linux-kernel - [PATCH v7 06/21] x86/cpufeatures: Enumerate MSR_IA32_CORE

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Message-Id: <1555536851-17462-7-git-send-email-fenghua.yu@intel.com>
Date:   Wed, 17 Apr 2019 14:33:56 -0700
From:   Fenghua Yu <fenghua.yu@...el.com>
To:     "Thomas Gleixner" <tglx@...utronix.de>,
        "Ingo Molnar" <mingo@...hat.com>, "Borislav Petkov" <bp@...en8.de>,
        "H Peter Anvin" <hpa@...or.com>,
        "Paolo Bonzini" <pbonzini@...hat.com>,
        "Dave Hansen" <dave.hansen@...el.com>,
        "Ashok Raj" <ashok.raj@...el.com>,
        "Peter Zijlstra" <peterz@...radead.org>,
        "Ravi V Shankar" <ravi.v.shankar@...el.com>,
        "Xiaoyao Li " <xiaoyao.li@...el.com>,
        "Christopherson Sean J" <sean.j.christopherson@...el.com>,
        "Kalle Valo" <kvalo@...eaurora.org>,
        "Michael Chan" <michael.chan@...adcom.com>
Cc:     "linux-kernel" <linux-kernel@...r.kernel.org>,
        "x86" <x86@...nel.org>, kvm@...r.kernel.org,
        netdev@...r.kernel.org, linux-wireless@...r.kernel.org,
        Fenghua Yu <fenghua.yu@...el.com>
Subject: [PATCH v7 06/21] x86/cpufeatures: Enumerate MSR_IA32_CORE_CAPABILITY

MSR_IA32_CORE_CAPABILITY (0xcf) contains bits that enumerate some model
specific features.

The MSR 0xcf itself is enumerated by CPUID.(EAX=0x7,ECX=0):EDX[30].
When this CPUID bit is 1, the MSR 0xcf exists.

Detailed information on the CPUID bit and the MSR can be found in the
latest Intel 64 and IA-32 Architectures Software Developer's Manual.

Signed-off-by: Fenghua Yu <fenghua.yu@...el.com>
---
 arch/x86/include/asm/cpufeatures.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/x86/include/asm/cpufeatures.h b/arch/x86/include/asm/cpufeatures.h
index 981ff9479648..eff25e2015a5 100644
--- a/arch/x86/include/asm/cpufeatures.h
+++ b/arch/x86/include/asm/cpufeatures.h
@@ -350,6 +350,7 @@
 #define X86_FEATURE_INTEL_STIBP		(18*32+27) /* "" Single Thread Indirect Branch Predictors */
 #define X86_FEATURE_FLUSH_L1D		(18*32+28) /* Flush L1D cache */
 #define X86_FEATURE_ARCH_CAPABILITIES	(18*32+29) /* IA32_ARCH_CAPABILITIES MSR (Intel) */
+#define X86_FEATURE_CORE_CAPABILITY	(18*32+30) /* "" IA32_CORE_CAPABILITY MSR */
 #define X86_FEATURE_SPEC_CTRL_SSBD	(18*32+31) /* "" Speculative Store Bypass Disable */
 
 /*
-- 
2.19.1