linux-kernel - [PATCH] x86/sgx: Use ENCLS mnemonic in <kernel/cpu/sgx/encls.h>

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Message-ID: <20250616085716.158942-1-ubizjak@gmail.com>
Date: Mon, 16 Jun 2025 10:56:30 +0200
From: Uros Bizjak <ubizjak@...il.com>
To: linux-sgx@...r.kernel.org,
	x86@...nel.org,
	linux-kernel@...r.kernel.org
Cc: Uros Bizjak <ubizjak@...il.com>,
	Jarkko Sakkinen <jarkko@...nel.org>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...nel.org>,
	Borislav Petkov <bp@...en8.de>,
	"H. Peter Anvin" <hpa@...or.com>
Subject: [PATCH] x86/sgx: Use ENCLS mnemonic in <kernel/cpu/sgx/encls.h>

Current minimum required version of binutils is 2.30,
which supports ENCLS instruction mnemonic.

Replace the byte-wise specification of ENCLS with
this proper mnemonic.

No functional change intended.

Signed-off-by: Uros Bizjak <ubizjak@...il.com>
Cc: Jarkko Sakkinen <jarkko@...nel.org>
Cc: Dave Hansen <dave.hansen@...ux.intel.com>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Ingo Molnar <mingo@...nel.org>
Cc: Borislav Petkov <bp@...en8.de>
Cc: "H. Peter Anvin" <hpa@...or.com>
---
 arch/x86/kernel/cpu/sgx/encls.h | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/arch/x86/kernel/cpu/sgx/encls.h b/arch/x86/kernel/cpu/sgx/encls.h
index 99004b02e2ed..42a088a337c5 100644
--- a/arch/x86/kernel/cpu/sgx/encls.h
+++ b/arch/x86/kernel/cpu/sgx/encls.h
@@ -68,7 +68,7 @@ static inline bool encls_failed(int ret)
 	({							\
 	int ret;						\
 	asm volatile(						\
-	"1: .byte 0x0f, 0x01, 0xcf;\n\t"			\
+	"1: encls\n"						\
 	"2:\n"							\
 	_ASM_EXTABLE_TYPE(1b, 2b, EX_TYPE_FAULT_SGX)		\
 	: "=a"(ret)						\
@@ -111,8 +111,8 @@ static inline bool encls_failed(int ret)
 	({							\
 	int ret;						\
 	asm volatile(						\
-	"1: .byte 0x0f, 0x01, 0xcf;\n\t"			\
-	"   xor %%eax,%%eax;\n"					\
+	"1: encls\n\t"						\
+	"xor %%eax,%%eax\n"					\
 	"2:\n"							\
 	_ASM_EXTABLE_TYPE(1b, 2b, EX_TYPE_FAULT_SGX)		\
 	: "=a"(ret), "=b"(rbx_out)				\
-- 
2.49.0