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[v5,1/4] x86/cpufeatures: Add SNP Secure TSC

Message ID 20250317052308.498244-2-nikunj@amd.com (mailing list archive)
State New
Headers show
Series Enable Secure TSC for SEV-SNP | expand

Commit Message

Nikunj A Dadhania March 17, 2025, 5:23 a.m. UTC 
The Secure TSC feature for SEV-SNP allows guests to securely use the RDTSC
and RDTSCP instructions, ensuring that the parameters used cannot be
altered by the hypervisor once the guest is launched. For more details,
refer to the AMD64 APM Vol 2, Section "Secure TSC".

Signed-off-by: Nikunj A Dadhania <nikunj@amd.com>
Acked-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Tom Lendacky <thomas.lendacky@amd.com>
---
 arch/x86/include/asm/cpufeatures.h | 1 +
 1 file changed, 1 insertion(+)
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Patch

diff --git a/arch/x86/include/asm/cpufeatures.h b/arch/x86/include/asm/cpufeatures.h
index 508c0dad116b..921ed26b0be7 100644
--- a/arch/x86/include/asm/cpufeatures.h
+++ b/arch/x86/include/asm/cpufeatures.h
@@ -448,6 +448,7 @@ 
 #define X86_FEATURE_VM_PAGE_FLUSH	(19*32+ 2) /* VM Page Flush MSR is supported */
 #define X86_FEATURE_SEV_ES		(19*32+ 3) /* "sev_es" Secure Encrypted Virtualization - Encrypted State */
 #define X86_FEATURE_SEV_SNP		(19*32+ 4) /* "sev_snp" Secure Encrypted Virtualization - Secure Nested Paging */
+#define X86_FEATURE_SNP_SECURE_TSC	(19*32+ 8) /* SEV-SNP Secure TSC */
 #define X86_FEATURE_V_TSC_AUX		(19*32+ 9) /* Virtual TSC_AUX */
 #define X86_FEATURE_SME_COHERENT	(19*32+10) /* hardware-enforced cache coherency */
 #define X86_FEATURE_DEBUG_SWAP		(19*32+14) /* "debug_swap" SEV-ES full debug state swap support */