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i386: define the 'ssbd' CPUID feature bit (CVE-2018-3639)

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New microcode introduces the "Speculative Store Bypass Disable"
CPUID feature bit. This needs to be exposed to guest OS to allow
them to protect against CVE-2018-3639.

Backports commit d19d1f965904a533998739698020ff4ee8a103da from qemu
This commit is contained in:
Daniel P. Berrangé 2018-05-22 16:56:28 -04:00 committed by Lioncash
parent 752fd5dd12
commit 795bcc7de3
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GPG key ID: 4E3C3CC1031BA9C7
2 changed files with 2 additions and 1 deletions
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2
qemu/target/i386/cpu.c
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@ -661,7 +661,7 @@ 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",
},
7,
true, 0,

1
qemu/target/i386/cpu.h
View file

@ -663,6 +663,7 @@ 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 KVM_HINTS_DEDICATED (1U << 0)