File 0094-i386-Add-bit-2-of-SPEC_CTRL-MSR-sup.patch of Package qemu.8158

From b688140cee03770cba2f90d723f6ed4f67b151dd Mon Sep 17 00:00:00 2001
From: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Date: Wed, 11 Apr 2018 17:26:51 -0400
Subject: [PATCH] i386: Add bit(2) of SPEC_CTRL MSR support - SSBD

i386: Add bit(2) of SPEC_CTRL MSR support - Reduced Data Speculation

Now users can do:

cpu host,+spec-ctrl,+ssbd

to have both IBRS and SSBD support.

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
[BR: BSC#1092885 CVE-2018-3639]
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 a97b61697e..2cbeaa25b2 100644
--- a/target/i386/cpu.c
+++ b/target/i386/cpu.c
@@ -461,7 +461,7 @@ static FeatureWordInfo feature_word_info[FEATURE_WORDS] = {
             NULL, NULL, NULL, NULL,
             NULL, NULL, NULL, NULL,
             NULL, NULL, "spec-ctrl", NULL,
-            NULL, NULL, NULL, NULL,
+            NULL, NULL, NULL, "ssbd",
         },
         .cpuid_eax = 7,
         .cpuid_needs_ecx = true, .cpuid_ecx = 0,
diff --git a/target/i386/cpu.h b/target/i386/cpu.h
index e0a59d78e2..395e879434 100644
--- a/target/i386/cpu.h
+++ b/target/i386/cpu.h
@@ -642,6 +642,7 @@ 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_SPEC_CTRL     (1U << 26) /* Speculation Control */
+#define CPUID_7_0_EDX_SPEC_CTRL_SSBD  (1U << 31) /* Speculative Store Bypass Disable */
 
 #define CPUID_8000_0008_EBX_IBPB    (1U << 12) /* Indirect Branch Prediction Barrier */