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Fri, 29 Jan 2021 00:43:24 +0000 Subject: [PATCH v4 1/2] x86/cpufeatures: Add the Virtual SPEC_CTRL feature From: Babu Moger To: pbonzini@redhat.com, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de Cc: fenghua.yu@intel.com, tony.luck@intel.com, wanpengli@tencent.com, kvm@vger.kernel.org, thomas.lendacky@amd.com, peterz@infradead.org, seanjc@google.com, joro@8bytes.org, x86@kernel.org, kyung.min.park@intel.com, linux-kernel@vger.kernel.org, krish.sadhukhan@oracle.com, hpa@zytor.com, mgross@linux.intel.com, vkuznets@redhat.com, kim.phillips@amd.com, wei.huang2@amd.com, jmattson@google.com Date: Thu, 28 Jan 2021 18:43:22 -0600 Message-ID: <161188100272.28787.4097272856384825024.stgit@bmoger-ubuntu> In-Reply-To: <161188083424.28787.9510741752032213167.stgit@bmoger-ubuntu> References: <161188083424.28787.9510741752032213167.stgit@bmoger-ubuntu> User-Agent: StGit/0.17.1-dirty Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit X-Originating-IP: [165.204.77.1] X-ClientProxiedBy: SA9PR13CA0236.namprd13.prod.outlook.com (2603:10b6:806:25::31) To SN1PR12MB2560.namprd12.prod.outlook.com (2603:10b6:802:26::19) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from [127.0.1.1] (165.204.77.1) by SA9PR13CA0236.namprd13.prod.outlook.com (2603:10b6:806:25::31) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3825.8 via Frontend Transport; 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Presence of this feature is indicated via CPUID function 0x8000000A_EDX[20]: GuestSpecCtrl. When present, the SPEC_CTRL MSR is automatically virtualized. Signed-off-by: Babu Moger Acked-by: Borislav Petkov --- 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 84b887825f12..3fcd0624b1bc 100644 --- a/arch/x86/include/asm/cpufeatures.h +++ b/arch/x86/include/asm/cpufeatures.h @@ -337,6 +337,7 @@ #define X86_FEATURE_AVIC (15*32+13) /* Virtual Interrupt Controller */ #define X86_FEATURE_V_VMSAVE_VMLOAD (15*32+15) /* Virtual VMSAVE VMLOAD */ #define X86_FEATURE_VGIF (15*32+16) /* Virtual GIF */ +#define X86_FEATURE_V_SPEC_CTRL (15*32+20) /* Virtual SPEC_CTRL */ /* Intel-defined CPU features, CPUID level 0x00000007:0 (ECX), word 16 */ #define X86_FEATURE_AVX512VBMI (16*32+ 1) /* AVX512 Vector Bit Manipulation instructions*/