linux-kernel - [PATCH v9b 12/14] x86/Kconfig: Add symbols for Key Locker

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Date: Tue, 11 Jun 2024 14:36:09 -0700
From: "Chang S. Bae" <chang.seok.bae@...el.com>
To: ebiggers@...nel.org,
	linux-crypto@...r.kernel.org
Cc: linux-kernel@...r.kernel.org,
	bernie.keany@...el.com,
	chang.seok.bae@...el.com
Subject: [PATCH v9b 12/14] x86/Kconfig: Add symbols for Key Locker

Add CONFIG_X86_KEYLOCKER to control whether Key Locker is initialized at
boot. Additionally, add the AS_KEYLOCKER config symbol to indicate
whether the assembler supports Key Locker.

The former will be selected, and the latter will be referenced by the Key
Locker cipher module CRYPTO_AES_KL, to be added in a later patch.

Signed-off-by: Chang S. Bae <chang.seok.bae@...el.com>
---
Changes from v9:
* Include AS_KEYLOCKER symbol (Eric Biggers).
* Revoke the earlier tag.
---
 arch/x86/Kconfig           | 3 +++
 arch/x86/Kconfig.assembler | 5 +++++
 2 files changed, 8 insertions(+)

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 1d7122a1883e..ce4e4c1641da 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -1881,6 +1881,9 @@ config X86_INTEL_MEMORY_PROTECTION_KEYS
 
 	  If unsure, say y.
 
+config X86_KEYLOCKER
+	bool
+
 choice
 	prompt "TSX enable mode"
 	depends on CPU_SUP_INTEL
diff --git a/arch/x86/Kconfig.assembler b/arch/x86/Kconfig.assembler
index 59aedf32c4ea..e6ce80d23113 100644
--- a/arch/x86/Kconfig.assembler
+++ b/arch/x86/Kconfig.assembler
@@ -35,6 +35,11 @@ config AS_VPCLMULQDQ
 	help
 	  Supported by binutils >= 2.30 and LLVM integrated assembler
 
+config AS_KEYLOCKER
+	def_bool $(as-instr,encodekey256 %eax$(comma)%eax)
+	help
+	  Supported by binutils >= 2.36 and LLVM integrated assembler >= V12
+
 config AS_WRUSS
 	def_bool $(as-instr,wrussq %rax$(comma)(%rbx))
 	help
-- 
2.34.1