Commit 83d4b193 authored by David Kaplan's avatar David Kaplan Committed by Borislav Petkov (AMD)
Browse files

x86/bugs: Allow retbleed=stuff only on Intel 



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: default avatarDavid Kaplan <david.kaplan@amd.com>
Signed-off-by: default avatarBorislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: default avatarJosh Poimboeuf <jpoimboe@kernel.org>
Link: https://lore.kernel.org/20250418161721.1855190-10-david.kaplan@amd.com
parent 46d5925b

arch/x86/kernel/cpu/bugs.c

+4 −0
Original line number Diff line number Diff line
@@ -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 {