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| author | Paolo Bonzini <pbonzini@redhat.com> | 2020-08-09 13:04:56 -0400 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2020-08-09 13:08:54 -0400 |
| commit | 43bd9ef42b3b862c97f1f4e86bf3ace890bef924 (patch) | |
| tree | 33ebc7e27d4e0ebce65b8bdb4069f11e4b31bd11 /arch/x86/kvm/cpuid.c | |
| parent | 0378daef0c6cf1c2ba525bde0b529f0d4ef5233b (diff) | |
| download | lwn-43bd9ef42b3b862c97f1f4e86bf3ace890bef924.tar.gz lwn-43bd9ef42b3b862c97f1f4e86bf3ace890bef924.zip | |
x86: Expose SERIALIZE for supported cpuid
The SERIALIZE instruction is supported by Tntel processors, like
Sapphire Rapids. SERIALIZE is a faster serializing instruction which
does not modify registers, arithmetic flags or memory, will not cause VM
exit. It's availability is indicated by CPUID.(EAX=7,ECX=0):ECX[bit 14].
Expose it in KVM supported CPUID. This way, KVM could pass this
information to guests and they can make use of these features accordingly.
Signed-off-by: Cathy Zhang <cathy.zhang@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/x86/kvm/cpuid.c')
| -rw-r--r-- | arch/x86/kvm/cpuid.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c index fa873e3e6e90..3fd6eec202d7 100644 --- a/arch/x86/kvm/cpuid.c +++ b/arch/x86/kvm/cpuid.c @@ -370,7 +370,8 @@ void kvm_set_cpu_caps(void) kvm_cpu_cap_mask(CPUID_7_EDX, F(AVX512_4VNNIW) | F(AVX512_4FMAPS) | F(SPEC_CTRL) | F(SPEC_CTRL_SSBD) | F(ARCH_CAPABILITIES) | F(INTEL_STIBP) | - F(MD_CLEAR) | F(AVX512_VP2INTERSECT) | F(FSRM) + F(MD_CLEAR) | F(AVX512_VP2INTERSECT) | F(FSRM) | + F(SERIALIZE) ); /* TSC_ADJUST and ARCH_CAPABILITIES are emulated in software. */ |