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>

diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c
index fa873e3e6e90e601c23e03b8c16effece08ac217..3fd6eec202d7a63e5e16540e3be94d795defcb1c 100644 (file)
--- 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. */