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x86/bugs: Add attack vector controls for spectre_v1

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Use attack vector controls to determine if spectre_v1 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/20250707183316.1349127-12-david.kaplan@amd.com
This commit is contained in:
David Kaplan 2025-07-07 13:33:06 -05:00 committed by Borislav Petkov (AMD)
parent 8c7261abcb
commit 19a5f3ea43
1 changed files with 5 additions and 2 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

7
arch/x86/kernel/cpu/bugs.c
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@ -1144,13 +1144,16 @@ static bool smap_works_speculatively(void)
static void __init spectre_v1_select_mitigation(void)
{
if (!boot_cpu_has_bug(X86_BUG_SPECTRE_V1) || cpu_mitigations_off())
if (!boot_cpu_has_bug(X86_BUG_SPECTRE_V1))
spectre_v1_mitigation = SPECTRE_V1_MITIGATION_NONE;
if (!should_mitigate_vuln(X86_BUG_SPECTRE_V1))
spectre_v1_mitigation = SPECTRE_V1_MITIGATION_NONE;
}
static void __init spectre_v1_apply_mitigation(void)
{
if (!boot_cpu_has_bug(X86_BUG_SPECTRE_V1) || cpu_mitigations_off())
if (!boot_cpu_has_bug(X86_BUG_SPECTRE_V1))
return;
if (spectre_v1_mitigation == SPECTRE_V1_MITIGATION_AUTO) {