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KVM: x86: Advertise fast REP string features inherent to the CPU

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Fast zero-length REP MOVSB, fast short REP STOSB, and fast short REP
{CMPSB,SCASB} are inherent features of the processor that cannot be
hidden by the hypervisor. When these features are present on the host,
enumerate them in KVM_GET_SUPPORTED_CPUID.

Signed-off-by: Jim Mattson <jmattson@google.com>
Reviewed-by: Sean Christopherson <seanjc@google.com>
Link: https://lore.kernel.org/r/20220901211811.2883855-2-jmattson@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
This commit is contained in:
Jim Mattson 2022-09-01 14:18:07 -07:00 committed by Sean Christopherson
parent f8df91e73a
commit 2a4209d6a9
1 changed files with 3 additions and 2 deletions
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5
arch/x86/kvm/cpuid.c
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@ -664,8 +664,9 @@ void kvm_set_cpu_caps(void)
kvm_cpu_cap_set(X86_FEATURE_SPEC_CTRL_SSBD);
kvm_cpu_cap_mask(CPUID_7_1_EAX,
F(AVX_VNNI) | F(AVX512_BF16) | F(CMPCCXADD) | F(AMX_FP16) |
F(AVX_IFMA)
F(AVX_VNNI) | F(AVX512_BF16) | F(CMPCCXADD) |
F(FZRM) | F(FSRS) | F(FSRC) |
F(AMX_FP16) | F(AVX_IFMA)
);
kvm_cpu_cap_init_kvm_defined(CPUID_7_1_EDX,