linux-kernel - [PATCH 2/2] x86/cpufeatures: Add macros for Intel's new fast rep string features

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Date:   Thu,  3 Feb 2022 11:43:08 -0800
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>, x86@...nel.org,
        "H. Peter Anvin" <hpa@...or.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Tony Luck <tony.luck@...el.com>,
        Peter Zijlstra <peterz@...radead.org>,
        "Chang S. Bae" <chang.seok.bae@...el.com>,
        Jim Mattson <jmattson@...gle.com>,
        Juergen Gross <jgross@...e.com>,
        Andrew Cooper <andrew.cooper3@...rix.com>,
        Babu Moger <babu.moger@....com>,
        Jing Liu <jing2.liu@...el.com>,
        Sean Christopherson <seanjc@...gle.com>,
        linux-kernel@...r.kernel.org
Subject: [PATCH 2/2] x86/cpufeatures: Add macros for Intel's new fast rep
 string features

Even if no one else cares, these features should be exposed to kvm
guests, and the code for the KVM_GET_SUPPORTED_CPUID ioctl is more
readable if the bits have corresponding X86_FEATURE macros.

Signed-off-by: Jim Mattson <jmattson@...gle.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 d7b51ddc8db3..138a50bc7bbd 100644
--- a/arch/x86/include/asm/cpufeatures.h
+++ b/arch/x86/include/asm/cpufeatures.h
@@ -299,6 +299,9 @@
 /* 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 */
-- 
2.35.0.263.gb82422642f-goog