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

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.

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
Message-Id: <20180521215424.13520-3-berrange@redhat.com>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
(cherry picked from commit 403503b162)
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
stable-2.12
Konrad Rzeszutek Wilk 2018-05-21 22:54:23 +01:00 committed by Michael Roth
parent 3129ddb943
commit 43163837d3
1 changed files with 1 additions and 1 deletions
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target/i386/cpu.c
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@ -541,7 +541,7 @@ 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,
},
.cpuid_eax = 0x80000008,