to];
|
|
vmx->guest_msrs[to] = vmx->guest_msrs[from];
|
|
vmx->guest_msrs[from] = tmp;
|
|
tmp = vmx->host_msrs[to];
|
|
vmx->host_msrs[to] = vmx->host_msrs[from];
|
|
vmx->host_msrs[from] = tmp;
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* Set up the vmcs to automatically save and restore system
|
|
* msrs. Don't touch the 64-bit msrs if the guest is in legacy
|
|
* mode, as fiddling with msrs is very expensive.
|
|
*/
|
|
static void setup_msrs(struct vcpu_vmx *vmx)
|
|
{
|
|
int save_nmsrs;
|
|
|
|
vmx_load_host_state(vmx);
|
|
save_nmsrs = 0;
|
|
#ifdef CONFIG_X86_64
|
|
if (is_long_mode(&vmx->vcpu)) {
|
|
int index;
|
|
|
|
index = __find_msr_index(vmx, MSR_SYSCALL_MASK);
|
|
if (index >= 0)
|
|
move_msr_up(vmx, index, save_nmsrs++);
|
|
index = __find_msr_index(vmx, MSR_LSTAR);
|
|
if (index >= 0)
|
|
move_msr_up(vmx, index, save_nmsrs++);
|
|
index = __find_msr_index(vmx, MSR_CSTAR);
|
|
if (index >= 0)
|
|
move_msr_up(vmx, index, save_nmsrs++);
|
|
index = __find_msr_index(vmx, MSR_KERNEL_GS_BASE);
|
|
if (index >= 0)
|
|
move_msr_up(vmx, index, save_nmsrs++);
|
|
/*
|
|
* MSR_K6_STAR is only needed on long mode guests, and only
|
|
* if efer.sce is enabled.
|
|
*/
|
|
index = __find_msr_index(vmx, MSR_K6_STAR);
|
|
if ((index >= 0) && (vmx->vcpu.arch.shadow_efer & EFER_SCE))
|
|
move_msr_up(vmx, index, save_nmsrs++);
|
|
}
|
|
#endif
|
|
vmx->save_nmsrs = save_nmsrs;
|
|
|
|
#ifdef CONFIG_X86_64
|
|
vmx->msr_offset_kernel_gs_base =
|
|
__find_msr_index(vmx, MSR_KERNEL_GS_BASE);
|
|
#endif
|
|
vmx->msr_offset_efer = __find_msr_index(vmx, MSR_EFER);
|
|
}
|
|
|
|
/*
|
|
* reads and returns guest's timestamp counter "register"
|
|
* guest_tsc = host_tsc + tsc_offset -- 21.3
|
|
*/
|
|
static u64 guest_read_tsc(void)
|
|
{
|
|
u64 host_tsc, tsc_offset;
|
|
|
|
rdtscll(host_tsc);
|
|
tsc_offset = vmcs_read64(TSC_OFFSET);
|
|
return host_tsc + tsc_offset;
|
|
}
|
|
|
|
/*
|
|
* writes 'guest_tsc' into guest's timestamp counter "register"
|
|
* guest_tsc = host_tsc + tsc_offset ==> tsc_offset = guest_tsc - host_tsc
|
|
*/
|
|
static void guest_write_tsc(u64 guest_tsc, u64 host_tsc)
|
|
{
|
|
vmcs_write64(TSC_OFFSET, guest_tsc - host_tsc);
|
|
}
|
|
|
|
/*
|
|
* Reads an msr value (of 'msr_index') into 'pdata'.
|
|
* Returns 0 on success, non-0 otherwise.
|
|
* Assumes vcpu_load() was already called.
|
|
*/
|
|
static int vmx_get_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata)
|
|
{
|
|
u64 data;
|
|
struct kvm_msr_entry *msr;
|
|
|
|
if (!pdata) {
|
|
printk(KERN_ERR "BUG: get_msr called with NULL pdata\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
switch (msr_index) {
|
|
#ifdef CONFIG_X86_64
|
|
case MSR_FS_BASE:
|
|
data = vmcs_readl(GUEST_FS_BASE);
|
|
break;
|
|
case MSR_GS_BASE:
|
|
data = vmcs_readl(GUEST_GS_BASE);
|
|
break;
|
|
case MSR_EFER:
|
|
return kvm_get_msr_common(vcpu, msr_index, pdata);
|
|
#endif
|
|
case MSR_IA32_TIME_STAMP_COUNTER:
|
|
data = guest_read_tsc();
|
|
break;
|
|
case MSR_IA32_SYSENTER_CS:
|
|
data = vmcs_read32(GUEST_SYSENTER_CS);
|
|
break;
|
|
case MSR_IA32_SYSENTER_EIP:
|
|
data = vmcs_readl(GUEST_SYSENTER_EIP);
|
|
break;
|
|
case MSR_IA32_SYSENTER_ESP:
|
|
data = vmcs_readl(GUEST_SYSENTER_ESP);
|
|
break;
|
|
default:
|
|
vmx_load_host_state(to_vmx(vcpu));
|
|
msr = find_msr_entry(to_vmx(vcpu), msr_index);
|
|
if (msr) {
|
|
data = msr->data;
|
|
break;
|
|
}
|
|
return kvm_get_msr_common(vcpu, msr_index, pdata);
|
|
}
|
|
|
|
*pdata = data;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Writes msr value into into the appropriate "register".
|
|
* Returns 0 on success, non-0 otherwise.
|
|
* Assumes vcpu_load() was already called.
|
|
*/
|
|
static int vmx_set_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 data)
|
|
{
|
|
struct vcpu_vmx *vmx = to_vmx(vcpu);
|
|
struct kvm_msr_entry *msr;
|
|
u64 host_tsc;
|
|
int ret = 0;
|
|
|
|
switch (msr_index) {
|
|
case MSR_EFER:
|
|
vmx_load_host_state(vmx);
|
|
ret = kvm_set_msr_common(vcpu, msr_index, data);
|
|
break;
|
|
#ifdef CONFIG_X86_64
|
|
case MSR_FS_BASE:
|
|
vmcs_writel(GUEST_FS_BASE, data);
|
|
break;
|
|
case MSR_GS_BASE:
|
|
vmcs_writel(GUEST_GS_BASE, data);
|
|
break;
|
|
#endif
|
|
case MSR_IA32_SYSENTER_CS:
|
|
vmcs_write32(GUEST_SYSENTER_CS, data);
|
|
break;
|
|
case MSR_IA32_SYSENTER_EIP:
|
|
vmcs_writel(GUEST_SYSENTER_EIP, data);
|
|
break;
|
|
case MSR_IA32_SYSENTER_ESP:
|
|
vmcs_writel(GUEST_SYSENTER_ESP, data);
|
|
break;
|
|
case MSR_IA32_TIME_STAMP_COUNTER:
|
|
rdtscll(host_tsc);
|
|
guest_write_tsc(data, host_tsc);
|
|
break;
|
|
case MSR_P6_PERFCTR0:
|
|
case MSR_P6_PERFCTR1:
|
|
case MSR_P6_EVNTSEL0:
|
|
case MSR_P6_EVNTSEL1:
|
|
/*
|
|
* Just discard all writes to the performance counters; this
|
|
* should keep both older linux and windows 64-bit guests
|
|
* happy
|
|
*/
|
|
pr_unimpl(vcpu, "unimplemented perfctr wrmsr: 0x%x data 0x%llx\n", msr_index, data);
|
|
|
|
break;
|
|
case MSR_IA32_CR_PAT:
|
|
if (vmcs_config.vmentry_ctrl & VM_ENTRY_LOAD_IA32_PAT) {
|
|
vmcs_write64(GUEST_IA32_PAT, data);
|
|
vcpu->arch.pat = data;
|
|
break;
|
|
}
|
|
/* Otherwise falls through to kvm_set_msr_common */
|
|
default:
|
|
vmx_load_host_state(vmx);
|
|
msr = find_msr_entry(vmx, msr_index);
|
|
if (msr) {
|
|
msr->data = data;
|
|
break;
|
|
}
|
|
ret = kvm_set_msr_common(vcpu, msr_index, data);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void vmx_cache_reg(struct kvm_vcpu *vcpu, enum kvm_reg reg)
|
|
{
|
|
__set_bit(reg, (unsigned long *)&vcpu->arch.regs_avail);
|
|
switch (reg) {
|
|
case VCPU_REGS_RSP:
|
|
vcpu->arch.regs[VCPU_REGS_RSP] = vmcs_readl(GUEST_RSP);
|
|
break;
|
|
case VCPU_REGS_RIP:
|
|
vcpu->arch.regs[VCPU_REGS_RIP] = vmcs_readl(GUEST_RIP);
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
|
|
static int set_guest_debug(struct kvm_vcpu *vcpu, struct kvm_guest_debug *dbg)
|
|
{
|
|
int old_debug = vcpu->guest_debug;
|
|
unsigned long flags;
|
|
|
|
vcpu->guest_debug = dbg->control;
|
|
if (!(vcpu->guest_debug & KVM_GUESTDBG_ENABLE))
|
|
vcpu->guest_debug = 0;
|
|
|
|
if (vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP)
|
|
vmcs_writel(GUEST_DR7, dbg->arch.debugreg[7]);
|
|
else
|
|
vmcs_writel(GUEST_DR7, vcpu->arch.dr7);
|
|
|
|
flags = vmcs_readl(GUEST_RFLAGS);
|
|
if (vcpu->guest_debug & KVM_GUESTDBG_SINGLESTEP)
|
|
flags |= X86_EFLAGS_TF | X86_EFLAGS_RF;
|
|
else if (old_debug & KVM_GUESTDBG_SINGLESTEP)
|
|
flags &= ~(X86_EFLAGS_TF | X86_EFLAGS_RF);
|
|
vmcs_writel(GUEST_RFLAGS, flags);
|
|
|
|
update_exception_bitmap(vcpu);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int vmx_get_irq(struct kvm_vcpu *vcpu)
|
|
{
|
|
if (!vcpu->arch.interrupt.pending)
|
|
return -1;
|
|
return vcpu->arch.interrupt.nr;
|
|
}
|
|
|
|
static __init int cpu_has_kvm_support(void)
|
|
{
|
|
return cpu_has_vmx();
|
|
}
|
|
|
|
static __init int vmx_disabled_by_bios(void)
|
|
{
|
|
u64 msr;
|
|
|
|
rdmsrl(MSR_IA32_FEATURE_CONTROL, msr);
|
|
return (msr & (FEATURE_CONTROL_LOCKED |
|
|
FEATURE_CONTROL_VMXON_ENABLED))
|
|
== FEATURE_CONTROL_LOCKED;
|
|
/* locked but not enabled */
|
|
}
|
|
|
|
static void hardware_enable(void *garbage)
|
|
{
|
|
int cpu = raw_smp_processor_id();
|
|
u64 phys_addr = __pa(per_cpu(vmxarea, cpu));
|
|
u64 old;
|
|
|
|
INIT_LIST_HEAD(&per_cpu(vcpus_on_cpu, cpu));
|
|
rdmsrl(MSR_IA32_FEATURE_CONTROL, old);
|
|
if ((old & (FEATURE_CONTROL_LOCKED |
|
|
FEATURE_CONTROL_VMXON_ENABLED))
|
|
!= (FEATURE_CONTROL_LOCKED |
|
|
FEATURE_CONTROL_VMXON_ENABLED))
|
|
/* enable and lock */
|
|
wrmsrl(MSR_IA32_FEATURE_CONTROL, old |
|
|
FEATURE_CONTROL_LOCKED |
|
|
FEATURE_CONTROL_VMXON_ENABLED);
|
|
write_cr4(read_cr4() | X86_CR4_VMXE); /* FIXME: not cpu hotplug safe */
|
|
asm volatile (ASM_VMX_VMXON_RAX
|
|
: : "a"(&phys_addr), "m"(phys_addr)
|
|
: "memory", "cc");
|
|
}
|
|
|
|
static void vmclear_local_vcpus(void)
|
|
{
|
|
int cpu = raw_smp_processor_id();
|
|
struct vcpu_vmx *vmx, *n;
|
|
|
|
list_for_each_entry_safe(vmx, n, &per_cpu(vcpus_on_cpu, cpu),
|
|
local_vcpus_link)
|
|
__vcpu_clear(vmx);
|
|
}
|
|
|
|
|
|
/* Just like cpu_vmxoff(), but with the __kvm_handle_fault_on_reboot()
|
|
* tricks.
|
|
*/
|
|
static void kvm_cpu_vmxoff(void)
|
|
{
|
|
asm volatile (__ex(ASM_VMX_VMXOFF) : : : "cc");
|
|
write_cr4(read_cr4() & ~X86_CR4_VMXE);
|
|
}
|
|
|
|
static void hardware_disable(void *garbage)
|
|
{
|
|
vmclear_local_vcpus();
|
|
kvm_cpu_vmxoff();
|
|
}
|
|
|
|
static __init int adjust_vmx_controls(u32 ctl_min, u32 ctl_opt,
|
|
u32 msr, u32 *result)
|
|
{
|
|
u32 vmx_msr_low, vmx_msr_high;
|
|
u32 ctl = ctl_min | ctl_opt;
|
|
|
|
rdmsr(msr, vmx_msr_low, vmx_msr_high);
|
|
|
|
ctl &= vmx_msr_high; /* bit == 0 in high word ==> must be zero */
|
|
ctl |= vmx_msr_low; /* bit == 1 in low word ==> must be one */
|
|
|
|
/* Ensure minimum (required) set of control bits are supported. */
|
|
if (ctl_min & ~ctl)
|
|
return -EIO;
|
|
|
|
*result = ctl;
|
|
return 0;
|
|
}
|
|
|
|
static __init int setup_vmcs_config(struct vmcs_config *vmcs_conf)
|
|
{
|
|
u32 vmx_msr_low, vmx_msr_high;
|
|
u32 min, opt, min2, opt2;
|
|
u32 _pin_based_exec_control = 0;
|
|
u32 _cpu_based_exec_control = 0;
|
|
u32 _cpu_based_2nd_exec_control = 0;
|
|
u32 _vmexit_control = 0;
|
|
u32 _vmentry_control = 0;
|
|
|
|
min = PIN_BASED_EXT_INTR_MASK | PIN_BASED_NMI_EXITING;
|
|
opt = PIN_BASED_VIRTUAL_NMIS;
|
|
if (adjust_vmx_controls(min, opt, MSR_IA32_VMX_PINBASED_CTLS,
|
|
&_pin_based_exec_control) < 0)
|
|
return -EIO;
|
|
|
|
min = CPU_BASED_HLT_EXITING |
|
|
#ifdef CONFIG_X86_64
|
|
CPU_BASED_CR8_LOAD_EXITING |
|
|
CPU_BASED_CR8_STORE_EXITING |
|
|
#endif
|
|
CPU_BASED_CR3_LOAD_EXITING |
|
|
CPU_BASED_CR3_STORE_EXITING |
|
|
CPU_BASED_USE_IO_BITMAPS |
|
|
CPU_BASED_MOV_DR_EXITING |
|
|
CPU_BASED_USE_TSC_OFFSETING |
|
|
CPU_BASED_INVLPG_EXITING;
|
|
opt = CPU_BASED_TPR_SHADOW |
|
|
CPU_BASED_USE_MSR_BITMAPS |
|
|
CPU_BASED_ACTIVATE_SECONDARY_CONTROLS;
|
|
if (adjust_vmx_controls(min, opt, MSR_IA32_VMX_PROCBASED_CTLS,
|
|
&_cpu_based_exec_control) < 0)
|
|
return -EIO;
|
|
#ifdef CONFIG_X86_64
|
|
if ((_cpu_based_exec_control & CPU_BASED_TPR_SHADOW))
|
|
_cpu_based_exec_control &= ~CPU_BASED_CR8_LOAD_EXITING &
|
|
~CPU_BASED_CR8_STORE_EXITING;
|
|
#endif
|
|
if (_cpu_based_exec_control & CPU_BASED_ACTIVATE_SECONDARY_CONTROLS) {
|
|
min2 = 0;
|
|
opt2 = SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES |
|
|
SECONDARY_EXEC_WBINVD_EXITING |
|
|
SECONDARY_EXEC_ENABLE_VPID |
|
|
SECONDARY_EXEC_ENABLE_EPT;
|
|
if (adjust_vmx_controls(min2, opt2,
|
|
MSR_IA32_VMX_PROCBASED_CTLS2,
|
|
&_cpu_based_2nd_exec_control) < 0)
|
|
return -EIO;
|
|
}
|
|
#ifndef CONFIG_X86_64
|
|
if (!(_cpu_based_2nd_exec_control &
|
|
SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES))
|
|
_cpu_based_exec_control &= ~CPU_BASED_TPR_SHADOW;
|
|
#endif
|
|
if (_cpu_based_2nd_exec_control & SECONDARY_EXEC_ENABLE_EPT) {
|
|
/* CR3 accesses and invlpg don't need to cause VM Exits when EPT
|
|
enabled */
|
|
min &= ~(CPU_BASED_CR3_LOAD_EXITING |
|
|
CPU_BASED_CR3_STORE_EXITING |
|
|
CPU_BASED_INVLPG_EXITING);
|
|
if (adjust_vmx_controls(min, opt, MSR_IA32_VMX_PROCBASED_CTLS,
|
|
&_cpu_based_exec_control) < 0)
|
|
return -EIO;
|
|
rdmsr(MSR_IA32_VMX_EPT_VPID_CAP,
|
|
vmx_capability.ept, vmx_capability.vpid);
|
|
}
|
|
|
|
min = 0;
|
|
#ifdef CONFIG_X86_64
|
|
min |= VM_EXIT_HOST_ADDR_SPACE_SIZE;
|
|
#endif
|
|
opt = VM_EXIT_SAVE_IA32_PAT | VM_EXIT_LOAD_IA32_PAT;
|
|
if (adjust_vmx_controls(min, opt, MSR_IA32_VMX_EXIT_CTLS,
|
|
&_vmexit_control) < 0)
|
|
return -EIO;
|
|
|
|
min = 0;
|
|
opt = VM_ENTRY_LOAD_IA32_PAT;
|
|
if (adjust_vmx_controls(min, opt, MSR_IA32_VMX_ENTRY_CTLS,
|
|
&_vmentry_control) < 0)
|
|
return -EIO;
|
|
|
|
rdmsr(MSR_IA32_VMX_BASIC, vmx_msr_low, vmx_msr_high);
|
|
|
|
/* IA-32 SDM Vol 3B: VMCS size is never greater than 4kB. */
|
|
if ((vmx_msr_high & 0x1fff) > PAGE_SIZE)
|
|
return -EIO;
|
|
|
|
#ifdef CONFIG_X86_64
|
|
/* IA-32 SDM Vol 3B: 64-bit CPUs always have VMX_BASIC_MSR[48]==0. */
|
|
if (vmx_msr_high & (1u<<16))
|
|
return -EIO;
|
|
#endif
|
|
|
|
/* Require Write-Back (WB) memory type for VMCS accesses. */
|
|
if (((vmx_msr_high >> 18) & 15) != 6)
|
|
return -EIO;
|
|
|
|
vmcs_conf->size = vmx_msr_high & 0x1fff;
|
|
vmcs_conf->order = get_order(vmcs_config.size);
|
|
vmcs_conf->revision_id = vmx_msr_low;
|
|
|
|
vmcs_conf->pin_based_exec_ctrl = _pin_based_exec_control;
|
|
vmcs_conf->cpu_based_exec_ctrl = _cpu_based_exec_control;
|
|
vmcs_conf->cpu_based_2nd_exec_ctrl = _cpu_based_2nd_exec_control;
|
|
vmcs_conf->vmexit_ctrl = _vmexit_control;
|
|
vmcs_conf->vmentry_ctrl = _vmentry_control;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct vmcs *alloc_vmcs_cpu(int cpu)
|
|
{
|
|
int node = cpu_to_node(cpu);
|
|
struct page *pages;
|
|
struct vmcs *vmcs;
|
|
|
|
pages = alloc_pages_node(node, GFP_KERNEL, vmcs_config.order);
|
|
if (!pages)
|
|
return NULL;
|
|
vmcs = page_address(pages);
|
|
memset(vmcs, 0, vmcs_config.size);
|
|
vmcs->revision_id = vmcs_config.revision_id; /* vmcs revision id */
|
|
return vmcs;
|
|
}
|
|
|
|
static struct vmcs *alloc_vmcs(void)
|
|
{
|
|
return alloc_vmcs_cpu(raw_smp_processor_id());
|
|
}
|
|
|
|
static void free_vmcs(struct vmcs *vmcs)
|
|
{
|
|
free_pages((unsigned long)vmcs, vmcs_config.order);
|
|
}
|
|
|
|
static void free_kvm_area(void)
|
|
{
|
|
int cpu;
|
|
|
|
for_each_online_cpu(cpu)
|
|
free_vmcs(per_cpu(vmxarea, cpu));
|
|
}
|
|
|
|
static __init int alloc_kvm_area(void)
|
|
{
|
|
int cpu;
|
|
|
|
for_each_online_cpu(cpu) {
|
|
struct vmcs *vmcs;
|
|
|
|
vmcs = alloc_vmcs_cpu(cpu);
|
|
if (!vmcs) {
|
|
free_kvm_area();
|
|
return -ENOMEM;
|
|
}
|
|
|
|
per_cpu(vmxarea, cpu) = vmcs;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static __init int hardware_setup(void)
|
|
{
|
|
if (setup_vmcs_config(&vmcs_config) < 0)
|
|
return -EIO;
|
|
|
|
if (boot_cpu_has(X86_FEATURE_NX))
|
|
kvm_enable_efer_bits(EFER_NX);
|
|
|
|
return alloc_kvm_area();
|
|
}
|
|
|
|
static __exit void hardware_unsetup(void)
|
|
{
|
|
free_kvm_area();
|
|
}
|
|
|
|
static void fix_pmode_dataseg(int seg, struct kvm_save_segment *save)
|
|
{
|
|
struct kvm_vmx_segment_field *sf = &kvm_vmx_segment_fields[seg];
|
|
|
|
if (vmcs_readl(sf->base) == save->base && (save->base & AR_S_MASK)) {
|
|
vmcs_write16(sf->selector, save->selector);
|
|
vmcs_writel(sf->base, save->base);
|
|
vmcs_write32(sf->limit, save->limit);
|
|
vmcs_write32(sf->ar_bytes, save->ar);
|
|
} else {
|
|
u32 dpl = (vmcs_read16(sf->selector) & SELECTOR_RPL_MASK)
|
|
<< AR_DPL_SHIFT;
|
|
vmcs_write32(sf->ar_bytes, 0x93 | dpl);
|
|
}
|
|
}
|
|
|
|
static void enter_pmode(struct kvm_vcpu *vcpu)
|
|
{
|
|
unsigned long flags;
|
|
struct vcpu_vmx *vmx = to_vmx(vcpu);
|
|
|
|
vmx->emulation_required = 1;
|
|
vcpu->arch.rmode.active = 0;
|
|
|
|
vmcs_writel(GUEST_TR_BASE, vcpu->arch.rmode.tr.base);
|
|
vmcs_write32(GUEST_TR_LIMIT, vcpu->arch.rmode.tr.limit);
|
|
vmcs_write32(GUEST_TR_AR_BYTES, vcpu->arch.rmode.tr.ar);
|
|
|
|
flags = vmcs_readl(GUEST_RFLAGS);
|
|
flags &= ~(X86_EFLAGS_IOPL | X86_EFLAGS_VM);
|
|
flags |= (vcpu->arch.rmode.save_iopl << IOPL_SHIFT);
|
|
vmcs_writel(GUEST_RFLAGS, flags);
|
|
|
|
vmcs_writel(GUEST_CR4, (vmcs_readl(GUEST_CR4) & ~X86_CR4_VME) |
|
|
(vmcs_readl(CR4_READ_SHADOW) & X86_CR4_VME));
|
|
|
|
update_exception_bitmap(vcpu);
|
|
|
|
if (emulate_invalid_guest_state)
|
|
return;
|
|
|
|
fix_pmode_dataseg(VCPU_SREG_ES, &vcpu->arch.rmode.es);
|
|
fix_pmode_dataseg(VCPU_SREG_DS, &vcpu->arch.rmode.ds);
|
|
fix_pmode_dataseg(VCPU_SREG_GS, &vcpu->arch.rmode.gs);
|
|
fix_pmode_dataseg(VCPU_SREG_FS, &vcpu->arch.rmode.fs);
|
|
|
|
vmcs_write16(GUEST_SS_SELECTOR, 0);
|
|
vmcs_write32(GUEST_SS_AR_BYTES, 0x93);
|
|
|
|
vmcs_write16(GUEST_CS_SELECTOR,
|
|
vmcs_read16(GUEST_CS_SELECTOR) & ~SELECTOR_RPL_MASK);
|
|
vmcs_write32(GUEST_CS_AR_BYTES, 0x9b);
|
|
}
|
|
|
|
static gva_t rmode_tss_base(struct kvm *kvm)
|
|
{
|
|
if (!kvm->arch.tss_addr) {
|
|
gfn_t base_gfn = kvm->memslots[0].base_gfn +
|
|
kvm->memslots[0].npages - 3;
|
|
return base_gfn << PAGE_SHIFT;
|
|
}
|
|
return kvm->arch.tss_addr;
|
|
}
|
|
|
|
static void fix_rmode_seg(int seg, struct kvm_save_segment *save)
|
|
{
|
|
struct kvm_vmx_segment_field *sf = &kvm_vmx_segment_fields[seg];
|
|
|
|
save->selector = vmcs_read16(sf->selector);
|
|
save->base = vmcs_readl(sf->base);
|
|
save->limit = vmcs_read32(sf->limit);
|
|
save->ar = vmcs_read32(sf->ar_bytes);
|
|
vmcs_write16(sf->selector, save->base >> 4);
|
|
vmcs_write32(sf->base, save->base & 0xfffff);
|
|
vmcs_write32(sf->limit, 0xffff);
|
|
vmcs_write32(sf->ar_bytes, 0xf3);
|
|
}
|
|
|
|
static void enter_rmode(struct kvm_vcpu *vcpu)
|
|
{
|
|
unsigned long flags;
|
|
struct vcpu_vmx *vmx = to_vmx(vcpu);
|
|
|
|
vmx->emulation_required = 1;
|
|
vcpu->arch.rmode.active = 1;
|
|
|
|
vcpu->arch.rmode.tr.base = vmcs_readl(GUEST_TR_BASE);
|
|
vmcs_writel(GUEST_TR_BASE, rmode_tss_base(vcpu->kvm));
|
|
|
|
vcpu->arch.rmode.tr.limit = vmcs_read32(GUEST_TR_LIMIT);
|
|
vmcs_write32(GUEST_TR_LIMIT, RMODE_TSS_SIZE - 1);
|
|
|
|
vcpu->arch.rmode.tr.ar = vmcs_read32(GUEST_TR_AR_BYTES);
|
|
vmcs_write32(GUEST_TR_AR_BYTES, 0x008b);
|
|
|
|
flags = vmcs_readl(GUEST_RFLAGS);
|
|
vcpu->arch.rmode.save_iopl
|
|
= (flags & X86_EFLAGS_IOPL) >> IOPL_SHIFT;
|
|
|
|
flags |= X86_EFLAGS_IOPL | X86_EFLAGS_VM;
|
|
|
|
vmcs_writel(GUEST_RFLAGS, flags);
|
|
vmcs_writel(GUEST_CR4, vmcs_readl(GUEST_CR4) | X86_CR4_VME);
|
|
update_exception_bitmap(vcpu);
|
|
|
|
if (emulate_invalid_guest_state)
|
|
goto continue_rmode;
|
|
|
|
vmcs_write16(GUEST_SS_SELECTOR, vmcs_readl(GUEST_SS_BASE) >> 4);
|
|
vmcs_write32(GUEST_SS_LIMIT, 0xffff);
|
|
vmcs_write32(GUEST_SS_AR_BYTES, 0xf3);
|
|
|
|
vmcs_write32(GUEST_CS_AR_BYTES, 0xf3);
|
|
vmcs_write32(GUEST_CS_LIMIT, 0xffff);
|
|
if (vmcs_readl(GUEST_CS_BASE) == 0xffff0000)
|
|
vmcs_writel(GUEST_CS_BASE, 0xf0000);
|
|
vmcs_write16(GUEST_CS_SELECTOR, vmcs_readl(GUEST_CS_BASE) >> 4);
|
|
|
|
fix_rmode_seg(VCPU_SREG_ES, &vcpu->arch.rmode.es);
|
|
fix_rmode_seg(VCPU_SREG_DS, &vcpu->arch.rmode.ds);
|
|
fix_rmode_seg(VCPU_SREG_GS, &vcpu->arch.rmode.gs);
|
|
fix_rmode_seg(VCPU_SREG_FS, &vcpu->arch.rmode.fs);
|
|
|
|
continue_rmode:
|
|
kvm_mmu_reset_context(vcpu);
|
|
init_rmode(vcpu->kvm);
|
|
}
|
|
|
|
static void vmx_set_efer(struct kvm_vcpu *vcpu, u64 efer)
|
|
{
|
|
struct vcpu_vmx *vmx = to_vmx(vcpu);
|
|
struct kvm_msr_entry *msr = find_msr_entry(vmx, MSR_EFER);
|
|
|
|
vcpu->arch.shadow_efer = efer;
|
|
if (!msr)
|
|
return;
|
|
if (efer & EFER_LMA) {
|
|
vmcs_write32(VM_ENTRY_CONTROLS,
|
|
vmcs_read32(VM_ENTRY_CONTROLS) |
|
|
VM_ENTRY_IA32E_MODE);
|
|
msr->data = efer;
|
|
} else {
|
|
vmcs_write32(VM_ENTRY_CONTROLS,
|
|
vmcs_read32(VM_ENTRY_CONTROLS) &
|
|
~VM_ENTRY_IA32E_MODE);
|
|
|
|
msr->data = efer & ~EFER_LME;
|
|
}
|
|
setup_msrs(vmx);
|
|
}
|
|
|
|
#ifdef CONFIG_X86_64
|
|
|
|
static void enter_lmode(struct kvm_vcpu *vcpu)
|
|
{
|
|
u32 guest_tr_ar;
|
|
|
|
guest_tr_ar = vmcs_read32(GUEST_TR_AR_BYTES);
|
|
if ((guest_tr_ar & AR_TYPE_MASK) != AR_TYPE_BUSY_64_TSS) {
|
|
printk(KERN_DEBUG "%s: tss fixup for long mode. \n",
|
|
__func__);
|
|
vmcs_write32(GUEST_TR_AR_BYTES,
|
|
(guest_tr_ar & ~AR_TYPE_MASK)
|
|
| AR_TYPE_BUSY_64_TSS);
|
|
}
|
|
vcpu->arch.shadow_efer |= EFER_LMA;
|
|
vmx_set_efer(vcpu, vcpu->arch.shadow_efer);
|
|
}
|
|
|
|
static void exit_lmode(struct kvm_vcpu *vcpu)
|
|
{
|
|
vcpu->arch.shadow_efer &= ~EFER_LMA;
|
|
|
|
vmcs_write32(VM_ENTRY_CONTROLS,
|
|
vmcs_read32(VM_ENTRY_CONTROLS)
|
|
& ~VM_ENTRY_IA32E_MODE);
|
|
}
|
|
|
|
#endif
|
|
|
|
static void vmx_flush_tlb(struct kvm_vcpu *vcpu)
|
|
{
|
|
vpid_sync_vcpu_all(to_vmx(vcpu));
|
|
if (vm_need_ept())
|
|
ept_sync_context(construct_eptp(vcpu->arch.mmu.root_hpa));
|
|
}
|
|
|
|
static void vmx_decache_cr4_guest_bits(struct kvm_vcpu *vcpu)
|
|
{
|
|
vcpu->arch.cr4 &= KVM_GUEST_CR4_MASK;
|
|
vcpu->arch.cr4 |= vmcs_readl(GUEST_CR4) & ~KVM_GUEST_CR4_MASK;
|
|
}
|
|
|
|
static void ept_load_pdptrs(struct kvm_vcpu *vcpu)
|
|
{
|
|
if (is_paging(vcpu) && is_pae(vcpu) && !is_long_mode(vcpu)) {
|
|
if (!load_pdptrs(vcpu, vcpu->arch.cr3)) {
|
|
printk(KERN_ERR "EPT: Fail to load pdptrs!\n");
|
|
return;
|
|
}
|
|
vmcs_write64(GUEST_PDPTR0, vcpu->arch.pdptrs[0]);
|
|
vmcs_write64(GUEST_PDPTR1, vcpu->arch.pdptrs[1]);
|
|
vmcs_write64(GUEST_PDPTR2, vcpu->arch.pdptrs[2]);
|
|
vmcs_write64(GUEST_PDPTR3, vcpu->arch.pdptrs[3]);
|
|
}
|
|
}
|
|
|
|
static void vmx_set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4);
|
|
|
|
static void ept_update_paging_mode_cr0(unsigned long *hw_cr0,
|
|
unsigned long cr0,
|
|
struct kvm_vcpu *vcpu)
|
|
{
|
|
if (!(cr0 & X86_CR0_PG)) {
|
|
/* From paging/starting to nonpaging */
|
|
vmcs_write32(CPU_BASED_VM_EXEC_CONTROL,
|
|
vmcs_read32(CPU_BASED_VM_EXEC_CONTROL) |
|
|
(CPU_BASED_CR3_LOAD_EXITING |
|
|
CPU_BASED_CR3_STORE_EXITING));
|
|
vcpu->arch.cr0 = cr0;
|
|
vmx_set_cr4(vcpu, vcpu->arch.cr4);
|
|
*hw_cr0 |= X86_CR0_PE | X86_CR0_PG;
|
|
*hw_cr0 &= ~X86_CR0_WP;
|
|
} else if (!is_paging(vcpu)) {
|
|
/* From nonpaging to paging */
|
|
vmcs_write32(CPU_BASED_VM_EXEC_CONTROL,
|
|
vmcs_read32(CPU_BASED_VM_EXEC_CONTROL) &
|
|
~(CPU_BASED_CR3_LOAD_EXITING |
|
|
CPU_BASED_CR3_STORE_EXITING));
|
|
vcpu->arch.cr0 = cr0;
|
|
vmx_set_cr4(vcpu, vcpu->arch.cr4);
|
|
if (!(vcpu->arch.cr0 & X86_CR0_WP))
|
|
*hw_cr0 &= ~X86_CR0_WP;
|
|
}
|
|
}
|
|
|
|
static void ept_update_paging_mode_cr4(unsigned long *hw_cr4,
|
|
struct kvm_vcpu *vcpu)
|
|
{
|
|
if (!is_paging(vcpu)) {
|
|
*hw_cr4 &= ~X86_CR4_PAE;
|
|
*hw_cr4 |= X86_CR4_PSE;
|
|
} else if (!(vcpu->arch.cr4 & X86_CR4_PAE))
|
|
*hw_cr4 &= ~X86_CR4_PAE;
|
|
}
|
|
|
|
static void vmx_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0)
|
|
{
|
|
unsigned long hw_cr0 = (cr0 & ~KVM_GUEST_CR0_MASK) |
|
|
KVM_VM_CR0_ALWAYS_ON;
|
|
|
|
vmx_fpu_deactivate(vcpu);
|
|
|
|
if (vcpu->arch.rmode.active && (cr0 & X86_CR0_PE))
|
|
enter_pmode(vcpu);
|
|
|
|
if (!vcpu->arch.rmode.active && !(cr0 & X86_CR0_PE))
|
|
enter_rmode(vcpu);
|
|
|
|
#ifdef CONFIG_X86_64
|
|
if (vcpu->arch.shadow_efer & EFER_LME) {
|
|
if (!is_paging(vcpu) && (cr0 & X86_CR0_PG))
|
|
enter_lmode(vcpu);
|
|
if (is_paging(vcpu) && !(cr0 & X86_CR0_PG))
|
|
exit_lmode(vcpu);
|
|
}
|
|
#endif
|
|
|
|
if (vm_need_ept())
|
|
ept_update_paging_mode_cr0(&hw_cr0, cr0, vcpu);
|
|
|
|
vmcs_writel(CR0_READ_SHADOW, cr0);
|
|
vmcs_writel(GUEST_CR0, hw_cr0);
|
|
vcpu->arch.cr0 = cr0;
|
|
|
|
if (!(cr0 & X86_CR0_TS) || !(cr0 & X86_CR0_PE))
|
|
vmx_fpu_activate(vcpu);
|
|
}
|
|
|
|
static u64 construct_eptp(unsigned long root_hpa)
|
|
{
|
|
u64 eptp;
|
|
|
|
/* TODO write the value reading from MSR */
|
|
eptp = VMX_EPT_DEFAULT_MT |
|
|
VMX_EPT_DEFAULT_GAW << VMX_EPT_GAW_EPTP_SHIFT;
|
|
eptp |= (root_hpa & PAGE_MASK);
|
|
|
|
return eptp;
|
|
}
|
|
|
|
static void vmx_set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3)
|
|
{
|
|
unsigned long guest_cr3;
|
|
u64 eptp;
|
|
|
|
guest_cr3 = cr3;
|
|
if (vm_need_ept()) {
|
|
eptp = construct_eptp(cr3);
|
|
vmcs_write64(EPT_POINTER, eptp);
|
|
ept_sync_context(eptp);
|
|
ept_load_pdptrs(vcpu);
|
|
guest_cr3 = is_paging(vcpu) ? vcpu->arch.cr3 :
|
|
VMX_EPT_IDENTITY_PAGETABLE_ADDR;
|
|
}
|
|
|
|
vmx_flush_tlb(vcpu);
|
|
vmcs_writel(GUEST_CR3, guest_cr3);
|
|
if (vcpu->arch.cr0 & X86_CR0_PE)
|
|
vmx_fpu_deactivate(vcpu);
|
|
}
|
|
|
|
static void vmx_set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4)
|
|
{
|
|
unsigned long hw_cr4 = cr4 | (vcpu->arch.rmode.active ?
|
|
KVM_RMODE_VM_CR4_ALWAYS_ON : KVM_PMODE_VM_CR4_ALWAYS_ON);
|
|
|
|
vcpu->arch.cr4 = cr4;
|
|
if (vm_need_ept())
|
|
ept_update_paging_mode_cr4(&hw_cr4, vcpu);
|
|
|
|
vmcs_writel(CR4_READ_SHADOW, cr4);
|
|
vmcs_writel(GUEST_CR4, hw_cr4);
|
|
}
|
|
|
|
static u64 vmx_get_segment_base(struct kvm_vcpu *vcpu, int seg)
|
|
{
|
|
struct kvm_vmx_segment_field *sf = &kvm_vmx_segment_fields[seg];
|
|
|
|
return vmcs_readl(sf->base);
|
|
}
|
|
|
|
static void vmx_get_segment(struct kvm_vcpu *vcpu,
|
|
struct kvm_segment *var, int seg)
|
|
{
|
|
struct kvm_vmx_segment_field *sf = &kvm_vmx_segment_fields[seg];
|
|
u32 ar;
|
|
|
|
var->base = vmcs_readl(sf->base);
|
|
var->limit = vmcs_read32(sf->limit);
|
|
var->selector = vmcs_read16(sf->selector);
|
|
ar = vmcs_read32(sf->ar_bytes);
|
|
if ((ar & AR_UNUSABLE_MASK) && !emulate_invalid_guest_state)
|
|
ar = 0;
|
|
var->type = ar & 15;
|
|
var->s = (ar >> 4) & 1;
|
|
var->dpl = (ar >> 5) & 3;
|
|
var->present = (ar >> 7) & 1;
|
|
var->avl = (ar >> 12) & 1;
|
|
var->l = (ar >> 13) & 1;
|
|
var->db = (ar >> 14) & 1;
|
|
var->g = (ar >> 15) & 1;
|
|
var->unusable = (ar >> 16) & 1;
|
|
}
|
|
|
|
static int vmx_get_cpl(struct kvm_vcpu *vcpu)
|
|
{
|
|
struct kvm_segment kvm_seg;
|
|
|
|
if (!(vcpu->arch.cr0 & X86_CR0_PE)) /* if real mode */
|
|
return 0;
|
|
|
|
if (vmx_get_rflags(vcpu) & X86_EFLAGS_VM) /* if virtual 8086 */
|
|
return 3;
|
|
|
|
vmx_get_segment(vcpu, &kvm_seg, VCPU_SREG_CS);
|
|
return kvm_seg.selector & 3;
|
|
}
|
|
|
|
static u32 vmx_segment_access_rights(struct kvm_segment *var)
|
|
{
|
|
u32 ar;
|
|
|
|
if (var->unusable)
|
|
ar = 1 << 16;
|
|
else {
|
|
ar = var->type & 15;
|
|
ar |= (var->s & 1) << 4;
|
|
ar |= (var->dpl & 3) << 5;
|
|
ar |= (var->present & 1) << 7;
|
|
ar |= (var->avl & 1) << 12;
|
|
ar |= (var->l & 1) << 13;
|
|
ar |= (var->db & 1) << 14;
|
|
ar |= (var->g & 1) << 15;
|
|
}
|
|
if (ar == 0) /* a 0 value means unusable */
|
|
ar = AR_UNUSABLE_MASK;
|
|
|
|
return ar;
|
|
}
|
|
|
|
static void vmx_set_segment(struct kvm_vcpu *vcpu,
|
|
struct kvm_segment *var, int seg)
|
|
{
|
|
struct kvm_vmx_segment_field *sf = &kvm_vmx_segment_fields[seg];
|
|
u32 ar;
|
|
|
|
if (vcpu->arch.rmode.active && seg == VCPU_SREG_TR) {
|
|
vcpu->arch.rmode.tr.selector = var->selector;
|
|
vcpu->arch.rmode.tr.base = var->base;
|
|
vcpu->arch.rmode.tr.limit = var->limit;
|
|
vcpu->arch.rmode.tr.ar = vmx_segment_access_rights(var);
|
|
return;
|
|
}
|
|
vmcs_writel(sf->base, var->base);
|
|
vmcs_write32(sf->limit, var->limit);
|
|
vmcs_write16(sf->selector, var->selector);
|
|
if (vcpu->arch.rmode.active && var->s) {
|
|
/*
|
|
* Hack real-mode segments into vm86 compatibility.
|
|
*/
|
|
if (var->base == 0xffff0000 && var->selector == 0xf000)
|
|
vmcs_writel(sf->base, 0xf0000);
|
|
ar = 0xf3;
|
|
} else
|
|
ar = vmx_segment_access_rights(var);
|
|
vmcs_write32(sf->ar_bytes, ar);
|
|
}
|
|
|
|
static void vmx_get_cs_db_l_bits(struct kvm_vcpu *vcpu, int *db, int *l)
|
|
{
|
|
u32 ar = vmcs_read32(GUEST_CS_AR_BYTES);
|
|
|
|
*db = (ar >> 14) & 1;
|
|
*l = (ar >> 13) & 1;
|
|
}
|
|
|
|
static void vmx_get_idt(struct kvm_vcpu *vcpu, struct descriptor_table *dt)
|
|
{
|
|
dt->limit = vmcs_read32(GUEST_IDTR_LIMIT);
|
|
dt->base = vmcs_readl(GUEST_IDTR_BASE);
|
|
}
|
|
|
|
static void vmx_set_idt(struct kvm_vcpu *vcpu, struct descriptor_table *dt)
|
|
{
|
|
vmcs_write32(GUEST_IDTR_LIMIT, dt->limit);
|
|
vmcs_writel(GUEST_IDTR_BASE, dt->base);
|
|
}
|
|
|
|
static void vmx_get_gdt(struct kvm_vcpu *vcpu, struct descriptor_table *dt)
|
|
{
|
|
dt->limit = vmcs_read32(GUEST_GDTR_LIMIT);
|
|
dt->base = vmcs_readl(GUEST_GDTR_BASE);
|
|
}
|
|
|
|
static void vmx_set_gdt(struct kvm_vcpu *vcpu, struct descriptor_table *dt)
|
|
{
|
|
vmcs_write32(GUEST_GDTR_LIMIT, dt->limit);
|
|
vmcs_writel(GUEST_GDTR_BASE, dt->base);
|
|
}
|
|
|
|
static bool rmode_segment_valid(struct kvm_vcpu *vcpu, int seg)
|
|
{
|
|
struct kvm_segment var;
|
|
u32 ar;
|
|
|
|
vmx_get_segment(vcpu, &var, seg);
|
|
ar = vmx_segment_access_rights(&var);
|
|
|
|
if (var.base != (var.selector << 4))
|
|
return false;
|
|
if (var.limit != 0xffff)
|
|
return false;
|
|
if (ar != 0xf3)
|
|
return false;
|
|
|
|
return true;
|
|
}
|
|
|
|
static bool code_segment_valid(struct kvm_vcpu *vcpu)
|
|
{
|
|
struct kvm_segment cs;
|
|
unsigned int cs_rpl;
|
|
|
|
vmx_get_segment(vcpu, &cs, VCPU_SREG_CS);
|
|
cs_rpl = cs.selector & SELECTOR_RPL_MASK;
|
|
|
|
if (cs.unusable)
|
|
return false;
|
|
if (~cs.type & (AR_TYPE_CODE_MASK|AR_TYPE_ACCESSES_MASK))
|
|
return false;
|
|
if (!cs.s)
|
|
return false;
|
|
if (cs.type & AR_TYPE_WRITEABLE_MASK) {
|
|
if (cs.dpl > cs_rpl)
|
|
return false;
|
|
} else {
|
|
if (cs.dpl != cs_rpl)
|
|
return false;
|
|
}
|
|
if (!cs.present)
|
|
return false;
|
|
|
|
/* TODO: Add Reserved field check, this'll require a new member in the kvm_segment_field structure */
|
|
return true;
|
|
}
|
|
|
|
static bool stack_segment_valid(struct kvm_vcpu *vcpu)
|
|
{
|
|
struct kvm_segment ss;
|
|
unsigned int ss_rpl;
|
|
|
|
vmx_get_segment(vcpu, &ss, VCPU_SREG_SS);
|
|
ss_rpl = ss.selector & SELECTOR_RPL_MASK;
|
|
|
|
if (ss.unusable)
|
|
return true;
|
|
if (ss.type != 3 && ss.type != 7)
|
|
return false;
|
|
if (!ss.s)
|
|
return false;
|
|
if (ss.dpl != ss_rpl) /* DPL != RPL */
|
|
return false;
|
|
if (!ss.present)
|
|
return false;
|
|
|
|
return true;
|
|
}
|
|
|
|
static bool data_segment_valid(struct kvm_vcpu *vcpu, int seg)
|
|
{
|
|
struct kvm_segment var;
|
|
unsigned int rpl;
|
|
|
|
vmx_get_segment(vcpu, &var, seg);
|
|
rpl = var.selector & SELECTOR_RPL_MASK;
|
|
|
|
if (var.unusable)
|
|
return true;
|
|
if (!var.s)
|
|
return false;
|
|
if (!var.present)
|
|
return false;
|
|
if (~var.type & (AR_TYPE_CODE_MASK|AR_TYPE_WRITEABLE_MASK)) {
|
|
if (var.dpl < rpl) /* DPL < RPL */
|
|
return false;
|
|
}
|
|
|
|
/* TODO: Add other members to kvm_segment_field to allow checking for other access
|
|
* rights flags
|
|
*/
|
|
return true;
|
|
}
|
|
|
|
static bool tr_valid(struct kvm_vcpu *vcpu)
|
|
{
|
|
struct kvm_segment tr;
|
|
|
|
vmx_get_segment(vcpu, &tr, VCPU_SREG_TR);
|
|
|
|
if (tr.unusable)
|
|
return false;
|
|
if (tr.selector & SELECTOR_TI_MASK) /* TI = 1 */
|
|
return false;
|
|
if (tr.type != 3 && tr.type != 11) /* TODO: Check if guest is in IA32e mode */
|
|
return false;
|
|
if (!tr.present)
|
|
return false;
|
|
|
|
return true;
|
|
}
|
|
|
|
static bool ldtr_valid(struct kvm_vcpu *vcpu)
|
|
{
|
|
struct kvm_segment ldtr;
|
|
|
|
vmx_get_segment(vcpu, &ldtr, VCPU_SREG_LDTR);
|
|
|
|
if (ldtr.unusable)
|
|
return true;
|
|
if (ldtr.selector & SELECTOR_TI_MASK) /* TI = 1 */
|
|
return false;
|
|
if (ldtr.type != 2)
|
|
return false;
|
|
if (!ldtr.present)
|
|
return false;
|
|
|
|
return true;
|
|
}
|
|
|
|
static bool cs_ss_rpl_check(struct kvm_vcpu *vcpu)
|
|
{
|
|
struct kvm_segment cs, ss;
|
|
|
|
vmx_get_segment(vcpu, &cs, VCPU_SREG_CS);
|
|
vmx_get_segment(vcpu, &ss, VCPU_SREG_SS);
|
|
|
|
return ((cs.selector & SELECTOR_RPL_MASK) ==
|
|
(ss.selector & SELECTOR_RPL_MASK));
|
|
}
|
|
|
|
/*
|
|
* Check if guest state is valid. Returns true if valid, false if
|
|
* not.
|
|
* We assume that registers are always usable
|
|
*/
|
|
static bool guest_state_valid(struct kvm_vcpu *vcpu)
|
|
{
|
|
/* real mode guest state checks */
|
|
if (!(vcpu->arch.cr0 & X86_CR0_PE)) {
|
|
if (!rmode_segment_valid(vcpu, VCPU_SREG_CS))
|
|
return false;
|
|
if (!rmode_segment_valid(vcpu, VCPU_SREG_SS))
|
|
return false;
|
|
if (!rmode_segment_valid(vcpu, VCPU_SREG_DS))
|
|
return false;
|
|
if (!rmode_segment_valid(vcpu, VCPU_SREG_ES))
|
|
return false;
|
|
if (!rmode_segment_valid(vcpu, VCPU_SREG_FS))
|
|
return false;
|
|
if (!rmode_segment_valid(vcpu, VCPU_SREG_GS))
|
|
return false;
|
|
} else {
|
|
/* protected mode guest state checks */
|
|
if (!cs_ss_rpl_check(vcpu))
|
|
return false;
|
|
if (!code_segment_valid(vcpu))
|
|
return false;
|
|
if (!stack_segment_valid(vcpu))
|
|
return false;
|
|
if (!data_segment_valid(vcpu, VCPU_SREG_DS))
|
|
return false;
|
|
if (!data_segment_valid(vcpu, VCPU_SREG_ES))
|
|
return false;
|
|
if (!data_segment_valid(vcpu, VCPU_SREG_FS))
|
|
return false;
|
|
if (!data_segment_valid(vcpu, VCPU_SREG_GS))
|
|
return false;
|
|
if (!tr_valid(vcpu))
|
|
return false;
|
|
if (!ldtr_valid(vcpu))
|
|
return false;
|
|
}
|
|
/* TODO:
|
|
* - Add checks on RIP
|
|
* - Add checks on RFLAGS
|
|
*/
|
|
|
|
return true;
|
|
}
|
|
|
|
static int init_rmode_tss(struct kvm *kvm)
|
|
{
|
|
gfn_t fn = rmode_tss_base(kvm) >> PAGE_SHIFT;
|
|
u16 data = 0;
|
|
int ret = 0;
|
|
int r;
|
|
|
|
r = kvm_clear_guest_page(kvm, fn, 0, PAGE_SIZE);
|
|
if (r < 0)
|
|
goto out;
|
|
data = TSS_BASE_SIZE + TSS_REDIRECTION_SIZE;
|
|
r = kvm_write_guest_page(kvm, fn++, &data,
|
|
TSS_IOPB_BASE_OFFSET, sizeof(u16));
|
|
if (r < 0)
|
|
goto out;
|
|
r = kvm_clear_guest_page(kvm, fn++, 0, PAGE_SIZE);
|
|
if (r < 0)
|
|
goto out;
|
|
r = kvm_clear_guest_page(kvm, fn, 0, PAGE_SIZE);
|
|
if (r < 0)
|
|
goto out;
|
|
data = ~0;
|
|
r = kvm_write_guest_page(kvm, fn, &data,
|
|
RMODE_TSS_SIZE - 2 * PAGE_SIZE - 1,
|
|
sizeof(u8));
|
|
if (r < 0)
|
|
goto out;
|
|
|
|
ret = 1;
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
static int init_rmode_identity_map(struct kvm *kvm)
|
|
{
|
|
int i, r, ret;
|
|
pfn_t identity_map_pfn;
|
|
u32 tmp;
|
|
|
|
if (!vm_need_ept())
|
|
return 1;
|
|
if (unlikely(!kvm->arch.ept_identity_pagetable)) {
|
|
printk(KERN_ERR "EPT: identity-mapping pagetable "
|
|
"haven't been allocated!\n");
|
|
return 0;
|
|
}
|
|
if (likely(kvm->arch.ept_identity_pagetable_done))
|
|
return 1;
|
|
ret = 0;
|
|
identity_map_pfn = VMX_EPT_IDENTITY_PAGETABLE_ADDR >> PAGE_SHIFT;
|
|
r = kvm_clear_guest_page(kvm, identity_map_pfn, 0, PAGE_SIZE);
|
|
if (r < 0)
|
|
goto out;
|
|
/* Set up identity-mapping pagetable for EPT in real mode */
|
|
for (i = 0; i < PT32_ENT_PER_PAGE; i++) {
|
|
tmp = (i << 22) + (_PAGE_PRESENT | _PAGE_RW | _PAGE_USER |
|
|
_PAGE_ACCESSED | _PAGE_DIRTY | _PAGE_PSE);
|
|
r = kvm_write_guest_page(kvm, identity_map_pfn,
|
|
&tmp, i * sizeof(tmp), sizeof(tmp));
|
|
if (r < 0)
|
|
goto out;
|
|
}
|
|
kvm->arch.ept_identity_pagetable_done = true;
|
|
ret = 1;
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
static void seg_setup(int seg)
|
|
{
|
|
struct kvm_vmx_segment_field *sf = &kvm_vmx_segment_fields[seg];
|
|
|
|
vmcs_write16(sf->selector, 0);
|
|
vmcs_writel(sf->base, 0);
|
|
vmcs_write32(sf->limit, 0xffff);
|
|
vmcs_write32(sf->ar_bytes, 0xf3);
|
|
}
|
|
|
|
static int alloc_apic_access_page(struct kvm *kvm)
|
|
{
|
|
struct kvm_userspace_memory_region kvm_userspace_mem;
|
|
int r = 0;
|
|
|
|
down_write(&kvm->slots_lock);
|
|
if (kvm->arch.apic_access_page)
|
|
goto out;
|
|
kvm_userspace_mem.slot = APIC_ACCESS_PAGE_PRIVATE_MEMSLOT;
|
|
kvm_userspace_mem.flags = 0;
|
|
kvm_userspace_mem.guest_phys_addr = 0xfee00000ULL;
|
|
kvm_userspace_mem.memory_size = PAGE_SIZE;
|
|
r = __kvm_set_memory_region(kvm, &kvm_userspace_mem, 0);
|
|
if (r)
|
|
goto out;
|
|
|
|
kvm->arch.apic_access_page = gfn_to_page(kvm, 0xfee00);
|
|
out:
|
|
up_write(&kvm->slots_lock);
|
|
return r;
|
|
}
|
|
|
|
static int alloc_identity_pagetable(struct kvm *kvm)
|
|
{
|
|
struct kvm_userspace_memory_region kvm_userspace_mem;
|
|
int r = 0;
|
|
|
|
down_write(&kvm->slots_lock);
|
|
if (kvm->arch.ept_identity_pagetable)
|
|
goto out;
|
|
kvm_userspace_mem.slot = IDENTITY_PAGETABLE_PRIVATE_MEMSLOT;
|
|
kvm_userspace_mem.flags = 0;
|
|
kvm_userspace_mem.guest_phys_addr = VMX_EPT_IDENTITY_PAGETABLE_ADDR;
|
|
kvm_userspace_mem.memory_size = PAGE_SIZE;
|
|
r = __kvm_set_memory_region(kvm, &kvm_userspace_mem, 0);
|
|
if (r)
|
|
goto out;
|
|
|
|
kvm->arch.ept_identity_pagetable = gfn_to_page(kvm,
|
|
VMX_EPT_IDENTITY_PAGETABLE_ADDR >> PAGE_SHIFT);
|
|
out:
|
|
up_write(&kvm->slots_lock);
|
|
return r;
|
|
}
|
|
|
|
static void allocate_vpid(struct vcpu_vmx *vmx)
|
|
{
|
|
int vpid;
|
|
|
|
vmx->vpid = 0;
|
|
if (!enable_vpid || !cpu_has_vmx_vpid())
|
|
return;
|
|
spin_lock(&vmx_vpid_lock);
|
|
vpid = find_first_zero_bit(vmx_vpid_bitmap, VMX_NR_VPIDS);
|
|
if (vpid < VMX_NR_VPIDS) {
|
|
vmx->vpid = vpid;
|
|
__set_bit(vpid, vmx_vpid_bitmap);
|
|
}
|
|
spin_unlock(&vmx_vpid_lock);
|
|
}
|
|
|
|
static void vmx_disable_intercept_for_msr(struct page *msr_bitmap, u32 msr)
|
|
{
|
|
void *va;
|
|
|
|
if (!cpu_has_vmx_msr_bitmap())
|
|
return;
|
|
|
|
/*
|
|
* See Intel PRM Vol. 3, 20.6.9 (MSR-Bitmap Address). Early manuals
|
|
* have the write-low and read-high bitmap offsets the wrong way round.
|
|
* We can control MSRs 0x00000000-0x00001fff and 0xc0000000-0xc0001fff.
|
|
*/
|
|
va = kmap(msr_bitmap);
|
|
if (msr <= 0x1fff) {
|
|
__clear_bit(msr, va + 0x000); /* read-low */
|
|
__clear_bit(msr, va + 0x800); /* write-low */
|
|
} else if ((msr >= 0xc0000000) && (msr <= 0xc0001fff)) {
|
|
msr &= 0x1fff;
|
|
__clear_bit(msr, va + 0x400); /* read-high */
|
|
__clear_bit(msr, va + 0xc00); /* write-high */
|
|
}
|
|
kunmap(msr_bitmap);
|
|
}
|
|
|
|
/*
|
|
* Sets up the vmcs for emulated real mode.
|
|
*/
|
|
static int vmx_vcpu_setup(struct vcpu_vmx *vmx)
|
|
{
|
|
u32 host_sysenter_cs, msr_low, msr_high;
|
|
u32 junk;
|
|
u64 host_pat, tsc_this, tsc_base;
|
|
unsigned long a;
|
|
struct descriptor_table dt;
|
|
int i;
|
|
unsigned long kvm_vmx_return;
|
|
u32 exec_control;
|
|
|
|
/* I/O */
|
|
vmcs_write64(IO_BITMAP_A, page_to_phys(vmx_io_bitmap_a));
|
|
vmcs_write64(IO_BITMAP_B, page_to_phys(vmx_io_bitmap_b));
|
|
|
|
if (cpu_has_vmx_msr_bitmap())
|
|
vmcs_write64(MSR_BITMAP, page_to_phys(vmx_msr_bitmap));
|
|
|
|
vmcs_write64(VMCS_LINK_POINTER, -1ull); /* 22.3.1.5 */
|
|
|
|
/* Control */
|
|
vmcs_write32(PIN_BASED_VM_EXEC_CONTROL,
|
|
vmcs_config.pin_based_exec_ctrl);
|
|
|
|
exec_control = vmcs_config.cpu_based_exec_ctrl;
|
|
if (!vm_need_tpr_shadow(vmx->vcpu.kvm)) {
|
|
exec_control &= ~CPU_BASED_TPR_SHADOW;
|
|
#ifdef CONFIG_X86_64
|
|
exec_control |= CPU_BASED_CR8_STORE_EXITING |
|
|
CPU_BASED_CR8_LOAD_EXITING;
|
|
#endif
|
|
}
|
|
if (!vm_need_ept())
|
|
exec_control |= CPU_BASED_CR3_STORE_EXITING |
|
|
CPU_BASED_CR3_LOAD_EXITING |
|
|
CPU_BASED_INVLPG_EXITING;
|
|
vmcs_write32(CPU_BASED_VM_EXEC_CONTROL, exec_control);
|
|
|
|
if (cpu_has_secondary_exec_ctrls()) {
|
|
exec_control = vmcs_config.cpu_based_2nd_exec_ctrl;
|
|
if (!vm_need_virtualize_apic_accesses(vmx->vcpu.kvm))
|
|
exec_control &=
|
|
~SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES;
|
|
if (vmx->vpid == 0)
|
|
exec_control &= ~SECONDARY_EXEC_ENABLE_VPID;
|
|
if (!vm_need_ept())
|
|
exec_control &= ~SECONDARY_EXEC_ENABLE_EPT;
|
|
vmcs_write32(SECONDARY_VM_EXEC_CONTROL, exec_control);
|
|
}
|
|
|
|
vmcs_write32(PAGE_FAULT_ERROR_CODE_MASK, !!bypass_guest_pf);
|
|
vmcs_write32(PAGE_FAULT_ERROR_CODE_MATCH, !!bypass_guest_pf);
|
|
vmcs_write32(CR3_TARGET_COUNT, 0); /* 22.2.1 */
|
|
|
|
vmcs_writel(HOST_CR0, read_cr0()); /* 22.2.3 */
|
|
vmcs_writel(HOST_CR4, read_cr4()); /* 22.2.3, 22.2.5 */
|
|
vmcs_writel(HOST_CR3, read_cr3()); /* 22.2.3 FIXME: shadow tables */
|
|
|
|
vmcs_write16(HOST_CS_SELECTOR, __KERNEL_CS); /* 22.2.4 */
|
|
vmcs_write16(HOST_DS_SELECTOR, __KERNEL_DS); /* 22.2.4 */
|
|
vmcs_write16(HOST_ES_SELECTOR, __KERNEL_DS); /* 22.2.4 */
|
|
vmcs_write16(HOST_FS_SELECTOR, kvm_read_fs()); /* 22.2.4 */
|
|
vmcs_write16(HOST_GS_SELECTOR, kvm_read_gs()); /* 22.2.4 */
|
|
vmcs_write16(HOST_SS_SELECTOR, __KERNEL_DS); /* 22.2.4 */
|
|
#ifdef CONFIG_X86_64
|
|
rdmsrl(MSR_FS_BASE, a);
|
|
vmcs_writel(HOST_FS_BASE, a); /* 22.2.4 */
|
|
rdmsrl(MSR_GS_BASE, a);
|
|
vmcs_writel(HOST_GS_BASE, a); /* 22.2.4 */
|
|
#else
|
|
vmcs_writel(HOST_FS_BASE, 0); /* 22.2.4 */
|
|
vmcs_writel(HOST_GS_BASE, 0); /* 22.2.4 */
|
|
#endif
|
|
|
|
vmcs_write16(HOST_TR_SELECTOR, GDT_ENTRY_TSS*8); /* 22.2.4 */
|
|
|
|
kvm_get_idt(&dt);
|
|
vmcs_writel(HOST_IDTR_BASE, dt.base); /* 22.2.4 */
|
|
|
|
asm("mov $.Lkvm_vmx_return, %0" : "=r"(kvm_vmx_return));
|
|
vmcs_writel(HOST_RIP, kvm_vmx_return); /* 22.2.5 */
|
|
vmcs_write32(VM_EXIT_MSR_STORE_COUNT, 0);
|
|
vmcs_write32(VM_EXIT_MSR_LOAD_COUNT, 0);
|
|
vmcs_write32(VM_ENTRY_MSR_LOAD_COUNT, 0);
|
|
|
|
rdmsr(MSR_IA32_SYSENTER_CS, host_sysenter_cs, junk);
|
|
vmcs_write32(HOST_IA32_SYSENTER_CS, host_sysenter_cs);
|
|
rdmsrl(MSR_IA32_SYSENTER_ESP, a);
|
|
vmcs_writel(HOST_IA32_SYSENTER_ESP, a); /* 22.2.3 */
|
|
rdmsrl(MSR_IA32_SYSENTER_EIP, a);
|
|
vmcs_writel(HOST_IA32_SYSENTER_EIP, a); /* 22.2.3 */
|
|
|
|
if (vmcs_config.vmexit_ctrl & VM_EXIT_LOAD_IA32_PAT) {
|
|
rdmsr(MSR_IA32_CR_PAT, msr_low, msr_high);
|
|
host_pat = msr_low | ((u64) msr_high << 32);
|
|
vmcs_write64(HOST_IA32_PAT, host_pat);
|
|
}
|
|
if (vmcs_config.vmentry_ctrl & VM_ENTRY_LOAD_IA32_PAT) {
|
|
rdmsr(MSR_IA32_CR_PAT, msr_low, msr_high);
|
|
host_pat = msr_low | ((u64) msr_high << 32);
|
|
/* Write the default value follow host pat */
|
|
vmcs_write64(GUEST_IA32_PAT, host_pat);
|
|
/* Keep arch.pat sync with GUEST_IA32_PAT */
|
|
vmx->vcpu.arch.pat = host_pat;
|
|
}
|
|
|
|
for (i = 0; i < NR_VMX_MSR; ++i) {
|
|
u32 index = vmx_msr_index[i];
|
|
u32 data_low, data_high;
|
|
u64 data;
|
|
int j = vmx->nmsrs;
|
|
|
|
if (rdmsr_safe(index, &data_low, &data_high) < 0)
|
|
continue;
|
|
if (wrmsr_safe(index, data_low, data_high) < 0)
|
|
continue;
|
|
data = data_low | ((u64)data_high << 32);
|
|
vmx->host_msrs[j].index = index;
|
|
vmx->host_msrs[j].reserved = 0;
|
|
vmx->host_msrs[j].data = data;
|
|
vmx->guest_msrs[j] = vmx->host_msrs[j];
|
|
++vmx->nmsrs;
|
|
}
|
|
|
|
vmcs_write32(VM_EXIT_CONTROLS, vmcs_config.vmexit_ctrl);
|
|
|
|
/* 22.2.1, 20.8.1 */
|
|
vmcs_write32(VM_ENTRY_CONTROLS, vmcs_config.vmentry_ctrl);
|
|
|
|
vmcs_writel(CR0_GUEST_HOST_MASK, ~0UL);
|
|
vmcs_writel(CR4_GUEST_HOST_MASK, KVM_GUEST_CR4_MASK);
|
|
|
|
tsc_base = vmx->vcpu.kvm->arch.vm_init_tsc;
|
|
rdtscll(tsc_this);
|
|
if (tsc_this < vmx->vcpu.kvm->arch.vm_init_tsc)
|
|
tsc_base = tsc_this;
|
|
|
|
guest_write_tsc(0, tsc_base);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int init_rmode(struct kvm *kvm)
|
|
{
|
|
if (!init_rmode_tss(kvm))
|
|
return 0;
|
|
if (!init_rmode_identity_map(kvm))
|
|
return 0;
|
|
return 1;
|
|
}
|
|
|
|
static int vmx_vcpu_reset(struct kvm_vcpu *vcpu)
|
|
{
|
|
struct vcpu_vmx *vmx = to_vmx(vcpu);
|
|
u64 msr;
|
|
int ret;
|
|
|
|
vcpu->arch.regs_avail = ~((1 << VCPU_REGS_RIP) | (1 << VCPU_REGS_RSP));
|
|
down_read(&vcpu->kvm->slots_lock);
|
|
if (!init_rmode(vmx->vcpu.kvm)) {
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
vmx->vcpu.arch.rmode.active = 0;
|
|
|
|
vmx->soft_vnmi_blocked = 0;
|
|
|
|
vmx->vcpu.arch.regs[VCPU_REGS_RDX] = get_rdx_init_val();
|
|
kvm_set_cr8(&vmx->vcpu, 0);
|
|
msr = 0xfee00000 | MSR_IA32_APICBASE_ENABLE;
|
|
if (vmx->vcpu.vcpu_id == 0)
|
|
msr |= MSR_IA32_APICBASE_BSP;
|
|
kvm_set_apic_base(&vmx->vcpu, msr);
|
|
|
|
fx_init(&vmx->vcpu);
|
|
|
|
seg_setup(VCPU_SREG_CS);
|
|
/*
|
|
* GUEST_CS_BASE should really be 0xffff0000, but VT vm86 mode
|
|
* insists on having GUEST_CS_BASE == GUEST_CS_SELECTOR << 4. Sigh.
|
|
*/
|
|
if (vmx->vcpu.vcpu_id == 0) {
|
|
vmcs_write16(GUEST_CS_SELECTOR, 0xf000);
|
|
vmcs_writel(GUEST_CS_BASE, 0x000f0000);
|
|
} else {
|
|
vmcs_write16(GUEST_CS_SELECTOR, vmx->vcpu.arch.sipi_vector << 8);
|
|
vmcs_writel(GUEST_CS_BASE, vmx->vcpu.arch.sipi_vector << 12);
|
|
}
|
|
|
|
seg_setup(VCPU_SREG_DS);
|
|
seg_setup(VCPU_SREG_ES);
|
|
seg_setup(VCPU_SREG_FS);
|
|
seg_setup(VCPU_SREG_GS);
|
|
seg_setup(VCPU_SREG_SS);
|
|
|
|
vmcs_write16(GUEST_TR_SELECTOR, 0);
|
|
vmcs_writel(GUEST_TR_BASE, 0);
|
|
vmcs_write32(GUEST_TR_LIMIT, 0xffff);
|
|
vmcs_write32(GUEST_TR_AR_BYTES, 0x008b);
|
|
|
|
vmcs_write16(GUEST_LDTR_SELECTOR, 0);
|
|
vmcs_writel(GUEST_LDTR_BASE, 0);
|
|
vmcs_write32(GUEST_LDTR_LIMIT, 0xffff);
|
|
vmcs_write32(GUEST_LDTR_AR_BYTES, 0x00082);
|
|
|
|
vmcs_write32(GUEST_SYSENTER_CS, 0);
|
|
vmcs_writel(GUEST_SYSENTER_ESP, 0);
|
|
vmcs_writel(GUEST_SYSENTER_EIP, 0);
|
|
|
|
vmcs_writel(GUEST_RFLAGS, 0x02);
|
|
if (vmx->vcpu.vcpu_id == 0)
|
|
kvm_rip_write(vcpu, 0xfff0);
|
|
else
|
|
kvm_rip_write(vcpu, 0);
|
|
kvm_register_write(vcpu, VCPU_REGS_RSP, 0);
|
|
|
|
vmcs_writel(GUEST_DR7, 0x400);
|
|
|
|
vmcs_writel(GUEST_GDTR_BASE, 0);
|
|
vmcs_write32(GUEST_GDTR_LIMIT, 0xffff);
|
|
|
|
vmcs_writel(GUEST_IDTR_BASE, 0);
|
|
vmcs_write32(GUEST_IDTR_LIMIT, 0xffff);
|
|
|
|
vmcs_write32(GUEST_ACTIVITY_STATE, 0);
|
|
vmcs_write32(GUEST_INTERRUPTIBILITY_INFO, 0);
|
|
vmcs_write32(GUEST_PENDING_DBG_EXCEPTIONS, 0);
|
|
|
|
/* Special registers */
|
|
vmcs_write64(GUEST_IA32_DEBUGCTL, 0);
|
|
|
|
setup_msrs(vmx);
|
|
|
|
vmcs_write32(VM_ENTRY_INTR_INFO_FIELD, 0); /* 22.2.1 */
|
|
|
|
if (cpu_has_vmx_tpr_shadow()) {
|
|
vmcs_write64(VIRTUAL_APIC_PAGE_ADDR, 0);
|
|
if (vm_need_tpr_shadow(vmx->vcpu.kvm))
|
|
vmcs_write64(VIRTUAL_APIC_PAGE_ADDR,
|
|
page_to_phys(vmx->vcpu.arch.apic->regs_page));
|
|
vmcs_write32(TPR_THRESHOLD, 0);
|
|
}
|
|
|
|
if (vm_need_virtualize_apic_accesses(vmx->vcpu.kvm))
|
|
vmcs_write64(APIC_ACCESS_ADDR,
|
|
page_to_phys(vmx->vcpu.kvm->arch.apic_access_page));
|
|
|
|
if (vmx->vpid != 0)
|
|
vmcs_write16(VIRTUAL_PROCESSOR_ID, vmx->vpid);
|
|
|
|
vmx->vcpu.arch.cr0 = 0x60000010;
|
|
vmx_set_cr0(&vmx->vcpu, vmx->vcpu.arch.cr0); /* enter rmode */
|
|
vmx_set_cr4(&vmx->vcpu, 0);
|
|
vmx_set_efer(&vmx->vcpu, 0);
|
|
vmx_fpu_activate(&vmx->vcpu);
|
|
update_exception_bitmap(&vmx->vcpu);
|
|
|
|
vpid_sync_vcpu_all(vmx);
|
|
|
|
ret = 0;
|
|
|
|
/* HACK: Don't enable emulation on guest boot/reset */
|
|
vmx->emulation_required = 0;
|
|
|
|
out:
|
|
up_read(&vcpu->kvm->slots_lock);
|
|
return ret;
|
|
}
|
|
|
|
static void enable_irq_window(struct kvm_vcpu *vcpu)
|
|
{
|
|
u32 cpu_based_vm_exec_control;
|
|
|
|
cpu_based_vm_exec_control = vmcs_read32(CPU_BASED_VM_EXEC_CONTROL);
|
|
cpu_based_vm_exec_control |= CPU_BASED_VIRTUAL_INTR_PENDING;
|
|
vmcs_write32(CPU_BASED_VM_EXEC_CONTROL, cpu_based_vm_exec_control);
|
|
}
|
|
|
|
static void enable_nmi_window(struct kvm_vcpu *vcpu)
|
|
{
|
|
u32 cpu_based_vm_exec_control;
|
|
|
|
if (!cpu_has_virtual_nmis()) {
|
|
enable_irq_window(vcpu);
|
|
return;
|
|
}
|
|
|
|
cpu_based_vm_exec_control = vmcs_read32(CPU_BASED_VM_EXEC_CONTROL);
|
|
cpu_based_vm_exec_control |= CPU_BASED_VIRTUAL_NMI_PENDING;
|
|
vmcs_write32(CPU_BASED_VM_EXEC_CONTROL, cpu_based_vm_exec_control);
|
|
}
|
|
|
|
static void vmx_inject_irq(struct kvm_vcpu *vcpu, int irq)
|
|
{
|
|
struct vcpu_vmx *vmx = to_vmx(vcpu);
|
|
|
|
KVMTRACE_1D(INJ_VIRQ, vcpu, (u32)irq, handler);
|
|
|
|
++vcpu->stat.irq_injections;
|
|
if (vcpu->arch.rmode.active) {
|
|
vmx->rmode.irq.pending = true;
|
|
vmx->rmode.irq.vector = irq;
|
|
vmx->rmode.irq.rip = kvm_rip_read(vcpu);
|
|
vmcs_write32(VM_ENTRY_INTR_INFO_FIELD,
|
|
irq | INTR_TYPE_SOFT_INTR | INTR_INFO_VALID_MASK);
|
|
vmcs_write32(VM_ENTRY_INSTRUCTION_LEN, 1);
|
|
kvm_rip_write(vcpu, vmx->rmode.irq.rip - 1);
|
|
return;
|
|
}
|
|
vmcs_write32(VM_ENTRY_INTR_INFO_FIELD,
|
|
irq | INTR_TYPE_EXT_INTR | INTR_INFO_VALID_MASK);
|
|
}
|
|
|
|
static void vmx_inject_nmi(struct kvm_vcpu *vcpu)
|
|
{
|
|
struct vcpu_vmx *vmx = to_vmx(vcpu);
|
|
|
|
if (!cpu_has_virtual_nmis()) {
|
|
/*
|
|
* Tracking the NMI-blocked state in software is built upon
|
|
* finding the next open IRQ window. This, in turn, depends on
|
|
* well-behaving guests: They have to keep IRQs disabled at
|
|
* least as long as the NMI handler runs. Otherwise we may
|
|
* cause NMI nesting, maybe breaking the guest. But as this is
|
|
* highly unlikely, we can live with the residual risk.
|
|
*/
|
|
vmx->soft_vnmi_blocked = 1;
|
|
vmx->vnmi_blocked_time = 0;
|
|
}
|
|
|
|
++vcpu->stat.nmi_injections;
|
|
if (vcpu->arch.rmode.active) {
|
|
vmx->rmode.irq.pending = true;
|
|
vmx->rmode.irq.vector = NMI_VECTOR;
|
|
vmx->rmode.irq.rip = kvm_rip_read(vcpu);
|
|
vmcs_write32(VM_ENTRY_INTR_INFO_FIELD,
|
|
NMI_VECTOR | INTR_TYPE_SOFT_INTR |
|
|
INTR_INFO_VALID_MASK);
|
|
vmcs_write32(VM_ENTRY_INSTRUCTION_LEN, 1);
|
|
kvm_rip_write(vcpu, vmx->rmode.irq.rip - 1);
|
|
return;
|
|
}
|
|
vmcs_write32(VM_ENTRY_INTR_INFO_FIELD,
|
|
INTR_TYPE_NMI_INTR | INTR_INFO_VALID_MASK | NMI_VECTOR);
|
|
}
|
|
|
|
static void vmx_update_window_states(struct kvm_vcpu *vcpu)
|
|
{
|
|
u32 guest_intr = vmcs_read32(GUEST_INTERRUPTIBILITY_INFO);
|
|
|
|
vcpu->arch.nmi_window_open =
|
|
!(guest_intr & (GUEST_INTR_STATE_STI |
|
|
GUEST_INTR_STATE_MOV_SS |
|
|
GUEST_INTR_STATE_NMI));
|
|
if (!cpu_has_virtual_nmis() && to_vmx(vcpu)->soft_vnmi_blocked)
|
|
vcpu->arch.nmi_window_open = 0;
|
|
|
|
vcpu->arch.interrupt_window_open =
|
|
((vmcs_readl(GUEST_RFLAGS) & X86_EFLAGS_IF) &&
|
|
!(guest_intr & (GUEST_INTR_STATE_STI |
|
|
GUEST_INTR_STATE_MOV_SS)));
|
|
}
|
|
|
|
static void kvm_do_inject_irq(struct kvm_vcpu *vcpu)
|
|
{
|
|
int word_index = __ffs(vcpu->arch.irq_summary);
|
|
int bit_index = __ffs(vcpu->arch.irq_pending[word_index]);
|
|
int irq = word_index * BITS_PER_LONG + bit_index;
|
|
|
|
clear_bit(bit_index, &vcpu->arch.irq_pending[word_index]);
|
|
if (!vcpu->arch.irq_pending[word_index])
|
|
clear_bit(word_index, &vcpu->arch.irq_summary);
|
|
kvm_queue_interrupt(vcpu, irq);
|
|
}
|
|
|
|
static void do_interrupt_requests(struct kvm_vcpu *vcpu,
|
|
struct kvm_run *kvm_run)
|
|
{
|
|
vmx_update_window_states(vcpu);
|
|
|
|
if (vcpu->guest_debug & KVM_GUESTDBG_SINGLESTEP)
|
|
vmcs_clear_bits(GUEST_INTERRUPTIBILITY_INFO,
|
|
GUEST_INTR_STATE_STI |
|
|
GUEST_INTR_STATE_MOV_SS);
|
|
|
|
if (vcpu->arch.nmi_pending && !vcpu->arch.nmi_injected) {
|
|
if (vcpu->arch.interrupt.pending) {
|
|
enable_nmi_window(vcpu);
|
|
} else if (vcpu->arch.nmi_window_open) {
|
|
vcpu->arch.nmi_pending = false;
|
|
vcpu->arch.nmi_injected = true;
|
|
} else {
|
|
enable_nmi_window(vcpu);
|
|
return;
|
|
}
|
|
}
|
|
if (vcpu->arch.nmi_injected) {
|
|
vmx_inject_nmi(vcpu);
|
|
if (vcpu->arch.nmi_pending)
|
|
enable_nmi_window(vcpu);
|
|
else if (vcpu->arch.irq_summary
|
|
|| kvm_run->request_interrupt_window)
|
|
enable_irq_window(vcpu);
|
|
return;
|
|
}
|
|
|
|
if (vcpu->arch.interrupt_window_open) {
|
|
if (vcpu->arch.irq_summary && !vcpu->arch.interrupt.pending)
|
|
kvm_do_inject_irq(vcpu);
|
|
|
|
if (vcpu->arch.interrupt.pending)
|
|
vmx_inject_irq(vcpu, vcpu->arch.interrupt.nr);
|
|
}
|
|
if (!vcpu->arch.interrupt_window_open &&
|
|
(vcpu->arch.irq_summary || kvm_run->request_interrupt_window))
|
|
enable_irq_window(vcpu);
|
|
}
|
|
|
|
static int vmx_set_tss_addr(struct kvm *kvm, unsigned int addr)
|
|
{
|
|
int ret;
|
|
struct kvm_userspace_memory_region tss_mem = {
|
|
.slot = TSS_PRIVATE_MEMSLOT,
|
|
.guest_phys_addr = addr,
|
|
.memory_size = PAGE_SIZE * 3,
|
|
.flags = 0,
|
|
};
|
|
|
|
ret = kvm_set_memory_region(kvm, &tss_mem, 0);
|
|
if (ret)
|
|
return ret;
|
|
kvm->arch.tss_addr = addr;
|
|
return 0;
|
|
}
|
|
|
|
static int handle_rmode_exception(struct kvm_vcpu *vcpu,
|
|
int vec, u32 err_code)
|
|
{
|
|
/*
|
|
* Instruction with address size override prefix opcode 0x67
|
|
* Cause the #SS fault with 0 error code in VM86 mode.
|
|
*/
|
|
if (((vec == GP_VECTOR) || (vec == SS_VECTOR)) && err_code == 0)
|
|
if (emulate_instruction(vcpu, NULL, 0, 0, 0) == EMULATE_DONE)
|
|
return 1;
|
|
/*
|
|
* Forward all other exceptions that are valid in real mode.
|
|
* FIXME: Breaks guest debugging in real mode, needs to be fixed with
|
|
* the required debugging infrastructure rework.
|
|
*/
|
|
switch (vec) {
|
|
case DB_VECTOR:
|
|
if (vcpu->guest_debug &
|
|
(KVM_GUESTDBG_SINGLESTEP | KVM_GUESTDBG_USE_HW_BP))
|
|
return 0;
|
|
kvm_queue_exception(vcpu, vec);
|
|
return 1;
|
|
case BP_VECTOR:
|
|
if (vcpu->guest_debug & KVM_GUESTDBG_USE_SW_BP)
|
|
return 0;
|
|
/* fall through */
|
|
case DE_VECTOR:
|
|
case OF_VECTOR:
|
|
case BR_VECTOR:
|
|
case UD_VECTOR:
|
|
case DF_VECTOR:
|
|
case SS_VECTOR:
|
|
case GP_VECTOR:
|
|
case MF_VECTOR:
|
|
kvm_queue_exception(vcpu, vec);
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int handle_exception(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
|
|
{
|
|
struct vcpu_vmx *vmx = to_vmx(vcpu);
|
|
u32 intr_info, ex_no, error_code;
|
|
unsigned long cr2, rip, dr6;
|
|
u32 vect_info;
|
|
enum emulation_result er;
|
|
|
|
vect_info = vmx->idt_vectoring_info;
|
|
intr_info = vmcs_read32(VM_EXIT_INTR_INFO);
|
|
|
|
if ((vect_info & VECTORING_INFO_VALID_MASK) &&
|
|
!is_page_fault(intr_info))
|
|
printk(KERN_ERR "%s: unexpected, vectoring info 0x%x "
|
|
"intr info 0x%x\n", __func__, vect_info, intr_info);
|
|
|
|
if (!irqchip_in_kernel(vcpu->kvm) && is_external_interrupt(vect_info)) {
|
|
int irq = vect_info & VECTORING_INFO_VECTOR_MASK;
|
|
set_bit(irq, vcpu->arch.irq_pending);
|
|
set_bit(irq / BITS_PER_LONG, &vcpu->arch.irq_summary);
|
|
}
|
|
|
|
if ((intr_info & INTR_INFO_INTR_TYPE_MASK) == INTR_TYPE_NMI_INTR)
|
|
return 1; /* already handled by vmx_vcpu_run() */
|
|
|
|
if (is_no_device(intr_info)) {
|
|
vmx_fpu_activate(vcpu);
|
|
return 1;
|
|
}
|
|
|
|
if (is_invalid_opcode(intr_info)) {
|
|
er = emulate_instruction(vcpu, kvm_run, 0, 0, EMULTYPE_TRAP_UD);
|
|
if (er != EMULATE_DONE)
|
|
kvm_queue_exception(vcpu, UD_VECTOR);
|
|
return 1;
|
|
}
|
|
|
|
error_code = 0;
|
|
rip = kvm_rip_read(vcpu);
|
|
if (intr_info & INTR_INFO_DELIVER_CODE_MASK)
|
|
error_code = vmcs_read32(VM_EXIT_INTR_ERROR_CODE);
|
|
if (is_page_fault(intr_info)) {
|
|
/* EPT won't cause page fault directly */
|
|
if (vm_need_ept())
|
|
BUG();
|
|
cr2 = vmcs_readl(EXIT_QUALIFICATION);
|
|
KVMTRACE_3D(PAGE_FAULT, vcpu, error_code, (u32)cr2,
|
|
(u32)((u64)cr2 >> 32), handler);
|
|
if (vcpu->arch.interrupt.pending || vcpu->arch.exception.pending)
|
|
kvm_mmu_unprotect_page_virt(vcpu, cr2);
|
|
return kvm_mmu_page_fault(vcpu, cr2, error_code);
|
|
}
|
|
|
|
if (vcpu->arch.rmode.active &&
|
|
handle_rmode_exception(vcpu, intr_info & INTR_INFO_VECTOR_MASK,
|
|
error_code)) {
|
|
if (vcpu->arch.halt_request) {
|
|
vcpu->arch.halt_request = 0;
|
|
return kvm_emulate_halt(vcpu);
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
ex_no = intr_info & INTR_INFO_VECTOR_MASK;
|
|
switch (ex_no) {
|
|
case DB_VECTOR:
|
|
dr6 = vmcs_readl(EXIT_QUALIFICATION);
|
|
if (!(vcpu->guest_debug &
|
|
(KVM_GUESTDBG_SINGLESTEP | KVM_GUESTDBG_USE_HW_BP))) {
|
|
vcpu->arch.dr6 = dr6 | DR6_FIXED_1;
|
|
kvm_queue_exception(vcpu, DB_VECTOR);
|
|
return 1;
|
|
}
|
|
kvm_run->debug.arch.dr6 = dr6 | DR6_FIXED_1;
|
|
kvm_run->debug.arch.dr7 = vmcs_readl(GUEST_DR7);
|
|
/* fall through */
|
|
case BP_VECTOR:
|
|
kvm_run->exit_reason = KVM_EXIT_DEBUG;
|
|
kvm_run->debug.arch.pc = vmcs_readl(GUEST_CS_BASE) + rip;
|
|
kvm_run->debug.arch.exception = ex_no;
|
|
break;
|
|
default:
|
|
kvm_run->exit_reason = KVM_EXIT_EXCEPTION;
|
|
kvm_run->ex.exception = ex_no;
|
|
kvm_run->ex.error_code = error_code;
|
|
break;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int handle_external_interrupt(struct kvm_vcpu *vcpu,
|
|
struct kvm_run *kvm_run)
|
|
{
|
|
++vcpu->stat.irq_exits;
|
|
KVMTRACE_1D(INTR, vcpu, vmcs_read32(VM_EXIT_INTR_INFO), handler);
|
|
return 1;
|
|
}
|
|
|
|
static int handle_triple_fault(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
|
|
{
|
|
kvm_run->exit_reason = KVM_EXIT_SHUTDOWN;
|
|
return 0;
|
|
}
|
|
|
|
static int handle_io(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
|
|
{
|
|
unsigned long exit_qualification;
|
|
int size, in, string;
|
|
unsigned port;
|
|
|
|
++vcpu->stat.io_exits;
|
|
exit_qualification = vmcs_readl(EXIT_QUALIFICATION);
|
|
string = (exit_qualification & 16) != 0;
|
|
|
|
if (string) {
|
|
if (emulate_instruction(vcpu,
|
|
kvm_run, 0, 0, 0) == EMULATE_DO_MMIO)
|
|
return 0;
|
|
return 1;
|
|
}
|
|
|
|
size = (exit_qualification & 7) + 1;
|
|
in = (exit_qualification & 8) != 0;
|
|
port = exit_qualification >> 16;
|
|
|
|
skip_emulated_instruction(vcpu);
|
|
return kvm_emulate_pio(vcpu, kvm_run, in, size, port);
|
|
}
|
|
|
|
static void
|
|
vmx_patch_hypercall(struct kvm_vcpu *vcpu, unsigned char *hypercall)
|
|
{
|
|
/*
|
|
* Patch in the VMCALL instruction:
|
|
*/
|
|
hypercall[0] = 0x0f;
|
|
hypercall[1] = 0x01;
|
|
hypercall[2] = 0xc1;
|
|
}
|
|
|
|
static int handle_cr(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
|
|
{
|
|
unsigned long exit_qualification;
|
|
int cr;
|
|
int reg;
|
|
|
|
exit_qualification = vmcs_readl(EXIT_QUALIFICATION);
|
|
cr = exit_qualification & 15;
|
|
reg = (exit_qualification >> 8) & 15;
|
|
switch ((exit_qualification >> 4) & 3) {
|
|
case 0: /* mov to cr */
|
|
KVMTRACE_3D(CR_WRITE, vcpu, (u32)cr,
|
|
(u32)kvm_register_read(vcpu, reg),
|
|
(u32)((u64)kvm_register_read(vcpu, reg) >> 32),
|
|
handler);
|
|
switch (cr) {
|
|
case 0:
|
|
kvm_set_cr0(vcpu, kvm_register_read(vcpu, reg));
|
|
skip_emulated_instruction(vcpu);
|
|
return 1;
|
|
case 3:
|
|
kvm_set_cr3(vcpu, kvm_register_read(vcpu, reg));
|
|
skip_emulated_instruction(vcpu);
|
|
return 1;
|
|
case 4:
|
|
kvm_set_cr4(vcpu, kvm_register_read(vcpu, reg));
|
|
skip_emulated_instruction(vcpu);
|
|
return 1;
|
|
case 8:
|
|
kvm_set_cr8(vcpu, kvm_register_read(vcpu, reg));
|
|
skip_emulated_instruction(vcpu);
|
|
if (irqchip_in_kernel(vcpu->kvm))
|
|
return 1;
|
|
kvm_run->exit_reason = KVM_EXIT_SET_TPR;
|
|
return 0;
|
|
};
|
|
break;
|
|
case 2: /* clts */
|
|
vmx_fpu_deactivate(vcpu);
|
|
vcpu->arch.cr0 &= ~X86_CR0_TS;
|
|
vmcs_writel(CR0_READ_SHADOW, vcpu->arch.cr0);
|
|
vmx_fpu_activate(vcpu);
|
|
KVMTRACE_0D(CLTS, vcpu, handler);
|
|
skip_emulated_instruction(vcpu);
|
|
return 1;
|
|
case 1: /*mov from cr*/
|
|
switch (cr) {
|
|
case 3:
|
|
kvm_register_write(vcpu, reg, vcpu->arch.cr3);
|
|
KVMTRACE_3D(CR_READ, vcpu, (u32)cr,
|
|
(u32)kvm_register_read(vcpu, reg),
|
|
(u32)((u64)kvm_register_read(vcpu, reg) >> 32),
|
|
handler);
|
|
skip_emulated_instruction(vcpu);
|
|
return 1;
|
|
case 8:
|
|
kvm_register_write(vcpu, reg, kvm_get_cr8(vcpu));
|
|
KVMTRACE_2D(CR_READ, vcpu, (u32)cr,
|
|
(u32)kvm_register_read(vcpu, reg), handler);
|
|
skip_emulated_instruction(vcpu);
|
|
return 1;
|
|
}
|
|
break;
|
|
case 3: /* lmsw */
|
|
kvm_lmsw(vcpu, (exit_qualification >> LMSW_SOURCE_DATA_SHIFT) & 0x0f);
|
|
|
|
skip_emulated_instruction(vcpu);
|
|
return 1;
|
|
default:
|
|
break;
|
|
}
|
|
kvm_run->exit_reason = 0;
|
|
pr_unimpl(vcpu, "unhandled control register: op %d cr %d\n",
|
|
(int)(exit_qualification >> 4) & 3, cr);
|
|
return 0;
|
|
}
|
|
|
|
static int handle_dr(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
|
|
{
|
|
unsigned long exit_qualification;
|
|
unsigned long val;
|
|
int dr, reg;
|
|
|
|
dr = vmcs_readl(GUEST_DR7);
|
|
if (dr & DR7_GD) {
|
|
/*
|
|
* As the vm-exit takes precedence over the debug trap, we
|
|
* need to emulate the latter, either for the host or the
|
|
* guest debugging itself.
|
|
*/
|
|
if (vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP) {
|
|
kvm_run->debug.arch.dr6 = vcpu->arch.dr6;
|
|
kvm_run->debug.arch.dr7 = dr;
|
|
kvm_run->debug.arch.pc =
|
|
vmcs_readl(GUEST_CS_BASE) +
|
|
vmcs_readl(GUEST_RIP);
|
|
kvm_run->debug.arch.exception = DB_VECTOR;
|
|
kvm_run->exit_reason = KVM_EXIT_DEBUG;
|
|
return 0;
|
|
} else {
|
|
vcpu->arch.dr7 &= ~DR7_GD;
|
|
vcpu->arch.dr6 |= DR6_BD;
|
|
vmcs_writel(GUEST_DR7, vcpu->arch.dr7);
|
|
kvm_queue_exception(vcpu, DB_VECTOR);
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
exit_qualification = vmcs_readl(EXIT_QUALIFICATION);
|
|
dr = exit_qualification & DEBUG_REG_ACCESS_NUM;
|
|
reg = DEBUG_REG_ACCESS_REG(exit_qualification);
|
|
if (exit_qualification & TYPE_MOV_FROM_DR) {
|
|
switch (dr) {
|
|
case 0 ... 3:
|
|
val = vcpu->arch.db[dr];
|
|
break;
|
|
case 6:
|
|
val = vcpu->arch.dr6;
|
|
break;
|
|
case 7:
|
|
val = vcpu->arch.dr7;
|
|
break;
|
|
default:
|
|
val = 0;
|
|
}
|
|
kvm_register_write(vcpu, reg, val);
|
|
KVMTRACE_2D(DR_READ, vcpu, (u32)dr, (u32)val, handler);
|
|
} else {
|
|
val = vcpu->arch.regs[reg];
|
|
switch (dr) {
|
|
case 0 ... 3:
|
|
vcpu->arch.db[dr] = val;
|
|
if (!(vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP))
|
|
vcpu->arch.eff_db[dr] = val;
|
|
break;
|
|
case 4 ... 5:
|
|
if (vcpu->arch.cr4 & X86_CR4_DE)
|
|
kvm_queue_exception(vcpu, UD_VECTOR);
|
|
break;
|
|
case 6:
|
|
if (val & 0xffffffff00000000ULL) {
|
|
kvm_queue_exception(vcpu, GP_VECTOR);
|
|
break;
|
|
}
|
|
vcpu->arch.dr6 = (val & DR6_VOLATILE) | DR6_FIXED_1;
|
|
break;
|
|
case 7:
|
|
if (val & 0xffffffff00000000ULL) {
|
|
kvm_queue_exception(vcpu, GP_VECTOR);
|
|
break;
|
|
}
|
|
vcpu->arch.dr7 = (val & DR7_VOLATILE) | DR7_FIXED_1;
|
|
if (!(vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP)) {
|
|
vmcs_writel(GUEST_DR7, vcpu->arch.dr7);
|
|
vcpu->arch.switch_db_regs =
|
|
(val & DR7_BP_EN_MASK);
|
|
}
|
|
break;
|
|
}
|
|
KVMTRACE_2D(DR_WRITE, vcpu, (u32)dr, (u32)val, handler);
|
|
}
|
|
skip_emulated_instruction(vcpu);
|
|
return 1;
|
|
}
|
|
|
|
static int handle_cpuid(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
|
|
{
|
|
kvm_emulate_cpuid(vcpu);
|
|
return 1;
|
|
}
|
|
|
|
static int handle_rdmsr(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
|
|
{
|
|
u32 ecx = vcpu->arch.regs[VCPU_REGS_RCX];
|
|
u64 data;
|
|
|
|
if (vmx_get_msr(vcpu, ecx, &data)) {
|
|
kvm_inject_gp(vcpu, 0);
|
|
return 1;
|
|
}
|
|
|
|
KVMTRACE_3D(MSR_READ, vcpu, ecx, (u32)data, (u32)(data >> 32),
|
|
handler);
|
|
|
|
/* FIXME: handling of bits 32:63 of rax, rdx */
|
|
vcpu->arch.regs[VCPU_REGS_RAX] = data & -1u;
|
|
vcpu->arch.regs[VCPU_REGS_RDX] = (data >> 32) & -1u;
|
|
skip_emulated_instruction(vcpu);
|
|
return 1;
|
|
}
|
|
|
|
static int handle_wrmsr(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
|
|
{
|
|
u32 ecx = vcpu->arch.regs[VCPU_REGS_RCX];
|
|
u64 data = (vcpu->arch.regs[VCPU_REGS_RAX] & -1u)
|
|
| ((u64)(vcpu->arch.regs[VCPU_REGS_RDX] & -1u) << 32);
|
|
|
|
KVMTRACE_3D(MSR_WRITE, vcpu, ecx, (u32)data, (u32)(data >> 32),
|
|
handler);
|
|
|
|
if (vmx_set_msr(vcpu, ecx, data) != 0) {
|
|
kvm_inject_gp(vcpu, 0);
|
|
return 1;
|
|
}
|
|
|
|
skip_emulated_instruction(vcpu);
|
|
return 1;
|
|
}
|
|
|
|
static int handle_tpr_below_threshold(struct kvm_vcpu *vcpu,
|
|
struct kvm_run *kvm_run)
|
|
{
|
|
return 1;
|
|
}
|
|
|
|
static int handle_interrupt_window(struct kvm_vcpu *vcpu,
|
|
struct kvm_run *kvm_run)
|
|
{
|
|
u32 cpu_based_vm_exec_control;
|
|
|
|
/* clear pending irq */
|
|
cpu_based_vm_exec_control = vmcs_read32(CPU_BASED_VM_EXEC_CONTROL);
|
|
cpu_based_vm_exec_control &= ~CPU_BASED_VIRTUAL_INTR_PENDING;
|
|
vmcs_write32(CPU_BASED_VM_EXEC_CONTROL, cpu_based_vm_exec_control);
|
|
|
|
KVMTRACE_0D(PEND_INTR, vcpu, handler);
|
|
++vcpu->stat.irq_window_exits;
|
|
|
|
/*
|
|
* If the user space waits to inject interrupts, exit as soon as
|
|
* possible
|
|
*/
|
|
if (kvm_run->request_interrupt_window &&
|
|
!vcpu->arch.irq_summary) {
|
|
kvm_run->exit_reason = KVM_EXIT_IRQ_WINDOW_OPEN;
|
|
return 0;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
static int handle_halt(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
|
|
{
|
|
skip_emulated_instruction(vcpu);
|
|
return kvm_emulate_halt(vcpu);
|
|
}
|
|
|
|
static int handle_vmcall(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
|
|
{
|
|
skip_emulated_instruction(vcpu);
|
|
kvm_emulate_hypercall(vcpu);
|
|
return 1;
|
|
}
|
|
|
|
static int handle_invlpg(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
|
|
{
|
|
u64 exit_qualification = vmcs_read64(EXIT_QUALIFICATION);
|
|
|
|
kvm_mmu_invlpg(vcpu, exit_qualification);
|
|
skip_emulated_instruction(vcpu);
|
|
return 1;
|
|
}
|
|
|
|
static int handle_wbinvd(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
|
|
{
|
|
skip_emulated_instruction(vcpu);
|
|
/* TODO: Add support for VT-d/pass-through device */
|
|
return 1;
|
|
}
|
|
|
|
static int handle_apic_access(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
|
|
{
|
|
u64 exit_qualification;
|
|
enum emulation_result er;
|
|
unsigned long offset;
|
|
|
|
exit_qualification = vmcs_read64(EXIT_QUALIFICATION);
|
|
offset = exit_qualification & 0xffful;
|
|
|
|
er = emulate_instruction(vcpu, kvm_run, 0, 0, 0);
|
|
|
|
if (er != EMULATE_DONE) {
|
|
printk(KERN_ERR
|
|
"Fail to handle apic access vmexit! Offset is 0x%lx\n",
|
|
offset);
|
|
return -ENOTSUPP;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
static int handle_task_switch(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
|
|
{
|
|
struct vcpu_vmx *vmx = to_vmx(vcpu);
|
|
unsigned long exit_qualification;
|
|
u16 tss_selector;
|
|
int reason;
|
|
|
|
exit_qualification = vmcs_readl(EXIT_QUALIFICATION);
|
|
|
|
reason = (u32)exit_qualification >> 30;
|
|
if (reason == TASK_SWITCH_GATE && vmx->vcpu.arch.nmi_injected &&
|
|
(vmx->idt_vectoring_info & VECTORING_INFO_VALID_MASK) &&
|
|
(vmx->idt_vectoring_info & VECTORING_INFO_TYPE_MASK)
|
|
== INTR_TYPE_NMI_INTR) {
|
|
vcpu->arch.nmi_injected = false;
|
|
if (cpu_has_virtual_nmis())
|
|
vmcs_set_bits(GUEST_INTERRUPTIBILITY_INFO,
|
|
GUEST_INTR_STATE_NMI);
|
|
}
|
|
tss_selector = exit_qualification;
|
|
|
|
if (!kvm_task_switch(vcpu, tss_selector, reason))
|
|
return 0;
|
|
|
|
/* clear all local breakpoint enable flags */
|
|
vmcs_writel(GUEST_DR7, vmcs_readl(GUEST_DR7) & ~55);
|
|
|
|
/*
|
|
* TODO: What about debug traps on tss switch?
|
|
* Are we supposed to inject them and update dr6?
|
|
*/
|
|
|
|
return 1;
|
|
}
|
|
|
|
static int handle_ept_violation(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
|
|
{
|
|
u64 exit_qualification;
|
|
gpa_t gpa;
|
|
int gla_validity;
|
|
|
|
exit_qualification = vmcs_read64(EXIT_QUALIFICATION);
|
|
|
|
if (exit_qualification & (1 << 6)) {
|
|
printk(KERN_ERR "EPT: GPA exceeds GAW!\n");
|
|
return -ENOTSUPP;
|
|
}
|
|
|
|
gla_validity = (exit_qualification >> 7) & 0x3;
|
|
if (gla_validity != 0x3 && gla_validity != 0x1 && gla_validity != 0) {
|
|
printk(KERN_ERR "EPT: Handling EPT violation failed!\n");
|
|
printk(KERN_ERR "EPT: GPA: 0x%lx, GVA: 0x%lx\n",
|
|
(long unsigned int)vmcs_read64(GUEST_PHYSICAL_ADDRESS),
|
|
(long unsigned int)vmcs_read64(GUEST_LINEAR_ADDRESS));
|
|
printk(KERN_ERR "EPT: Exit qualification is 0x%lx\n",
|
|
(long unsigned int)exit_qualification);
|
|
kvm_run->exit_reason = KVM_EXIT_UNKNOWN;
|
|
kvm_run->hw.hardware_exit_reason = 0;
|
|
return -ENOTSUPP;
|
|
}
|
|
|
|
gpa = vmcs_read64(GUEST_PHYSICAL_ADDRESS);
|
|
return kvm_mmu_page_fault(vcpu, gpa & PAGE_MASK, 0);
|
|
}
|
|
|
|
static int handle_nmi_window(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
|
|
{
|
|
u32 cpu_based_vm_exec_control;
|
|
|
|
/* clear pending NMI */
|
|
cpu_based_vm_exec_control = vmcs_read32(CPU_BASED_VM_EXEC_CONTROL);
|
|
cpu_based_vm_exec_control &= ~CPU_BASED_VIRTUAL_NMI_PENDING;
|
|
vmcs_write32(CPU_BASED_VM_EXEC_CONTROL, cpu_based_vm_exec_control);
|
|
++vcpu->stat.nmi_window_exits;
|
|
|
|
return 1;
|
|
}
|
|
|
|
static void handle_invalid_guest_state(struct kvm_vcpu *vcpu,
|
|
struct kvm_run *kvm_run)
|
|
{
|
|
struct vcpu_vmx *vmx = to_vmx(vcpu);
|
|
enum emulation_result err = EMULATE_DONE;
|
|
|
|
preempt_enable();
|
|
local_irq_enable();
|
|
|
|
while (!guest_state_valid(vcpu)) {
|
|
err = emulate_instruction(vcpu, kvm_run, 0, 0, 0);
|
|
|
|
if (err == EMULATE_DO_MMIO)
|
|
break;
|
|
|
|
if (err != EMULATE_DONE) {
|
|
kvm_report_emulation_failure(vcpu, "emulation failure");
|
|
return;
|
|
}
|
|
|
|
if (signal_pending(current))
|
|
break;
|
|
if (need_resched())
|
|
schedule();
|
|
}
|
|
|
|
local_irq_disable();
|
|
preempt_disable();
|
|
|
|
vmx->invalid_state_emulation_result = err;
|
|
}
|
|
|
|
/*
|
|
* The exit handlers return 1 if the exit was handled fully and guest execution
|
|
* may resume. Otherwise they set the kvm_run parameter to indicate what needs
|
|
* to be done to userspace and return 0.
|
|
*/
|
|
static int (*kvm_vmx_exit_handlers[])(struct kvm_vcpu *vcpu,
|
|
struct kvm_run *kvm_run) = {
|
|
[EXIT_REASON_EXCEPTION_NMI] = handle_exception,
|
|
[EXIT_REASON_EXTERNAL_INTERRUPT] = handle_external_interrupt,
|
|
[EXIT_REASON_TRIPLE_FAULT] = handle_triple_fault,
|
|
[EXIT_REASON_NMI_WINDOW] = handle_nmi_window,
|
|
[EXIT_REASON_IO_INSTRUCTION] = handle_io,
|
|
[EXIT_REASON_CR_ACCESS] = handle_cr,
|
|
[EXIT_REASON_DR_ACCESS] = handle_dr,
|
|
[EXIT_REASON_CPUID] = handle_cpuid,
|
|
[EXIT_REASON_MSR_READ] = handle_rdmsr,
|
|
[EXIT_REASON_MSR_WRITE] = handle_wrmsr,
|
|
[EXIT_REASON_PENDING_INTERRUPT] = handle_interrupt_window,
|
|
[EXIT_REASON_HLT] = handle_halt,
|
|
[EXIT_REASON_INVLPG] = handle_invlpg,
|
|
[EXIT_REASON_VMCALL] = handle_vmcall,
|
|
[EXIT_REASON_TPR_BELOW_THRESHOLD] = handle_tpr_below_threshold,
|
|
[EXIT_REASON_APIC_ACCESS] = handle_apic_access,
|
|
[EXIT_REASON_WBINVD] = handle_wbinvd,
|
|
[EXIT_REASON_TASK_SWITCH] = handle_task_switch,
|
|
[EXIT_REASON_EPT_VIOLATION] = handle_ept_violation,
|
|
};
|
|
|
|
static const int kvm_vmx_max_exit_handlers =
|
|
ARRAY_SIZE(kvm_vmx_exit_handlers);
|
|
|
|
/*
|
|
* The guest has exited. See if we can fix it or if we need userspace
|
|
* assistance.
|
|
*/
|
|
static int kvm_handle_exit(struct kvm_run *kvm_run, struct kvm_vcpu *vcpu)
|
|
{
|
|
u32 exit_reason = vmcs_read32(VM_EXIT_REASON);
|
|
struct vcpu_vmx *vmx = to_vmx(vcpu);
|
|
u32 vectoring_info = vmx->idt_vectoring_info;
|
|
|
|
KVMTRACE_3D(VMEXIT, vcpu, exit_reason, (u32)kvm_rip_read(vcpu),
|
|
(u32)((u64)kvm_rip_read(vcpu) >> 32), entryexit);
|
|
|
|
/* If we need to emulate an MMIO from handle_invalid_guest_state
|
|
* we just return 0 */
|
|
if (vmx->emulation_required && emulate_invalid_guest_state) {
|
|
if (guest_state_valid(vcpu))
|
|
vmx->emulation_required = 0;
|
|
return vmx->invalid_state_emulation_result != EMULATE_DO_MMIO;
|
|
}
|
|
|
|
/* Access CR3 don't cause VMExit in paging mode, so we need
|
|
* to sync with guest real CR3. */
|
|
if (vm_need_ept() && is_paging(vcpu)) {
|
|
vcpu->arch.cr3 = vmcs_readl(GUEST_CR3);
|
|
ept_load_pdptrs(vcpu);
|
|
}
|
|
|
|
if (unlikely(vmx->fail)) {
|
|
kvm_run->exit_reason = KVM_EXIT_FAIL_ENTRY;
|
|
kvm_run->fail_entry.hardware_entry_failure_reason
|
|
= vmcs_read32(VM_INSTRUCTION_ERROR);
|
|
return 0;
|
|
}
|
|
|
|
if ((vectoring_info & VECTORING_INFO_VALID_MASK) &&
|
|
(exit_reason != EXIT_REASON_EXCEPTION_NMI &&
|
|
exit_reason != EXIT_REASON_EPT_VIOLATION &&
|
|
exit_reason != EXIT_REASON_TASK_SWITCH))
|
|
printk(KERN_WARNING "%s: unexpected, valid vectoring info "
|
|
"(0x%x) and exit reason is 0x%x\n",
|
|
__func__, vectoring_info, exit_reason);
|
|
|
|
if (unlikely(!cpu_has_virtual_nmis() && vmx->soft_vnmi_blocked)) {
|
|
if (vcpu->arch.interrupt_window_open) {
|
|
vmx->soft_vnmi_blocked = 0;
|
|
vcpu->arch.nmi_window_open = 1;
|
|
} else if (vmx->vnmi_blocked_time > 1000000000LL &&
|
|
vcpu->arch.nmi_pending) {
|
|
/*
|
|
* This CPU don't support us in finding the end of an
|
|
* NMI-blocked window if the guest runs with IRQs
|
|
* disabled. So we pull the trigger after 1 s of
|
|
* futile waiting, but inform the user about this.
|
|
*/
|
|
printk(KERN_WARNING "%s: Breaking out of NMI-blocked "
|
|
"state on VCPU %d after 1 s timeout\n",
|
|
__func__, vcpu->vcpu_id);
|
|
vmx->soft_vnmi_blocked = 0;
|
|
vmx->vcpu.arch.nmi_window_open = 1;
|
|
}
|
|
}
|
|
|
|
if (exit_reason < kvm_vmx_max_exit_handlers
|
|
&& kvm_vmx_exit_handlers[exit_reason])
|
|
return kvm_vmx_exit_handlers[exit_reason](vcpu, kvm_run);
|
|
else {
|
|
kvm_run->exit_reason = KVM_EXIT_UNKNOWN;
|
|
kvm_run->hw.hardware_exit_reason = exit_reason;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static void update_tpr_threshold(struct kvm_vcpu *vcpu)
|
|
{
|
|
int max_irr, tpr;
|
|
|
|
if (!vm_need_tpr_shadow(vcpu->kvm))
|
|
return;
|
|
|
|
if (!kvm_lapic_enabled(vcpu) ||
|
|
((max_irr = kvm_lapic_find_highest_irr(vcpu)) == -1)) {
|
|
vmcs_write32(TPR_THRESHOLD, 0);
|
|
return;
|
|
}
|
|
|
|
tpr = (kvm_lapic_get_cr8(vcpu) & 0x0f) << 4;
|
|
vmcs_write32(TPR_THRESHOLD, (max_irr > tpr) ? tpr >> 4 : max_irr >> 4);
|
|
}
|
|
|
|
static void vmx_complete_interrupts(struct vcpu_vmx *vmx)
|
|
{
|
|
u32 exit_intr_info;
|
|
u32 idt_vectoring_info;
|
|
bool unblock_nmi;
|
|
u8 vector;
|
|
int type;
|
|
bool idtv_info_valid;
|
|
u32 error;
|
|
|
|
exit_intr_info = vmcs_read32(VM_EXIT_INTR_INFO);
|
|
if (cpu_has_virtual_nmis()) {
|
|
unblock_nmi = (exit_intr_info & INTR_INFO_UNBLOCK_NMI) != 0;
|
|
vector = exit_intr_info & INTR_INFO_VECTOR_MASK;
|
|
/*
|
|
* SDM 3: 25.7.1.2
|
|
* Re-set bit "block by NMI" before VM entry if vmexit caused by
|
|
* a guest IRET fault.
|
|
*/
|
|
if (unblock_nmi && vector != DF_VECTOR)
|
|
vmcs_set_bits(GUEST_INTERRUPTIBILITY_INFO,
|
|
GUEST_INTR_STATE_NMI);
|
|
} else if (unlikely(vmx->soft_vnmi_blocked))
|
|
vmx->vnmi_blocked_time +=
|
|
ktime_to_ns(ktime_sub(ktime_get(), vmx->entry_time));
|
|
|
|
idt_vectoring_info = vmx->idt_vectoring_info;
|
|
idtv_info_valid = idt_vectoring_info & VECTORING_INFO_VALID_MASK;
|
|
vector = idt_vectoring_info & VECTORING_INFO_VECTOR_MASK;
|
|
type = idt_vectoring_info & VECTORING_INFO_TYPE_MASK;
|
|
if (vmx->vcpu.arch.nmi_injected) {
|
|
/*
|
|
* SDM 3: 25.7.1.2
|
|
* Clear bit "block by NMI" before VM entry if a NMI delivery
|
|
* faulted.
|
|
*/
|
|
if (idtv_info_valid && type == INTR_TYPE_NMI_INTR)
|
|
vmcs_clear_bits(GUEST_INTERRUPTIBILITY_INFO,
|
|
GUEST_INTR_STATE_NMI);
|
|
else
|
|
vmx->vcpu.arch.nmi_injected = false;
|
|
}
|
|
kvm_clear_exception_queue(&vmx->vcpu);
|
|
if (idtv_info_valid && (type == INTR_TYPE_HARD_EXCEPTION ||
|
|
type == INTR_TYPE_SOFT_EXCEPTION)) {
|
|
if (idt_vectoring_info & VECTORING_INFO_DELIVER_CODE_MASK) {
|
|
error = vmcs_read32(IDT_VECTORING_ERROR_CODE);
|
|
kvm_queue_exception_e(&vmx->vcpu, vector, error);
|
|
} else
|
|
kvm_queue_exception(&vmx->vcpu, vector);
|
|
vmx->idt_vectoring_info = 0;
|
|
}
|
|
kvm_clear_interrupt_queue(&vmx->vcpu);
|
|
if (idtv_info_valid && type == INTR_TYPE_EXT_INTR) {
|
|
kvm_queue_interrupt(&vmx->vcpu, vector);
|
|
vmx->idt_vectoring_info = 0;
|
|
}
|
|
}
|
|
|
|
static void vmx_intr_assist(struct kvm_vcpu *vcpu)
|
|
{
|
|
update_tpr_threshold(vcpu);
|
|
|
|
vmx_update_window_states(vcpu);
|
|
|
|
if (vcpu->guest_debug & KVM_GUESTDBG_SINGLESTEP)
|
|
vmcs_clear_bits(GUEST_INTERRUPTIBILITY_INFO,
|
|
GUEST_INTR_STATE_STI |
|
|
GUEST_INTR_STATE_MOV_SS);
|
|
|
|
if (vcpu->arch.nmi_pending && !vcpu->arch.nmi_injected) {
|
|
if (vcpu->arch.interrupt.pending) {
|
|
enable_nmi_window(vcpu);
|
|
} else if (vcpu->arch.nmi_window_open) {
|
|
vcpu->arch.nmi_pending = false;
|
|
vcpu->arch.nmi_injected = true;
|
|
} else {
|
|
enable_nmi_window(vcpu);
|
|
return;
|
|
}
|
|
}
|
|
if (vcpu->arch.nmi_injected) {
|
|
vmx_inject_nmi(vcpu);
|
|
if (vcpu->arch.nmi_pending)
|
|
enable_nmi_window(vcpu);
|
|
else if (kvm_cpu_has_interrupt(vcpu))
|
|
enable_irq_window(vcpu);
|
|
return;
|
|
}
|
|
if (!vcpu->arch.interrupt.pending && kvm_cpu_has_interrupt(vcpu)) {
|
|
if (vcpu->arch.interrupt_window_open)
|
|
kvm_queue_interrupt(vcpu, kvm_cpu_get_interrupt(vcpu));
|
|
else
|
|
enable_irq_window(vcpu);
|
|
}
|
|
if (vcpu->arch.interrupt.pending) {
|
|
vmx_inject_irq(vcpu, vcpu->arch.interrupt.nr);
|
|
if (kvm_cpu_has_interrupt(vcpu))
|
|
enable_irq_window(vcpu);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Failure to inject an interrupt should give us the information
|
|
* in IDT_VECTORING_INFO_FIELD. However, if the failure occurs
|
|
* when fetching the interrupt redirection bitmap in the real-mode
|
|
* tss, this doesn't happen. So we do it ourselves.
|
|
*/
|
|
static void fixup_rmode_irq(struct vcpu_vmx *vmx)
|
|
{
|
|
vmx->rmode.irq.pending = 0;
|
|
if (kvm_rip_read(&vmx->vcpu) + 1 != vmx->rmode.irq.rip)
|
|
return;
|
|
kvm_rip_write(&vmx->vcpu, vmx->rmode.irq.rip);
|
|
if (vmx->idt_vectoring_info & VECTORING_INFO_VALID_MASK) {
|
|
vmx->idt_vectoring_info &= ~VECTORING_INFO_TYPE_MASK;
|
|
vmx->idt_vectoring_info |= INTR_TYPE_EXT_INTR;
|
|
return;
|
|
}
|
|
vmx->idt_vectoring_info =
|
|
VECTORING_INFO_VALID_MASK
|
|
| INTR_TYPE_EXT_INTR
|
|
| vmx->rmode.irq.vector;
|
|
}
|
|
|
|
#ifdef CONFIG_X86_64
|
|
#define R "r"
|
|
#define Q "q"
|
|
#else
|
|
#define R "e"
|
|
#define Q "l"
|
|
#endif
|
|
|
|
static void vmx_vcpu_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
|
|
{
|
|
struct vcpu_vmx *vmx = to_vmx(vcpu);
|
|
u32 intr_info;
|
|
|
|
/* Record the guest's net vcpu time for enforced NMI injections. */
|
|
if (unlikely(!cpu_has_virtual_nmis() && vmx->soft_vnmi_blocked))
|
|
vmx->entry_time = ktime_get();
|
|
|
|
/* Handle invalid guest state instead of entering VMX */
|
|
if (vmx->emulation_required && emulate_invalid_guest_state) {
|
|
handle_invalid_guest_state(vcpu, kvm_run);
|
|
return;
|
|
}
|
|
|
|
if (test_bit(VCPU_REGS_RSP, (unsigned long *)&vcpu->arch.regs_dirty))
|
|
vmcs_writel(GUEST_RSP, vcpu->arch.regs[VCPU_REGS_RSP]);
|
|
if (test_bit(VCPU_REGS_RIP, (unsigned long *)&vcpu->arch.regs_dirty))
|
|
vmcs_writel(GUEST_RIP, vcpu->arch.regs[VCPU_REGS_RIP]);
|
|
|
|
/*
|
|
* Loading guest fpu may have cleared host cr0.ts
|
|
*/
|
|
vmcs_writel(HOST_CR0, read_cr0());
|
|
|
|
set_debugreg(vcpu->arch.dr6, 6);
|
|
|
|
asm(
|
|
/* Store host registers */
|
|
"push %%"R"dx; push %%"R"bp;"
|
|
"push %%"R"cx \n\t"
|
|
"cmp %%"R"sp, %c[host_rsp](%0) \n\t"
|
|
"je 1f \n\t"
|
|
"mov %%"R"sp, %c[host_rsp](%0) \n\t"
|
|
__ex(ASM_VMX_VMWRITE_RSP_RDX) "\n\t"
|
|
"1: \n\t"
|
|
/* Check if vmlaunch of vmresume is needed */
|
|
"cmpl $0, %c[launched](%0) \n\t"
|
|
/* Load guest registers. Don't clobber flags. */
|
|
"mov %c[cr2](%0), %%"R"ax \n\t"
|
|
"mov %%"R"ax, %%cr2 \n\t"
|
|
"mov %c[rax](%0), %%"R"ax \n\t"
|
|
"mov %c[rbx](%0), %%"R"bx \n\t"
|
|
"mov %c[rdx](%0), %%"R"dx \n\t"
|
|
"mov %c[rsi](%0), %%"R"si \n\t"
|
|
"mov %c[rdi](%0), %%"R"di \n\t"
|
|
"mov %c[rbp](%0), %%"R"bp \n\t"
|
|
#ifdef CONFIG_X86_64
|
|
"mov %c[r8](%0), %%r8 \n\t"
|
|
"mov %c[r9](%0), %%r9 \n\t"
|
|
"mov %c[r10](%0), %%r10 \n\t"
|
|
"mov %c[r11](%0), %%r11 \n\t"
|
|
"mov %c[r12](%0), %%r12 \n\t"
|
|
"mov %c[r13](%0), %%r13 \n\t"
|
|
"mov %c[r14](%0), %%r14 \n\t"
|
|
"mov %c[r15](%0), %%r15 \n\t"
|
|
#endif
|
|
"mov %c[rcx](%0), %%"R"cx \n\t" /* kills %0 (ecx) */
|
|
|
|
/* Enter guest mode */
|
|
"jne .Llaunched \n\t"
|
|
__ex(ASM_VMX_VMLAUNCH) "\n\t"
|
|
"jmp .Lkvm_vmx_return \n\t"
|
|
".Llaunched: " __ex(ASM_VMX_VMRESUME) "\n\t"
|
|
".Lkvm_vmx_return: "
|
|
/* Save guest registers, load host registers, keep flags */
|
|
"xchg %0, (%%"R"sp) \n\t"
|
|
"mov %%"R"ax, %c[rax](%0) \n\t"
|
|
"mov %%"R"bx, %c[rbx](%0) \n\t"
|
|
"push"Q" (%%"R"sp); pop"Q" %c[rcx](%0) \n\t"
|
|
"mov %%"R"dx, %c[rdx](%0) \n\t"
|
|
"mov %%"R"si, %c[rsi](%0) \n\t"
|
|
"mov %%"R"di, %c[rdi](%0) \n\t"
|
|
"mov %%"R"bp, %c[rbp](%0) \n\t"
|
|
#ifdef CONFIG_X86_64
|
|
"mov %%r8, %c[r8](%0) \n\t"
|
|
"mov %%r9, %c[r9](%0) \n\t"
|
|
"mov %%r10, %c[r10](%0) \n\t"
|
|
"mov %%r11, %c[r11](%0) \n\t"
|
|
"mov %%r12, %c[r12](%0) \n\t"
|
|
"mov %%r13, %c[r13](%0) \n\t"
|
|
"mov %%r14, %c[r14](%0) \n\t"
|
|
"mov %%r15, %c[r15](%0) \n\t"
|
|
#endif
|
|
"mov %%cr2, %%"R"ax \n\t"
|
|
"mov %%"R"ax, %c[cr2](%0) \n\t"
|
|
|
|
"pop %%"R"bp; pop %%"R"bp; pop %%"R"dx \n\t"
|
|
"setbe %c[fail](%0) \n\t"
|
|
: : "c"(vmx), "d"((unsigned long)HOST_RSP),
|
|
[launched]"i"(offsetof(struct vcpu_vmx, launched)),
|
|
[fail]"i"(offsetof(struct vcpu_vmx, fail)),
|
|
[host_rsp]"i"(offsetof(struct vcpu_vmx, host_rsp)),
|
|
[rax]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_RAX])),
|
|
[rbx]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_RBX])),
|
|
[rcx]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_RCX])),
|
|
[rdx]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_RDX])),
|
|
[rsi]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_RSI])),
|
|
[rdi]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_RDI])),
|
|
[rbp]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_RBP])),
|
|
#ifdef CONFIG_X86_64
|
|
[r8]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_R8])),
|
|
[r9]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_R9])),
|
|
[r10]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_R10])),
|
|
[r11]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_R11])),
|
|
[r12]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_R12])),
|
|
[r13]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_R13])),
|
|
[r14]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_R14])),
|
|
[r15]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_R15])),
|
|
#endif
|
|
[cr2]"i"(offsetof(struct vcpu_vmx, vcpu.arch.cr2))
|
|
: "cc", "memory"
|
|
, R"bx", R"di", R"si"
|
|
#ifdef CONFIG_X86_64
|
|
, "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15"
|
|
#endif
|
|
);
|
|
|
|
vcpu->arch.regs_avail = ~((1 << VCPU_REGS_RIP) | (1 << VCPU_REGS_RSP));
|
|
vcpu->arch.regs_dirty = 0;
|
|
|
|
get_debugreg(vcpu->arch.dr6, 6);
|
|
|
|
vmx->idt_vectoring_info = vmcs_read32(IDT_VECTORING_INFO_FIELD);
|
|
if (vmx->rmode.irq.pending)
|
|
fixup_rmode_irq(vmx);
|
|
|
|
vmx_update_window_states(vcpu);
|
|
|
|
asm("mov %0, %%ds; mov %0, %%es" : : "r"(__USER_DS));
|
|
vmx->launched = 1;
|
|
|
|
intr_info = vmcs_read32(VM_EXIT_INTR_INFO);
|
|
|
|
/* We need to handle NMIs before interrupts are enabled */
|
|
if ((intr_info & INTR_INFO_INTR_TYPE_MASK) == INTR_TYPE_NMI_INTR &&
|
|
(intr_info & INTR_INFO_VALID_MASK)) {
|
|
KVMTRACE_0D(NMI, vcpu, handler);
|
|
asm("int $2");
|
|
}
|
|
|
|
vmx_complete_interrupts(vmx);
|
|
}
|
|
|
|
#undef R
|
|
#undef Q
|
|
|
|
static void vmx_free_vmcs(struct kvm_vcpu *vcpu)
|
|
{
|
|
struct vcpu_vmx *vmx = to_vmx(vcpu);
|
|
|
|
if (vmx->vmcs) {
|
|
vcpu_clear(vmx);
|
|
free_vmcs(vmx->vmcs);
|
|
vmx->vmcs = NULL;
|
|
}
|
|
}
|
|
|
|
static void vmx_free_vcpu(struct kvm_vcpu *vcpu)
|
|
{
|
|
struct vcpu_vmx *vmx = to_vmx(vcpu);
|
|
|
|
spin_lock(&vmx_vpid_lock);
|
|
if (vmx->vpid != 0)
|
|
__clear_bit(vmx->vpid, vmx_vpid_bitmap);
|
|
spin_unlock(&vmx_vpid_lock);
|
|
vmx_free_vmcs(vcpu);
|
|
kfree(vmx->host_msrs);
|
|
kfree(vmx->guest_msrs);
|
|
kvm_vcpu_uninit(vcpu);
|
|
kmem_cache_free(kvm_vcpu_cache, vmx);
|
|
}
|
|
|
|
static struct kvm_vcpu *vmx_create_vcpu(struct kvm *kvm, unsigned int id)
|
|
{
|
|
int err;
|
|
struct vcpu_vmx *vmx = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL);
|
|
int cpu;
|
|
|
|
if (!vmx)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
allocate_vpid(vmx);
|
|
|
|
err = kvm_vcpu_init(&vmx->vcpu, kvm, id);
|
|
if (err)
|
|
goto free_vcpu;
|
|
|
|
vmx->guest_msrs = kmalloc(PAGE_SIZE, GFP_KERNEL);
|
|
if (!vmx->guest_msrs) {
|
|
err = -ENOMEM;
|
|
goto uninit_vcpu;
|
|
}
|
|
|
|
vmx->host_msrs = kmalloc(PAGE_SIZE, GFP_KERNEL);
|
|
if (!vmx->host_msrs)
|
|
goto free_guest_msrs;
|
|
|
|
vmx->vmcs = alloc_vmcs();
|
|
if (!vmx->vmcs)
|
|
goto free_msrs;
|
|
|
|
vmcs_clear(vmx->vmcs);
|
|
|
|
cpu = get_cpu();
|
|
vmx_vcpu_load(&vmx->vcpu, cpu);
|
|
err = vmx_vcpu_setup(vmx);
|
|
vmx_vcpu_put(&vmx->vcpu);
|
|
put_cpu();
|
|
if (err)
|
|
goto free_vmcs;
|
|
if (vm_need_virtualize_apic_accesses(kvm))
|
|
if (alloc_apic_access_page(kvm) != 0)
|
|
goto free_vmcs;
|
|
|
|
if (vm_need_ept())
|
|
if (alloc_identity_pagetable(kvm) != 0)
|
|
goto free_vmcs;
|
|
|
|
return &vmx->vcpu;
|
|
|
|
free_vmcs:
|
|
free_vmcs(vmx->vmcs);
|
|
free_msrs:
|
|
kfree(vmx->host_msrs);
|
|
free_guest_msrs:
|
|
kfree(vmx->guest_msrs);
|
|
uninit_vcpu:
|
|
kvm_vcpu_uninit(&vmx->vcpu);
|
|
free_vcpu:
|
|
kmem_cache_free(kvm_vcpu_cache, vmx);
|
|
return ERR_PTR(err);
|
|
}
|
|
|
|
static void __init vmx_check_processor_compat(void *rtn)
|
|
{
|
|
struct vmcs_config vmcs_conf;
|
|
|
|
*(int *)rtn = 0;
|
|
if (setup_vmcs_config(&vmcs_conf) < 0)
|
|
*(int *)rtn = -EIO;
|
|
if (memcmp(&vmcs_config, &vmcs_conf, sizeof(struct vmcs_config)) != 0) {
|
|
printk(KERN_ERR "kvm: CPU %d feature inconsistency!\n",
|
|
smp_processor_id());
|
|
*(int *)rtn = -EIO;
|
|
}
|
|
}
|
|
|
|
static int get_ept_level(void)
|
|
{
|
|
return VMX_EPT_DEFAULT_GAW + 1;
|
|
}
|
|
|
|
static int vmx_get_mt_mask_shift(void)
|
|
{
|
|
return VMX_EPT_MT_EPTE_SHIFT;
|
|
}
|
|
|
|
static struct kvm_x86_ops vmx_x86_ops = {
|
|
.cpu_has_kvm_support = cpu_has_kvm_support,
|
|
.disabled_by_bios = vmx_disabled_by_bios,
|
|
.hardware_setup = hardware_setup,
|
|
.hardware_unsetup = hardware_unsetup,
|
|
.check_processor_compatibility = vmx_check_processor_compat,
|
|
.hardware_enable = hardware_enable,
|
|
.hardware_disable = hardware_disable,
|
|
.cpu_has_accelerated_tpr = cpu_has_vmx_virtualize_apic_accesses,
|
|
|
|
.vcpu_create = vmx_create_vcpu,
|
|
.vcpu_free = vmx_free_vcpu,
|
|
.vcpu_reset = vmx_vcpu_reset,
|
|
|
|
.prepare_guest_switch = vmx_save_host_state,
|
|
.vcpu_load = vmx_vcpu_load,
|
|
.vcpu_put = vmx_vcpu_put,
|
|
|
|
.set_guest_debug = set_guest_debug,
|
|
.get_msr = vmx_get_msr,
|
|
.set_msr = vmx_set_msr,
|
|
.get_segment_base = vmx_get_segment_base,
|
|
.get_segment = vmx_get_segment,
|
|
.set_segment = vmx_set_segment,
|
|
.get_cpl = vmx_get_cpl,
|
|
.get_cs_db_l_bits = vmx_get_cs_db_l_bits,
|
|
.decache_cr4_guest_bits = vmx_decache_cr4_guest_bits,
|
|
.set_cr0 = vmx_set_cr0,
|
|
.set_cr3 = vmx_set_cr3,
|
|
.set_cr4 = vmx_set_cr4,
|
|
.set_efer = vmx_set_efer,
|
|
.get_idt = vmx_get_idt,
|
|
.set_idt = vmx_set_idt,
|
|
.get_gdt = vmx_get_gdt,
|
|
.set_gdt = vmx_set_gdt,
|
|
.cache_reg = vmx_cache_reg,
|
|
.get_rflags = vmx_get_rflags,
|
|
.set_rflags = vmx_set_rflags,
|
|
|
|
.tlb_flush = vmx_flush_tlb,
|
|
|
|
.run = vmx_vcpu_run,
|
|
.handle_exit = kvm_handle_exit,
|
|
.skip_emulated_instruction = skip_emulated_instruction,
|
|
.patch_hypercall = vmx_patch_hypercall,
|
|
.get_irq = vmx_get_irq,
|
|
.set_irq = vmx_inject_irq,
|
|
.queue_exception = vmx_queue_exception,
|
|
.exception_injected = vmx_exception_injected,
|
|
.inject_pending_irq = vmx_intr_assist,
|
|
.inject_pending_vectors = do_interrupt_requests,
|
|
|
|
.set_tss_addr = vmx_set_tss_addr,
|
|
.get_tdp_level = get_ept_level,
|
|
.get_mt_mask_shift = vmx_get_mt_mask_shift,
|
|
};
|
|
|
|
static int __init vmx_init(void)
|
|
{
|
|
void *va;
|
|
int r;
|
|
|
|
vmx_io_bitmap_a = alloc_page(GFP_KERNEL | __GFP_HIGHMEM);
|
|
if (!vmx_io_bitmap_a)
|
|
return -ENOMEM;
|
|
|
|
vmx_io_bitmap_b = alloc_page(GFP_KERNEL | __GFP_HIGHMEM);
|
|
if (!vmx_io_bitmap_b) {
|
|
r = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
vmx_msr_bitmap = alloc_page(GFP_KERNEL | __GFP_HIGHMEM);
|
|
if (!vmx_msr_bitmap) {
|
|
r = -ENOMEM;
|
|
goto out1;
|
|
}
|
|
|
|
/*
|
|
* Allow direct access to the PC debug port (it is often used for I/O
|
|
* delays, but the vmexits simply slow things down).
|
|
*/
|
|
va = kmap(vmx_io_bitmap_a);
|
|
memset(va, 0xff, PAGE_SIZE);
|
|
clear_bit(0x80, va);
|
|
kunmap(vmx_io_bitmap_a);
|
|
|
|
va = kmap(vmx_io_bitmap_b);
|
|
memset(va, 0xff, PAGE_SIZE);
|
|
kunmap(vmx_io_bitmap_b);
|
|
|
|
va = kmap(vmx_msr_bitmap);
|
|
memset(va, 0xff, PAGE_SIZE);
|
|
kunmap(vmx_msr_bitmap);
|
|
|
|
set_bit(0, vmx_vpid_bitmap); /* 0 is reserved for host */
|
|
|
|
r = kvm_init(&vmx_x86_ops, sizeof(struct vcpu_vmx), THIS_MODULE);
|
|
if (r)
|
|
goto out2;
|
|
|
|
vmx_disable_intercept_for_msr(vmx_msr_bitmap, MSR_FS_BASE);
|
|
vmx_disable_intercept_for_msr(vmx_msr_bitmap, MSR_GS_BASE);
|
|
vmx_disable_intercept_for_msr(vmx_msr_bitmap, MSR_IA32_SYSENTER_CS);
|
|
vmx_disable_intercept_for_msr(vmx_msr_bitmap, MSR_IA32_SYSENTER_ESP);
|
|
vmx_disable_intercept_for_msr(vmx_msr_bitmap, MSR_IA32_SYSENTER_EIP);
|
|
|
|
if (vm_need_ept()) {
|
|
bypass_guest_pf = 0;
|
|
kvm_mmu_set_base_ptes(VMX_EPT_READABLE_MASK |
|
|
VMX_EPT_WRITABLE_MASK);
|
|
kvm_mmu_set_mask_ptes(0ull, 0ull, 0ull, 0ull,
|
|
VMX_EPT_EXECUTABLE_MASK,
|
|
VMX_EPT_DEFAULT_MT << VMX_EPT_MT_EPTE_SHIFT);
|
|
kvm_enable_tdp();
|
|
} else
|
|
kvm_disable_tdp();
|
|
|
|
if (bypass_guest_pf)
|
|
kvm_mmu_set_nonpresent_ptes(~0xffeull, 0ull);
|
|
|
|
ept_sync_global();
|
|
|
|
return 0;
|
|
|
|
out2:
|
|
__free_page(vmx_msr_bitmap);
|
|
out1:
|
|
__free_page(vmx_io_bitmap_b);
|
|
out:
|
|
__free_page(vmx_io_bitmap_a);
|
|
return r;
|
|
}
|
|
|
|
static void __exit vmx_exit(void)
|
|
{
|
|
__free_page(vmx_msr_bitmap);
|
|
__free_page(vmx_io_bitmap_b);
|
|
__free_page(vmx_io_bitmap_a);
|
|
|
|
kvm_exit();
|
|
}
|
|
|
|
module_init(vmx_init)
|
|
module_exit(vmx_exit)
|