linux-kernel - [PATCH v3 2/2] x86/cpu/intel: Move TME MSR definitions to msr-index.h

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Message-ID: <878r8qylp6.fsf@jcompost-mobl.amr.corp.intel.com>
Date:   Thu, 28 Sep 2023 15:31:01 -0700
From:   "Compostella, Jeremy" <jeremy.compostella@...el.com>
To:     <linux-kernel@...r.kernel.org>, <x86@...nel.org>,
        Ingo Molnar <mingo@...nel.org>, Borislav Petkov <bp@...en8.de>,
        "Li, Xin3" <xin3.li@...el.com>, "Huang, Kai" <kai.huang@...el.com>
Subject: [PATCH v3 2/2] x86/cpu/intel: Move TME MSR definitions to msr-index.h

MSRs and their bits definitions are usually centralized
in arch/x86/include/asm/msr-index.h.

Changes for v3:
Take review comments into account by focusing only on the MSR
definition move to msr-index.h.

Signed-off-by: Jeremy Compostella <jeremy.compostella@...el.com>
---
 arch/x86/include/asm/msr-index.h | 11 +++++++++++
 arch/x86/kernel/cpu/intel.c      | 21 +++++++++++++--------
 2 files changed, 24 insertions(+), 8 deletions(-)

diff --git a/arch/x86/include/asm/msr-index.h b/arch/x86/include/asm/msr-index.h
index 1d111350197f..25303194cf5a 100644
--- a/arch/x86/include/asm/msr-index.h
+++ b/arch/x86/include/asm/msr-index.h
@@ -1092,6 +1092,17 @@
 #define VMX_BASIC_MEM_TYPE_WB	6LLU
 #define VMX_BASIC_INOUT		0x0040000000000000LLU
 
+/* Total Memory Encryption */
+#define MSR_IA32_TME_ACTIVATE			0x982
+#define MSR_IA32_TME_ACTIVATE_LOCKED		BIT(0)
+#define MSR_IA32_TME_ACTIVATE_ENABLED		BIT(1)
+#define MSR_IA32_TME_ACTIVATE_POLICY_OFFSET	4
+#define MSR_IA32_TME_ACTIVATE_POLICY_MASK	0xf
+#define MSR_IA32_TME_ACTIVATE_KEYID_BITS_OFFSET	32
+#define MSR_IA32_TME_ACTIVATE_KEYID_BITS_MASK	0xf
+#define MSR_IA32_TME_ACTIVATE_CRYPTO_ALG_OFFSET	48
+#define MSR_IA32_TME_ACTIVATE_CRYPTO_ALG_MASK	0xffff
+
 /* Resctrl MSRs: */
 /* - Intel: */
 #define MSR_IA32_L3_QOS_CFG		0xc81
diff --git a/arch/x86/kernel/cpu/intel.c b/arch/x86/kernel/cpu/intel.c
index 17240b96ffda..19db92b72ece 100644
--- a/arch/x86/kernel/cpu/intel.c
+++ b/arch/x86/kernel/cpu/intel.c
@@ -184,18 +184,22 @@ static bool bad_spectre_microcode(struct cpuinfo_x86 *c)
 	return false;
 }
 
-#define MSR_IA32_TME_ACTIVATE		0x982
-
 /* Helpers to access TME_ACTIVATE MSR */
-#define TME_ACTIVATE_LOCKED(x)		(x & 0x1)
-#define TME_ACTIVATE_ENABLED(x)		(x & 0x2)
+#define TME_ACTIVATE_IS_LOCKED(x)	(x & MSR_IA32_TME_ACTIVATE_LOCKED)
+#define TME_ACTIVATE_IS_ENABLED(x)	(x & MSR_IA32_TME_ACTIVATE_ENABLED)
 
-#define TME_ACTIVATE_POLICY(x)		((x >> 4) & 0xf)	/* Bits 7:4 */
+#define TME_ACTIVATE_POLICY(x)	\
+	((x >> MSR_IA32_TME_ACTIVATE_POLICY_OFFSET)	\
+	 & MSR_IA32_TME_ACTIVATE_POLICY_MASK)
 #define TME_ACTIVATE_POLICY_AES_XTS_128	0
 
-#define TME_ACTIVATE_KEYID_BITS(x)	((x >> 32) & 0xf)	/* Bits 35:32 */
+#define TME_ACTIVATE_KEYID_BITS(x)			\
+	((x >> MSR_IA32_TME_ACTIVATE_KEYID_BITS_OFFSET)	\
+	 & MSR_IA32_TME_ACTIVATE_KEYID_BITS_MASK)
 
-#define TME_ACTIVATE_CRYPTO_ALGS(x)	((x >> 48) & 0xffff)	/* Bits 63:48 */
+#define TME_ACTIVATE_CRYPTO_ALGS(x)			\
+	((x >> MSR_IA32_TME_ACTIVATE_CRYPTO_ALG_OFFSET)	\
+	 & MSR_IA32_TME_ACTIVATE_CRYPTO_ALG_MASK)
 #define TME_ACTIVATE_CRYPTO_AES_XTS_128	1
 
 /* Values for mktme_status (SW only construct) */
@@ -225,7 +229,8 @@ static void detect_tme(struct cpuinfo_x86 *c)
 		tme_activate_cpu0 = tme_activate;
 	}
 
-	if (!TME_ACTIVATE_LOCKED(tme_activate) || !TME_ACTIVATE_ENABLED(tme_activate)) {
+	if (!TME_ACTIVATE_IS_LOCKED(tme_activate) ||
+	    !TME_ACTIVATE_IS_ENABLED(tme_activate)) {
 		pr_info_once("x86/tme: not enabled by BIOS\n");
 		mktme_status = MKTME_DISABLED;
 		return;
-- 
2.40.1