linux-kernel - [tip: x86/sgx] x86/cpufeatures: Add X86_FEATURE_SGX

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Message-ID: <176065159861.709179.13171067458385458125.tip-bot2@tip-bot2>
Date: Thu, 16 Oct 2025 21:53:18 -0000
From: "tip-bot2 for Elena Reshetova" <tip-bot2@...utronix.de>
To: linux-tip-commits@...r.kernel.org
Cc: Elena Reshetova <elena.reshetova@...el.com>,
 Dave Hansen <dave.hansen@...ux.intel.com>,
 Jarkko Sakkinen <jarkko@...nel.org>, Kai Huang <kai.huang@...el.com>,
 Nataliia Bondarevska <bondarn@...gle.com>, x86@...nel.org,
 linux-kernel@...r.kernel.org
Subject:
 [tip: x86/sgx] x86/cpufeatures: Add X86_FEATURE_SGX_EUPDATESVN feature flag

The following commit has been merged into the x86/sgx branch of tip:

Commit-ID:     6ffdb49101f023136a9a1fb0deb59eba73c306a3
Gitweb:        https://git.kernel.org/tip/6ffdb49101f023136a9a1fb0deb59eba73c306a3
Author:        Elena Reshetova <elena.reshetova@...el.com>
AuthorDate:    Thu, 16 Oct 2025 16:11:05 +03:00
Committer:     Dave Hansen <dave.hansen@...ux.intel.com>
CommitterDate: Thu, 16 Oct 2025 14:42:08 -07:00

x86/cpufeatures: Add X86_FEATURE_SGX_EUPDATESVN feature flag

Add a flag indicating whenever ENCLS[EUPDATESVN] SGX instruction is
supported. This will be used by SGX driver to perform CPU SVN updates.

Signed-off-by: Elena Reshetova <elena.reshetova@...el.com>
Signed-off-by: Dave Hansen <dave.hansen@...ux.intel.com>
Reviewed-by: Jarkko Sakkinen <jarkko@...nel.org>
Reviewed-by: Kai Huang <kai.huang@...el.com>
Reviewed-by: Dave Hansen <dave.hansen@...ux.intel.com>
Tested-by: Nataliia Bondarevska <bondarn@...gle.com>
---
 arch/x86/include/asm/cpufeatures.h | 1 +
 arch/x86/kernel/cpu/cpuid-deps.c   | 1 +
 arch/x86/kernel/cpu/scattered.c    | 1 +
 3 files changed, 3 insertions(+)

diff --git a/arch/x86/include/asm/cpufeatures.h b/arch/x86/include/asm/cpufeatures.h
index 4091a77..76364b6 100644
--- a/arch/x86/include/asm/cpufeatures.h
+++ b/arch/x86/include/asm/cpufeatures.h
@@ -499,6 +499,7 @@
 #define X86_FEATURE_IBPB_EXIT_TO_USER	(21*32+14) /* Use IBPB on exit-to-userspace, see VMSCAPE bug */
 #define X86_FEATURE_ABMC		(21*32+15) /* Assignable Bandwidth Monitoring Counters */
 #define X86_FEATURE_MSR_IMM		(21*32+16) /* MSR immediate form instructions */
+#define X86_FEATURE_SGX_EUPDATESVN	(21*32+17) /* Support for ENCLS[EUPDATESVN] instruction */
 
 /*
  * BUG word(s)
diff --git a/arch/x86/kernel/cpu/cpuid-deps.c b/arch/x86/kernel/cpu/cpuid-deps.c
index 46efcbd..3d9f49a 100644
--- a/arch/x86/kernel/cpu/cpuid-deps.c
+++ b/arch/x86/kernel/cpu/cpuid-deps.c
@@ -79,6 +79,7 @@ static const struct cpuid_dep cpuid_deps[] = {
 	{ X86_FEATURE_SGX_LC,			X86_FEATURE_SGX	      },
 	{ X86_FEATURE_SGX1,			X86_FEATURE_SGX       },
 	{ X86_FEATURE_SGX2,			X86_FEATURE_SGX1      },
+	{ X86_FEATURE_SGX_EUPDATESVN,		X86_FEATURE_SGX1      },
 	{ X86_FEATURE_SGX_EDECCSSA,		X86_FEATURE_SGX1      },
 	{ X86_FEATURE_XFD,			X86_FEATURE_XSAVES    },
 	{ X86_FEATURE_XFD,			X86_FEATURE_XGETBV1   },
diff --git a/arch/x86/kernel/cpu/scattered.c b/arch/x86/kernel/cpu/scattered.c
index caa4dc8..3785035 100644
--- a/arch/x86/kernel/cpu/scattered.c
+++ b/arch/x86/kernel/cpu/scattered.c
@@ -43,6 +43,7 @@ static const struct cpuid_bit cpuid_bits[] = {
 	{ X86_FEATURE_PER_THREAD_MBA,		CPUID_ECX,  0, 0x00000010, 3 },
 	{ X86_FEATURE_SGX1,			CPUID_EAX,  0, 0x00000012, 0 },
 	{ X86_FEATURE_SGX2,			CPUID_EAX,  1, 0x00000012, 0 },
+	{ X86_FEATURE_SGX_EUPDATESVN,		CPUID_EAX, 10, 0x00000012, 0 },
 	{ X86_FEATURE_SGX_EDECCSSA,		CPUID_EAX, 11, 0x00000012, 0 },
 	{ X86_FEATURE_HW_PSTATE,		CPUID_EDX,  7, 0x80000007, 0 },
 	{ X86_FEATURE_CPB,			CPUID_EDX,  9, 0x80000007, 0 },