mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-22 23:02:27 +07:00
6e2020977e
Now that VMREAD flows require a taken branch, courtesy of commit
3901336ed9 ("x86/kvm: Don't call kvm_spurious_fault() from .fixup")
bite the bullet and add full error handling to VMREAD, i.e. replace the
JMP added by __ex()/____kvm_handle_fault_on_reboot() with a hinted Jcc.
To minimize the code footprint, add a helper function, vmread_error(),
to handle both faults and failures so that the inline flow has a single
CALL.
Acked-by: Paolo Bonzini <pbonzini@redhat.com>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
306 lines
8.4 KiB
C
306 lines
8.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
#ifndef __KVM_X86_VMX_INSN_H
|
|
#define __KVM_X86_VMX_INSN_H
|
|
|
|
#include <linux/nospec.h>
|
|
|
|
#include <asm/kvm_host.h>
|
|
#include <asm/vmx.h>
|
|
|
|
#include "evmcs.h"
|
|
#include "vmcs.h"
|
|
|
|
#define __ex(x) __kvm_handle_fault_on_reboot(x)
|
|
|
|
asmlinkage void vmread_error(unsigned long field, bool fault);
|
|
void vmwrite_error(unsigned long field, unsigned long value);
|
|
void vmclear_error(struct vmcs *vmcs, u64 phys_addr);
|
|
void vmptrld_error(struct vmcs *vmcs, u64 phys_addr);
|
|
void invvpid_error(unsigned long ext, u16 vpid, gva_t gva);
|
|
void invept_error(unsigned long ext, u64 eptp, gpa_t gpa);
|
|
|
|
static __always_inline void vmcs_check16(unsigned long field)
|
|
{
|
|
BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6001) == 0x2000,
|
|
"16-bit accessor invalid for 64-bit field");
|
|
BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6001) == 0x2001,
|
|
"16-bit accessor invalid for 64-bit high field");
|
|
BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6000) == 0x4000,
|
|
"16-bit accessor invalid for 32-bit high field");
|
|
BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6000) == 0x6000,
|
|
"16-bit accessor invalid for natural width field");
|
|
}
|
|
|
|
static __always_inline void vmcs_check32(unsigned long field)
|
|
{
|
|
BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6000) == 0,
|
|
"32-bit accessor invalid for 16-bit field");
|
|
BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6000) == 0x6000,
|
|
"32-bit accessor invalid for natural width field");
|
|
}
|
|
|
|
static __always_inline void vmcs_check64(unsigned long field)
|
|
{
|
|
BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6000) == 0,
|
|
"64-bit accessor invalid for 16-bit field");
|
|
BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6001) == 0x2001,
|
|
"64-bit accessor invalid for 64-bit high field");
|
|
BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6000) == 0x4000,
|
|
"64-bit accessor invalid for 32-bit field");
|
|
BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6000) == 0x6000,
|
|
"64-bit accessor invalid for natural width field");
|
|
}
|
|
|
|
static __always_inline void vmcs_checkl(unsigned long field)
|
|
{
|
|
BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6000) == 0,
|
|
"Natural width accessor invalid for 16-bit field");
|
|
BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6001) == 0x2000,
|
|
"Natural width accessor invalid for 64-bit field");
|
|
BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6001) == 0x2001,
|
|
"Natural width accessor invalid for 64-bit high field");
|
|
BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6000) == 0x4000,
|
|
"Natural width accessor invalid for 32-bit field");
|
|
}
|
|
|
|
static __always_inline unsigned long __vmcs_readl(unsigned long field)
|
|
{
|
|
unsigned long value;
|
|
|
|
asm volatile("1: vmread %2, %1\n\t"
|
|
".byte 0x3e\n\t" /* branch taken hint */
|
|
"ja 3f\n\t"
|
|
"mov %2, %%" _ASM_ARG1 "\n\t"
|
|
"xor %%" _ASM_ARG2 ", %%" _ASM_ARG2 "\n\t"
|
|
"2: call vmread_error\n\t"
|
|
"xor %k1, %k1\n\t"
|
|
"3:\n\t"
|
|
|
|
".pushsection .fixup, \"ax\"\n\t"
|
|
"4: mov %2, %%" _ASM_ARG1 "\n\t"
|
|
"mov $1, %%" _ASM_ARG2 "\n\t"
|
|
"jmp 2b\n\t"
|
|
".popsection\n\t"
|
|
_ASM_EXTABLE(1b, 4b)
|
|
: ASM_CALL_CONSTRAINT, "=r"(value) : "r"(field) : "cc");
|
|
return value;
|
|
}
|
|
|
|
static __always_inline u16 vmcs_read16(unsigned long field)
|
|
{
|
|
vmcs_check16(field);
|
|
if (static_branch_unlikely(&enable_evmcs))
|
|
return evmcs_read16(field);
|
|
return __vmcs_readl(field);
|
|
}
|
|
|
|
static __always_inline u32 vmcs_read32(unsigned long field)
|
|
{
|
|
vmcs_check32(field);
|
|
if (static_branch_unlikely(&enable_evmcs))
|
|
return evmcs_read32(field);
|
|
return __vmcs_readl(field);
|
|
}
|
|
|
|
static __always_inline u64 vmcs_read64(unsigned long field)
|
|
{
|
|
vmcs_check64(field);
|
|
if (static_branch_unlikely(&enable_evmcs))
|
|
return evmcs_read64(field);
|
|
#ifdef CONFIG_X86_64
|
|
return __vmcs_readl(field);
|
|
#else
|
|
return __vmcs_readl(field) | ((u64)__vmcs_readl(field+1) << 32);
|
|
#endif
|
|
}
|
|
|
|
static __always_inline unsigned long vmcs_readl(unsigned long field)
|
|
{
|
|
vmcs_checkl(field);
|
|
if (static_branch_unlikely(&enable_evmcs))
|
|
return evmcs_read64(field);
|
|
return __vmcs_readl(field);
|
|
}
|
|
|
|
#define vmx_asm1(insn, op1, error_args...) \
|
|
do { \
|
|
asm_volatile_goto("1: " __stringify(insn) " %0\n\t" \
|
|
".byte 0x2e\n\t" /* branch not taken hint */ \
|
|
"jna %l[error]\n\t" \
|
|
_ASM_EXTABLE(1b, %l[fault]) \
|
|
: : op1 : "cc" : error, fault); \
|
|
return; \
|
|
error: \
|
|
insn##_error(error_args); \
|
|
return; \
|
|
fault: \
|
|
kvm_spurious_fault(); \
|
|
} while (0)
|
|
|
|
#define vmx_asm2(insn, op1, op2, error_args...) \
|
|
do { \
|
|
asm_volatile_goto("1: " __stringify(insn) " %1, %0\n\t" \
|
|
".byte 0x2e\n\t" /* branch not taken hint */ \
|
|
"jna %l[error]\n\t" \
|
|
_ASM_EXTABLE(1b, %l[fault]) \
|
|
: : op1, op2 : "cc" : error, fault); \
|
|
return; \
|
|
error: \
|
|
insn##_error(error_args); \
|
|
return; \
|
|
fault: \
|
|
kvm_spurious_fault(); \
|
|
} while (0)
|
|
|
|
static __always_inline void __vmcs_writel(unsigned long field, unsigned long value)
|
|
{
|
|
vmx_asm2(vmwrite, "r"(field), "rm"(value), field, value);
|
|
}
|
|
|
|
static __always_inline void vmcs_write16(unsigned long field, u16 value)
|
|
{
|
|
vmcs_check16(field);
|
|
if (static_branch_unlikely(&enable_evmcs))
|
|
return evmcs_write16(field, value);
|
|
|
|
__vmcs_writel(field, value);
|
|
}
|
|
|
|
static __always_inline void vmcs_write32(unsigned long field, u32 value)
|
|
{
|
|
vmcs_check32(field);
|
|
if (static_branch_unlikely(&enable_evmcs))
|
|
return evmcs_write32(field, value);
|
|
|
|
__vmcs_writel(field, value);
|
|
}
|
|
|
|
static __always_inline void vmcs_write64(unsigned long field, u64 value)
|
|
{
|
|
vmcs_check64(field);
|
|
if (static_branch_unlikely(&enable_evmcs))
|
|
return evmcs_write64(field, value);
|
|
|
|
__vmcs_writel(field, value);
|
|
#ifndef CONFIG_X86_64
|
|
__vmcs_writel(field+1, value >> 32);
|
|
#endif
|
|
}
|
|
|
|
static __always_inline void vmcs_writel(unsigned long field, unsigned long value)
|
|
{
|
|
vmcs_checkl(field);
|
|
if (static_branch_unlikely(&enable_evmcs))
|
|
return evmcs_write64(field, value);
|
|
|
|
__vmcs_writel(field, value);
|
|
}
|
|
|
|
static __always_inline void vmcs_clear_bits(unsigned long field, u32 mask)
|
|
{
|
|
BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6000) == 0x2000,
|
|
"vmcs_clear_bits does not support 64-bit fields");
|
|
if (static_branch_unlikely(&enable_evmcs))
|
|
return evmcs_write32(field, evmcs_read32(field) & ~mask);
|
|
|
|
__vmcs_writel(field, __vmcs_readl(field) & ~mask);
|
|
}
|
|
|
|
static __always_inline void vmcs_set_bits(unsigned long field, u32 mask)
|
|
{
|
|
BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6000) == 0x2000,
|
|
"vmcs_set_bits does not support 64-bit fields");
|
|
if (static_branch_unlikely(&enable_evmcs))
|
|
return evmcs_write32(field, evmcs_read32(field) | mask);
|
|
|
|
__vmcs_writel(field, __vmcs_readl(field) | mask);
|
|
}
|
|
|
|
static inline void vmcs_clear(struct vmcs *vmcs)
|
|
{
|
|
u64 phys_addr = __pa(vmcs);
|
|
|
|
vmx_asm1(vmclear, "m"(phys_addr), vmcs, phys_addr);
|
|
}
|
|
|
|
static inline void vmcs_load(struct vmcs *vmcs)
|
|
{
|
|
u64 phys_addr = __pa(vmcs);
|
|
|
|
if (static_branch_unlikely(&enable_evmcs))
|
|
return evmcs_load(phys_addr);
|
|
|
|
vmx_asm1(vmptrld, "m"(phys_addr), vmcs, phys_addr);
|
|
}
|
|
|
|
static inline void __invvpid(unsigned long ext, u16 vpid, gva_t gva)
|
|
{
|
|
struct {
|
|
u64 vpid : 16;
|
|
u64 rsvd : 48;
|
|
u64 gva;
|
|
} operand = { vpid, 0, gva };
|
|
|
|
vmx_asm2(invvpid, "r"(ext), "m"(operand), ext, vpid, gva);
|
|
}
|
|
|
|
static inline void __invept(unsigned long ext, u64 eptp, gpa_t gpa)
|
|
{
|
|
struct {
|
|
u64 eptp, gpa;
|
|
} operand = {eptp, gpa};
|
|
|
|
vmx_asm2(invept, "r"(ext), "m"(operand), ext, eptp, gpa);
|
|
}
|
|
|
|
static inline bool vpid_sync_vcpu_addr(int vpid, gva_t addr)
|
|
{
|
|
if (vpid == 0)
|
|
return true;
|
|
|
|
if (cpu_has_vmx_invvpid_individual_addr()) {
|
|
__invvpid(VMX_VPID_EXTENT_INDIVIDUAL_ADDR, vpid, addr);
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
static inline void vpid_sync_vcpu_single(int vpid)
|
|
{
|
|
if (vpid == 0)
|
|
return;
|
|
|
|
if (cpu_has_vmx_invvpid_single())
|
|
__invvpid(VMX_VPID_EXTENT_SINGLE_CONTEXT, vpid, 0);
|
|
}
|
|
|
|
static inline void vpid_sync_vcpu_global(void)
|
|
{
|
|
if (cpu_has_vmx_invvpid_global())
|
|
__invvpid(VMX_VPID_EXTENT_ALL_CONTEXT, 0, 0);
|
|
}
|
|
|
|
static inline void vpid_sync_context(int vpid)
|
|
{
|
|
if (cpu_has_vmx_invvpid_single())
|
|
vpid_sync_vcpu_single(vpid);
|
|
else
|
|
vpid_sync_vcpu_global();
|
|
}
|
|
|
|
static inline void ept_sync_global(void)
|
|
{
|
|
__invept(VMX_EPT_EXTENT_GLOBAL, 0, 0);
|
|
}
|
|
|
|
static inline void ept_sync_context(u64 eptp)
|
|
{
|
|
if (cpu_has_vmx_invept_context())
|
|
__invept(VMX_EPT_EXTENT_CONTEXT, eptp, 0);
|
|
else
|
|
ept_sync_global();
|
|
}
|
|
|
|
#endif /* __KVM_X86_VMX_INSN_H */
|