linux-kernel - [PATCH 2/4] x86/speculation: Introduce SPEC_CTRL

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Date:   Wed, 21 Apr 2021 04:01:15 -0500
From:   Ramakrishna Saripalli <rsaripal@....com>
To:     <linux-kernel@...r.kernel.org>, <x86@...nel.org>,
        <tglx@...utronix.de>, <mingo@...hat.com>, <bp@...en8.de>
CC:     <bsd@...hat.com>, <rsaripal@....com>
Subject: [PATCH 2/4] x86/speculation: Introduce SPEC_CTRL_MSR bit for PSFD

From: Ramakrishna Saripalli <rk.saripalli@....com>

All AMD processors that support PSF implement a bit in
SPEC_CTRL MSR (0x48) to disable or enable Predictive Store
Forwarding.

Signed-off-by: Ramakrishna Saripalli<rk.saripalli@....com>
---
 arch/x86/include/asm/msr-index.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/x86/include/asm/msr-index.h b/arch/x86/include/asm/msr-index.h
index 546d6ecf0a35..f569918c8754 100644
--- a/arch/x86/include/asm/msr-index.h
+++ b/arch/x86/include/asm/msr-index.h
@@ -51,6 +51,8 @@
 #define SPEC_CTRL_STIBP			BIT(SPEC_CTRL_STIBP_SHIFT)	/* STIBP mask */
 #define SPEC_CTRL_SSBD_SHIFT		2	   /* Speculative Store Bypass Disable bit */
 #define SPEC_CTRL_SSBD			BIT(SPEC_CTRL_SSBD_SHIFT)	/* Speculative Store Bypass Disable */
+#define SPEC_CTRL_PSFD_SHIFT		7
+#define SPEC_CTRL_PSFD			BIT(SPEC_CTRL_PSFD_SHIFT)	/* Predictive Store Forwarding Disable */
 
 #define MSR_IA32_PRED_CMD		0x00000049 /* Prediction Command */
 #define PRED_CMD_IBPB			BIT(0)	   /* Indirect Branch Prediction Barrier */
-- 
2.25.1