Commit 254790a9 authored by Konrad Rzeszutek Wilk's avatar Konrad Rzeszutek Wilk Committed by Eduardo Habkost
Browse files

i386: Define AMD's no SSB mitigation needed. 

AMD future CPUs expose a mechanism to tell the guest that the
Speculative Store Bypass Disable is not needed and that the
CPU is all good.

This is exposed via the CPUID 8000_0008.EBX[26] bit.

See 124441_AMD64_SpeculativeStoreBypassDisable_Whitepaper_final.pdf

A copy of this document is available at
        https://bugzilla.kernel.org/show_bug.cgi?id=199889



Signed-off-by: default avatarKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Message-Id: <20180601153809.15259-3-konrad.wilk@oracle.com>
Signed-off-by: default avatarEduardo Habkost <ehabkost@redhat.com>
parent a764f3f7

target/i386/cpu.c

+1 −1
Original line number Diff line number Diff line
@@ -1009,7 +1009,7 @@ static FeatureWordInfo feature_word_info[FEATURE_WORDS] = { 
            "ibpb", NULL, NULL, NULL,

            NULL, NULL, NULL, NULL,

            NULL, NULL, NULL, NULL,

            "amd-ssbd", "virt-ssbd", NULL, NULL,

            "amd-ssbd", "virt-ssbd", "amd-no-ssb", NULL,

            NULL, NULL, NULL, NULL,

        },

        .cpuid_eax = 0x80000008,