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

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AMD Zen expose the Intel equivalant to Speculative Store Bypass Disable
via the 0x80000008_EBX[25] CPUID feature bit.

This needs to be exposed to guest OS to allow them to protect
against CVE-2018-3639.

Backports commit 403503b162ffc33fb64cfefdf7b880acf41772cd from qemu
This commit is contained in:
Konrad Rzeszutek Wilk 2018-05-22 16:58:19 -04:00 committed by Lioncash
parent 860411e045
commit a08dcb8aa6
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GPG key ID: 4E3C3CC1031BA9C7
1 changed files with 1 additions and 1 deletions
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qemu/target/i386/cpu.c
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@ -734,7 +734,7 @@ static FeatureWordInfo feature_word_info[FEATURE_WORDS] = {
"ibpb", NULL, NULL, NULL,
NULL, NULL, NULL, NULL,
NULL, NULL, NULL, NULL,
NULL, NULL, NULL, NULL,
NULL, "virt-ssbd", NULL, NULL,
NULL, NULL, NULL, NULL,
},
0x80000008,