File 0331-target-i386-define-md-clear-bit.patch of Package qemu.11145

Overview Repositories Revisions Requests Users Attributes Meta

File 0331-target-i386-define-md-clear-bit.patch of Package qemu.11145

From 968a92e001c9ed95e94d9844889d417e00b2d41f Mon Sep 17 00:00:00 2001
From: Paolo Bonzini <pbonzini@redhat.com>
Date: Fri, 1 Mar 2019 21:40:52 +0100
Subject: [PATCH] target/i386: define md-clear bit

md-clear is a new CPUID bit which is set when microcode provides the
mechanism to invoke a flush of various exploitable CPU buffers by invoking
the VERW instruction.  Add the new feature.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
[BR: BSC#1111331 CVE-2018-12126 CVE-2018-12127 CVE-2018-12130
CVE-2019-11091]
Signed-off-by: Bruce Rogers <brogers@suse.com>
---
 target-i386/cpu.c | 2 +-
 target-i386/cpu.h | 1 +
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/target-i386/cpu.c b/target-i386/cpu.c
index 8f54d4b190..5b4c12557e 100644
--- a/target-i386/cpu.c
+++ b/target-i386/cpu.c
@@ -284,7 +284,7 @@ static const char *cpuid_7_0_ecx_feature_name[] = {
 static const char *cpuid_7_0_edx_feature_name[] = {
     NULL, NULL, NULL, NULL,
     NULL, NULL, NULL, NULL,
-    NULL, NULL, NULL, NULL,
+    NULL, NULL, "md-clear", NULL,
     NULL, NULL, NULL, NULL,
     NULL, NULL, NULL, NULL,
     NULL, NULL, NULL, NULL,
diff --git a/target-i386/cpu.h b/target-i386/cpu.h
index 7bcacd92b5..c48fd59ec5 100644
--- a/target-i386/cpu.h
+++ b/target-i386/cpu.h
@@ -611,6 +611,7 @@ typedef uint32_t FeatureWordArray[FEATURE_WORDS];
 
 #define CPUID_7_0_ECX_PKU      (1U << 3)
 #define CPUID_7_0_ECX_OSPKE    (1U << 4)
+#define CPUID_7_0_EDX_MD_CLEAR      (1U << 10) /* Microarchitectural Data Clear */
 #define CPUID_7_0_EDX_SPEC_CTRL     (1U << 26) /* Speculation Control */
 #define CPUID_7_0_EDX_SPEC_CTRL_SSBD  (1U << 31) /* Speculative Store Bypass Disable */

Places

File 0331-target-i386-define-md-clear-bit.patch of Package qemu.11145

Places