From: Kishon Vijay Abraham I Date: Mon, 10 Mar 2025 20:16:02 +0000 (-0500) Subject: x86/cpufeatures: Add "Allowed SEV Features" Feature X-Git-Tag: v6.16-rc1~78^2~4^2~9 X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=f9f27c4a377a8b45;p=thirdparty%2Flinux.git x86/cpufeatures: Add "Allowed SEV Features" Feature Add CPU feature detection for "Allowed SEV Features" to allow the Hypervisor to enforce that SEV-ES and SEV-SNP guest VMs cannot enable features (via SEV_FEATURES) that the Hypervisor does not support or wish to be enabled. Signed-off-by: Kishon Vijay Abraham I Reviewed-by: Tom Lendacky Reviewed-by: Pankaj Gupta Acked-by: Borislav Petkov (AMD) Signed-off-by: Kim Phillips Link: https://lore.kernel.org/r/20250310201603.1217954-2-kim.phillips@amd.com Signed-off-by: Sean Christopherson --- diff --git a/arch/x86/include/asm/cpufeatures.h b/arch/x86/include/asm/cpufeatures.h index 6c2c152d8a67b..e95a8e9ef22b3 100644 --- a/arch/x86/include/asm/cpufeatures.h +++ b/arch/x86/include/asm/cpufeatures.h @@ -446,6 +446,7 @@ #define X86_FEATURE_DEBUG_SWAP (19*32+14) /* "debug_swap" SEV-ES full debug state swap support */ #define X86_FEATURE_RMPREAD (19*32+21) /* RMPREAD instruction */ #define X86_FEATURE_SEGMENTED_RMP (19*32+23) /* Segmented RMP support */ +#define X86_FEATURE_ALLOWED_SEV_FEATURES (19*32+27) /* Allowed SEV Features */ #define X86_FEATURE_SVSM (19*32+28) /* "svsm" SVSM present */ #define X86_FEATURE_HV_INUSE_WR_ALLOWED (19*32+30) /* Allow Write to in-use hypervisor-owned pages */