lkml.org 
[lkml]   [2021]   [Mar]   [2]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 22/23] x86/cpufeatures: Add the Virtual SPEC_CTRL feature
Date
From: Babu Moger <babu.moger@amd.com>

Newer AMD processors have a feature to virtualize the use of the
SPEC_CTRL MSR. Presence of this feature is indicated via CPUID
function 0x8000000A_EDX[20]: GuestSpecCtrl. When present, the
SPEC_CTRL MSR is automatically virtualized.

Signed-off-by: Babu Moger <babu.moger@amd.com>
Acked-by: Borislav Petkov <bp@suse.de>
Message-Id: <161188100272.28787.4097272856384825024.stgit@bmoger-ubuntu>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
arch/x86/include/asm/cpufeatures.h | 1 +
1 file changed, 1 insertion(+)

diff --git a/arch/x86/include/asm/cpufeatures.h b/arch/x86/include/asm/cpufeatures.h
index f1957b3c8e4e..9ac7ad4d8239 100644
--- a/arch/x86/include/asm/cpufeatures.h
+++ b/arch/x86/include/asm/cpufeatures.h
@@ -338,6 +338,7 @@
#define X86_FEATURE_AVIC (15*32+13) /* Virtual Interrupt Controller */
#define X86_FEATURE_V_VMSAVE_VMLOAD (15*32+15) /* Virtual VMSAVE VMLOAD */
#define X86_FEATURE_VGIF (15*32+16) /* Virtual GIF */
+#define X86_FEATURE_V_SPEC_CTRL (15*32+20) /* Virtual SPEC_CTRL */
#define X86_FEATURE_SVME_ADDR_CHK (15*32+28) /* "" SVME addr check */

/* Intel-defined CPU features, CPUID level 0x00000007:0 (ECX), word 16 */
--
2.26.2

\
 
 \ /
  Last update: 2021-03-03 03:41    [W:0.128 / U:1.148 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site