From: Jim Mattson <jmattson@google.com>
To: Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
Dave Hansen <dave.hansen@linux.intel.com>,
"maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)"
<x86@kernel.org>, "H. Peter Anvin" <hpa@zytor.com>,
Sean Christopherson <seanjc@google.com>,
Paolo Bonzini <pbonzini@redhat.com>,
Peter Zijlstra <peterz@infradead.org>,
Josh Poimboeuf <jpoimboe@kernel.org>,
Pawan Gupta <pawan.kumar.gupta@linux.intel.com>,
"Chang S. Bae" <chang.seok.bae@intel.com>,
Jim Mattson <jmattson@google.com>,
Babu Moger <babu.moger@amd.com>, Wyes Karny <wyes.karny@amd.com>,
"open list:X86 ARCHITECTURE (32-BIT AND 64-BIT)"
<linux-kernel@vger.kernel.org>,
"open list:KERNEL VIRTUAL MACHINE FOR X86 (KVM/x86)"
<kvm@vger.kernel.org>
Subject: [PATCH v3 2/2] KVM: x86: Expose CPUID.(EAX=7,ECX=1).EAX[12:10] to the guest
Date: Thu, 1 Sep 2022 14:18:07 -0700 [thread overview]
Message-ID: <20220901211811.2883855-2-jmattson@google.com> (raw)
In-Reply-To: <20220901211811.2883855-1-jmattson@google.com>
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@google.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
next prev parent reply other threads:[~2022-09-01 21:18 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-09-01 21:18 [PATCH v3 1/2] x86/cpufeatures: Add macros for Intel's new fast rep string features Jim Mattson
2022-09-01 21:18 ` Jim Mattson [this message]
2022-10-07 1:45 ` [PATCH v3 2/2] KVM: x86: Expose CPUID.(EAX=7,ECX=1).EAX[12:10] to the guest Sean Christopherson
2022-09-02 4:14 ` [PATCH v3 1/2] x86/cpufeatures: Add macros for Intel's new fast rep string features H. Peter Anvin
2022-09-02 5:48 ` Borislav Petkov
2022-10-07 1:46 ` Sean Christopherson
2023-01-19 20:48 ` Sean Christopherson
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