linux-kernel - [PATCH v3 2/2] KVM: x86: Expose CPUID.(EAX=7,ECX=1).EAX[12:10] to the guest

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Message-ID: <20220901211811.2883855-2-jmattson@google.com>
Date:   Thu,  1 Sep 2022 14:18:07 -0700
From:   Jim Mattson <jmattson@...gle.com>
To:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        "maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)" <x86@...nel.org>,
        "H. Peter Anvin" <hpa@...or.com>,
        Sean Christopherson <seanjc@...gle.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Josh Poimboeuf <jpoimboe@...nel.org>,
        Pawan Gupta <pawan.kumar.gupta@...ux.intel.com>,
        "Chang S. Bae" <chang.seok.bae@...el.com>,
        Jim Mattson <jmattson@...gle.com>,
        Babu Moger <babu.moger@....com>,
        Wyes Karny <wyes.karny@....com>,
        "open list:X86 ARCHITECTURE (32-BIT AND 64-BIT)" 
        <linux-kernel@...r.kernel.org>,
        "open list:KERNEL VIRTUAL MACHINE FOR X86 (KVM/x86)" 
        <kvm@...r.kernel.org>
Subject: [PATCH v3 2/2] KVM: x86: Expose CPUID.(EAX=7,ECX=1).EAX[12:10] to the guest

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@...gle.com>
---
 arch/x86/kvm/cpuid.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c
index 75dcf7a72605..172cbfd60946 100644
--- a/arch/x86/kvm/cpuid.c
+++ b/arch/x86/kvm/cpuid.c
@@ -636,7 +636,7 @@ 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(AVX_VNNI) | F(AVX512_BF16) | F(FZRM) | F(FSRS) | F(FSRC)
 	);
 
 	kvm_cpu_cap_mask(CPUID_D_1_EAX,
-- 
2.37.2.789.g6183377224-goog