linux-kernel - [PATCH 3.16 219/366] x86/cpufeatures: Hide AMD-specific speculation flags

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Date:   Sun, 11 Nov 2018 19:49:05 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org
Subject: [PATCH 3.16 219/366] x86/cpufeatures: Hide AMD-specific
 speculation flags

3.16.61-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Ben Hutchings <ben@...adent.org.uk>

Hide the AMD_{IBRS,IBPB,STIBP} flag from /proc/cpuinfo.  This was done
upstream as part of commit e7c587da1252 "x86/speculation: Use
synthetic bits for IBRS/IBPB/STIBP".  I already backported that commit
but accidentally dropped this part.

Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
--- a/arch/x86/include/asm/cpufeature.h
+++ b/arch/x86/include/asm/cpufeature.h
@@ -253,9 +253,9 @@
 #define X86_FEATURE_SPEC_CTRL_SSBD	(10*32+31) /* "" Speculative Store Bypass Disable */
 
 /* AMD-defined CPU features, CPUID level 0x80000008 (EBX), word 11 */
-#define X86_FEATURE_AMD_IBPB		(11*32+12) /* Indirect Branch Prediction Barrier */
-#define X86_FEATURE_AMD_IBRS		(11*32+14) /* Indirect Branch Restricted Speculation */
-#define X86_FEATURE_AMD_STIBP		(11*32+15) /* Single Thread Indirect Branch Predictors */
+#define X86_FEATURE_AMD_IBPB		(11*32+12) /* "" Indirect Branch Prediction Barrier */
+#define X86_FEATURE_AMD_IBRS		(11*32+14) /* "" Indirect Branch Restricted Speculation */
+#define X86_FEATURE_AMD_STIBP		(11*32+15) /* "" Single Thread Indirect Branch Predictors */
 #define X86_FEATURE_VIRT_SSBD		(11*32+25) /* Virtualized Speculative Store Bypass Disable */
 
 /*