linux-kernel - [RFC PATCH 3/8] x86/msr-index: Add MSRs for Key Locker internal key

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Date:   Wed, 16 Dec 2020 09:41:41 -0800
From:   "Chang S. Bae" <chang.seok.bae@...el.com>
To:     tglx@...utronix.de, mingo@...nel.org, bp@...e.de, luto@...nel.org,
        x86@...nel.org, herbert@...dor.apana.org.au
Cc:     dan.j.williams@...el.com, dave.hansen@...el.com,
        ravi.v.shankar@...el.com, ning.sun@...el.com,
        kumar.n.dwarakanath@...el.com, linux-crypto@...r.kernel.org,
        linux-kernel@...r.kernel.org, chang.seok.bae@...el.com
Subject: [RFC PATCH 3/8] x86/msr-index: Add MSRs for Key Locker internal key

Key Locker internal key in a CPU state can be backed up in a platform
register. The backup can be also copied back to a CPU state. This mechanism
is useful to restore the key (after system sleep).

Add MSRs for the internal key backup, copy, and status check.

Signed-off-by: Chang S. Bae <chang.seok.bae@...el.com>
Cc: x86@...nel.org
Cc: linux-kernel@...r.kernel.org
---
 arch/x86/include/asm/msr-index.h | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/arch/x86/include/asm/msr-index.h b/arch/x86/include/asm/msr-index.h
index 972a34d93505..c0b9157806f7 100644
--- a/arch/x86/include/asm/msr-index.h
+++ b/arch/x86/include/asm/msr-index.h
@@ -922,4 +922,10 @@
 #define MSR_VM_IGNNE                    0xc0010115
 #define MSR_VM_HSAVE_PA                 0xc0010117
 
+/* MSRs for Key Locker Internal (Wrapping) Key management */
+#define MSR_IA32_COPY_LOCAL_TO_PLATFORM	0x00000d91
+#define MSR_IA32_COPY_PLATFORM_TO_LOCAL	0x00000d92
+#define MSR_IA32_COPY_STATUS		0x00000990
+#define MSR_IA32_IWKEYBACKUP_STATUS	0x00000991
+
 #endif /* _ASM_X86_MSR_INDEX_H */
-- 
2.17.1