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x86/bugs: Add attack vector controls for GDS

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Use attack vector controls to determine if GDS mitigation is required.

Signed-off-by: David Kaplan <david.kaplan@amd.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Link: https://lore.kernel.org/20250707183316.1349127-11-david.kaplan@amd.com
This commit is contained in:
David Kaplan 2025-07-07 13:33:05 -05:00 committed by Borislav Petkov (AMD)
parent 71dc301c26
commit 8c7261abcb
1 changed files with 8 additions and 5 deletions
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13
arch/x86/kernel/cpu/bugs.c
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@ -1030,12 +1030,15 @@ static void __init gds_select_mitigation(void)
return;
}
if (cpu_mitigations_off())
gds_mitigation = GDS_MITIGATION_OFF;
/* Will verify below that mitigation _can_ be disabled */
if (gds_mitigation == GDS_MITIGATION_AUTO)
gds_mitigation = GDS_MITIGATION_FULL;
if (gds_mitigation == GDS_MITIGATION_AUTO) {
if (should_mitigate_vuln(X86_BUG_GDS))
gds_mitigation = GDS_MITIGATION_FULL;
else {
gds_mitigation = GDS_MITIGATION_OFF;
return;
}
}
/* No microcode */
if (!(x86_arch_cap_msr & ARCH_CAP_GDS_CTRL)) {