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Message-ID: <20240215113128.275608-10-nikunj@amd.com>
Date: Thu, 15 Feb 2024 17:01:21 +0530
From: Nikunj A Dadhania <nikunj@....com>
To: <linux-kernel@...r.kernel.org>, <thomas.lendacky@....com>, <bp@...en8.de>,
<x86@...nel.org>, <kvm@...r.kernel.org>
CC: <mingo@...hat.com>, <tglx@...utronix.de>, <dave.hansen@...ux.intel.com>,
<pgonda@...gle.com>, <seanjc@...gle.com>, <pbonzini@...hat.com>,
<nikunj@....com>
Subject: [PATCH v8 09/16] x86/cpufeatures: Add synthetic Secure TSC bit
Add support for the synthetic CPUID flag which indicates that the SNP
guest is running with secure tsc enabled (MSR_AMD64_SEV Bit 11 -
SecureTsc_Enabled) . This flag is there so that this capability in the
guests can be detected easily without reading MSRs every time accessors.
Suggested-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
Signed-off-by: Nikunj A Dadhania <nikunj@....com>
Tested-by: Peter Gonda <pgonda@...gle.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 0fa702673e73..24ac7fe97806 100644
--- a/arch/x86/include/asm/cpufeatures.h
+++ b/arch/x86/include/asm/cpufeatures.h
@@ -236,6 +236,7 @@
#define X86_FEATURE_PVUNLOCK ( 8*32+20) /* "" PV unlock function */
#define X86_FEATURE_VCPUPREEMPT ( 8*32+21) /* "" PV vcpu_is_preempted function */
#define X86_FEATURE_TDX_GUEST ( 8*32+22) /* Intel Trust Domain Extensions Guest */
+#define X86_FEATURE_SNP_SECURE_TSC ( 8*32+23) /* "" AMD SNP Secure TSC */
/* Intel-defined CPU features, CPUID level 0x00000007:0 (EBX), word 9 */
#define X86_FEATURE_FSGSBASE ( 9*32+ 0) /* RDFSBASE, WRFSBASE, RDGSBASE, WRGSBASE instructions*/
--
2.34.1
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