diff options
| author | Sean Christopherson <seanjc@google.com> | 2024-01-10 00:02:48 +0100 |
|---|---|---|
| committer | Sean Christopherson <seanjc@google.com> | 2024-01-31 00:29:45 +0100 |
| commit | b5e66df34cb0de716859595ce7a4d9d1d015a695 (patch) | |
| tree | 303e146b238ab7f4f097fc9d5bc0b070b79f6e7a /tools/testing | |
| parent | KVM: selftests: Add a forced emulation variation of KVM_ASM_SAFE() (diff) | |
| download | linux-b5e66df34cb0de716859595ce7a4d9d1d015a695.tar.xz linux-b5e66df34cb0de716859595ce7a4d9d1d015a695.zip | |
KVM: selftests: Add helpers for safe and safe+forced RDMSR, RDPMC, and XGETBV
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>
Diffstat (limited to 'tools/testing')
| -rw-r--r-- | tools/testing/selftests/kvm/include/x86_64/processor.h | 38 |
1 files changed, 26 insertions, 12 deletions
diff --git a/tools/testing/selftests/kvm/include/x86_64/processor.h b/tools/testing/selftests/kvm/include/x86_64/processor.h index fe891424ff55..abac816f6594 100644 --- a/tools/testing/selftests/kvm/include/x86_64/processor.h +++ b/tools/testing/selftests/kvm/include/x86_64/processor.h @@ -1216,20 +1216,34 @@ 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; +#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; \ +} - asm volatile(KVM_ASM_SAFE("rdmsr") - : "=a"(a), "=d"(d), KVM_ASM_SAFE_OUTPUTS(vector, error_code) - : "c"(msr) - : KVM_ASM_SAFE_CLOBBERS); +/* + * 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) \ - *val = (uint64_t)a | ((uint64_t)d << 32); - return vector; -} +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) { |