linux-kernel - [PATCH v4 1/2] x86/cpufeatures: Add "Allowed SEV Features" Feature

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Message-ID: <20250306003806.1048517-2-kim.phillips@amd.com>
Date: Wed, 5 Mar 2025 18:38:04 -0600
From: Kim Phillips <kim.phillips@....com>
To: <kvm@...r.kernel.org>, <linux-coco@...ts.linux.dev>,
	<linux-kernel@...r.kernel.org>
CC: Tom Lendacky <thomas.lendacky@....com>, Michael Roth
	<michael.roth@....com>, Ashish Kalra <ashish.kalra@....com>, "Nikunj A .
 Dadhania" <nikunj@....com>, Borislav Petkov <bp@...en8.de>, Dave Hansen
	<dave.hansen@...ux.intel.com>, Sean Christopherson <seanjc@...gle.com>,
	"Paolo Bonzini" <pbonzini@...hat.com>, Ingo Molnar <mingo@...hat.com>, "H.
 Peter Anvin" <hpa@...or.com>, Thomas Gleixner <tglx@...utronix.de>, Kim
 Phillips <kim.phillips@....com>
Subject: [PATCH v4 1/2] x86/cpufeatures: Add "Allowed SEV Features" Feature

From: Kishon Vijay Abraham I <kvijayab@....com>

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 <kvijayab@....com>
Reviewed-by: Tom Lendacky <thomas.lendacky@....com>
Signed-off-by: Kim Phillips <kim.phillips@....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 8f8aaf94dc00..6a12c8c48bd2 100644
--- a/arch/x86/include/asm/cpufeatures.h
+++ b/arch/x86/include/asm/cpufeatures.h
@@ -454,6 +454,7 @@
 #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 */
 
-- 
2.43.0