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>,
Jim Mattson <jmattson@google.com>,
Babu Moger <babu.moger@amd.com>,
"Chang S. Bae" <chang.seok.bae@intel.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 1/2] x86/cpufeatures: Add macros for Intel's new fast rep string features
Date: Thu, 1 Sep 2022 14:18:06 -0700 [thread overview]
Message-ID: <20220901211811.2883855-1-jmattson@google.com> (raw)
KVM_GET_SUPPORTED_CPUID should reflect these host CPUID bits. The bits
are already cached in word 12. Give the bits X86_FEATURE names, so
that they can be easily referenced. Hide these bits from
/proc/cpuinfo, since the host kernel makes no use of them at present.
Signed-off-by: Jim Mattson <jmattson@google.com>
---
arch/x86/include/asm/cpufeatures.h | 3 +++
1 file changed, 3 insertions(+)
diff --git a/arch/x86/include/asm/cpufeatures.h b/arch/x86/include/asm/cpufeatures.h
index ef4775c6db01..454f0faa8e90 100644
--- a/arch/x86/include/asm/cpufeatures.h
+++ b/arch/x86/include/asm/cpufeatures.h
@@ -308,6 +308,9 @@
/* Intel-defined CPU features, CPUID level 0x00000007:1 (EAX), word 12 */
#define X86_FEATURE_AVX_VNNI (12*32+ 4) /* AVX VNNI instructions */
#define X86_FEATURE_AVX512_BF16 (12*32+ 5) /* AVX512 BFLOAT16 instructions */
+#define X86_FEATURE_FZRM (12*32+10) /* "" Fast zero-length REP MOVSB */
+#define X86_FEATURE_FSRS (12*32+11) /* "" Fast short REP STOSB */
+#define X86_FEATURE_FSRC (12*32+12) /* "" Fast short REP {CMPSB,SCASB} */
/* AMD-defined CPU features, CPUID level 0x80000008 (EBX), word 13 */
#define X86_FEATURE_CLZERO (13*32+ 0) /* CLZERO instruction */
--
2.37.2.789.g6183377224-goog
next 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 Jim Mattson [this message]
2022-09-01 21:18 ` [PATCH v3 2/2] KVM: x86: Expose CPUID.(EAX=7,ECX=1).EAX[12:10] to the guest Jim Mattson
2022-10-07 1:45 ` 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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