From: Paolo Bonzini <pbonzini@redhat.com>
Date: Sun, 9 Aug 2020 13:04:56 -0400
Subject: x86: Expose SERIALIZE for supported cpuid
Git-commit: 43bd9ef42b3b862c97f1f4e86bf3ace890bef924
Patch-mainline: v5.9-rc1
References: jsc#SLE-13557

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>
Acked-by: Borislav Petkov <bp@suse.de>
---
 arch/x86/kvm/cpuid.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/arch/x86/kvm/cpuid.c
+++ b/arch/x86/kvm/cpuid.c
@@ -373,7 +373,7 @@ static inline void do_cpuid_7_mask(struc
 	const u32 kvm_cpuid_7_0_edx_x86_features =
 		F(AVX512_4VNNIW) | F(AVX512_4FMAPS) | F(SPEC_CTRL) |
 		F(SPEC_CTRL_SSBD) | F(ARCH_CAPABILITIES) | F(INTEL_STIBP) |
-		F(MD_CLEAR);
+		F(MD_CLEAR) | F(SERIALIZE);
 
 	/* cpuid 7.1.eax */
 	const u32 kvm_cpuid_7_1_eax_x86_features =