TWxSoftware/twx-linux
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

KVM: selftests: Add helpers for safe and safe+forced RDMSR, RDPMC, and XGETBV

Browse Source 
Add helpers for safe and safe-with-forced-emulations versions of RDMSR,
RDPMC, and XGETBV.  Use macro shenanigans to eliminate the rather large
amount of boilerplate needed to get values in and out of registers.

Tested-by: Dapeng Mi <dapeng1.mi@linux.intel.com>
Link: https://lore.kernel.org/r/20240109230250.424295-29-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
This commit is contained in:
Sean Christopherson
2024-01-09 15:02:48 -08:00
parent ab3b6a7de8
commit b5e66df34c
1 changed files with 27 additions and 13 deletions
Download Patch File Download Diff File Expand all files Collapse all files
tools/testing/selftests/kvm/include/x86_64/processor.h
+27 -13
View File
@@ -1216,21 +1216,35 @@ void vm_install_exception_handler(struct kvm_vm *vm, int vector,
vector; \
})
static inline uint8_t rdmsr_safe(uint32_t msr, uint64_t *val)
{
uint64_t error_code;
uint8_t vector;
uint32_t a, d;
asm volatile(KVM_ASM_SAFE("rdmsr")
: "=a"(a), "=d"(d), KVM_ASM_SAFE_OUTPUTS(vector, error_code)
: "c"(msr)
: KVM_ASM_SAFE_CLOBBERS);
*val = (uint64_t)a | ((uint64_t)d << 32);
return vector;
#define BUILD_READ_U64_SAFE_HELPER(insn, _fep, _FEP) \
static inline uint8_t insn##_safe ##_fep(uint32_t idx, uint64_t *val) \
{ \
uint64_t error_code; \
uint8_t vector; \
uint32_t a, d; \
\
asm volatile(KVM_ASM_SAFE##_FEP(#insn) \
: "=a"(a), "=d"(d), \
KVM_ASM_SAFE_OUTPUTS(vector, error_code) \
: "c"(idx) \
: KVM_ASM_SAFE_CLOBBERS); \
\
*val = (uint64_t)a | ((uint64_t)d << 32); \
return vector; \
}
/*
* Generate {insn}_safe() and {insn}_safe_fep() helpers for instructions that
* use ECX as in input index, and EDX:EAX as a 64-bit output.
*/
#define BUILD_READ_U64_SAFE_HELPERS(insn) \
BUILD_READ_U64_SAFE_HELPER(insn, , ) \
BUILD_READ_U64_SAFE_HELPER(insn, _fep, _FEP) \
BUILD_READ_U64_SAFE_HELPERS(rdmsr)
BUILD_READ_U64_SAFE_HELPERS(rdpmc)
BUILD_READ_U64_SAFE_HELPERS(xgetbv)
static inline uint8_t wrmsr_safe(uint32_t msr, uint64_t val)
{
return kvm_asm_safe("wrmsr", "a"(val & -1u), "d"(val >> 32), "c"(msr));