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x86/bugs: Allow retbleed=stuff only on Intel

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The retbleed=stuff mitigation is only applicable for Intel CPUs affected
by retbleed.  If this option is selected for another vendor, print a
warning and fall back to the AUTO option.

Signed-off-by: David Kaplan <david.kaplan@amd.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Josh Poimboeuf <jpoimboe@kernel.org>
Link: https://lore.kernel.org/20250418161721.1855190-10-david.kaplan@amd.com
This commit is contained in:
David Kaplan
2025-04-18 11:17:14 -05:00
committed by Borislav Petkov (AMD)
parent 46d5925b8e
commit 83d4b19331
1 changed files with 4 additions and 0 deletions
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4
arch/x86/kernel/cpu/bugs.c
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@@ -1191,6 +1191,10 @@ static void __init retbleed_select_mitigation(void)
case RETBLEED_CMD_STUFF:
if (IS_ENABLED(CONFIG_MITIGATION_CALL_DEPTH_TRACKING) &&
spectre_v2_enabled == SPECTRE_V2_RETPOLINE) {
if (boot_cpu_data.x86_vendor != X86_VENDOR_INTEL) {
pr_err("WARNING: retbleed=stuff only supported for Intel CPUs.\n");
goto do_cmd_auto;
}
retbleed_mitigation = RETBLEED_MITIGATION_STUFF;
} else {