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authorPaolo Bonzini <pbonzini@redhat.com>2020-08-09 13:04:56 -0400
committerPaolo Bonzini <pbonzini@redhat.com>2020-08-09 13:08:54 -0400
commit43bd9ef42b3b862c97f1f4e86bf3ace890bef924 (patch)
tree33ebc7e27d4e0ebce65b8bdb4069f11e4b31bd11 /arch
parent0378daef0c6cf1c2ba525bde0b529f0d4ef5233b (diff)
downloadlinux-43bd9ef42b3b862c97f1f4e86bf3ace890bef924.tar.bz2
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')
-rw-r--r--arch/x86/kvm/cpuid.c3
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. */