File 0120-target-i386-define-md-clear-bit.patch of Package qemu.11142

Overview Repositories Revisions Requests Users Attributes Meta

File 0120-target-i386-define-md-clear-bit.patch of Package qemu.11142

From f3e0369f878149256876bfe12e392b91f8c4d62a 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 4cc30bc0df..dde876d15a 100644
--- a/target/i386/cpu.c
+++ b/target/i386/cpu.c
@@ -455,7 +455,7 @@ static FeatureWordInfo feature_word_info[FEATURE_WORDS] = {
         .feat_names = {
             NULL, NULL, "avx512-4vnniw", "avx512-4fmaps",
             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 8ce4a3e95e..5295894cf8 100644
--- a/target/i386/cpu.h
+++ b/target/i386/cpu.h
@@ -644,6 +644,7 @@ typedef uint32_t FeatureWordArray[FEATURE_WORDS];
 
 #define CPUID_7_0_EDX_AVX512_4VNNIW (1U << 2) /* AVX512 Neural Network Instructions */
 #define CPUID_7_0_EDX_AVX512_4FMAPS (1U << 3) /* AVX512 Multiply Accumulation Single Precision */
+#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 0120-target-i386-define-md-clear-bit.patch of Package qemu.11142

Places