linux-kernel - [PATCH v9 06/14] x86/keylocker: Define Key Locker CPUID leaf

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Date: Thu, 28 Mar 2024 18:53:38 -0700
From: "Chang S. Bae" <chang.seok.bae@...el.com>
To: linux-kernel@...r.kernel.org,
	linux-crypto@...r.kernel.org,
	dm-devel@...hat.com
Cc: ebiggers@...nel.org,
	luto@...nel.org,
	dave.hansen@...ux.intel.com,
	tglx@...utronix.de,
	bp@...en8.de,
	mingo@...nel.org,
	x86@...nel.org,
	herbert@...dor.apana.org.au,
	ardb@...nel.org,
	elliott@....com,
	dan.j.williams@...el.com,
	bernie.keany@...el.com,
	charishma1.gairuboyina@...el.com,
	chang.seok.bae@...el.com
Subject: [PATCH v9 06/14] x86/keylocker: Define Key Locker CPUID leaf

Both Key Locker enabling code in the x86 core and AES Key Locker code
in the crypto library will need to reference feature-specific CPUID bits.
Define this CPUID leaf and bits.

Signed-off-by: Chang S. Bae <chang.seok.bae@...el.com>
Reviewed-by: Dan Williams <dan.j.williams@...el.com>
---
Changes from v6:
* Tweak the changelog -- comment the reason first and then brief the
  change.

Changes from RFC v2:
* Separate out the code as a new patch.
---
 arch/x86/include/asm/keylocker.h | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/arch/x86/include/asm/keylocker.h b/arch/x86/include/asm/keylocker.h
index 4e731f577c50..1213d273c369 100644
--- a/arch/x86/include/asm/keylocker.h
+++ b/arch/x86/include/asm/keylocker.h
@@ -5,6 +5,7 @@
 
 #ifndef __ASSEMBLY__
 
+#include <linux/bits.h>
 #include <asm/fpu/types.h>
 
 /**
@@ -21,5 +22,11 @@ struct iwkey {
 	struct reg_128_bit encryption_key[2];
 };
 
+#define KEYLOCKER_CPUID			0x019
+#define KEYLOCKER_CPUID_EAX_SUPERVISOR	BIT(0)
+#define KEYLOCKER_CPUID_EBX_AESKLE	BIT(0)
+#define KEYLOCKER_CPUID_EBX_WIDE	BIT(2)
+#define KEYLOCKER_CPUID_EBX_BACKUP	BIT(4)
+
 #endif /*__ASSEMBLY__ */
 #endif /* _ASM_KEYLOCKER_H */
-- 
2.34.1