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x86/srso: Disable the mitigation on unaffected configurations
commite9fbc47b81
upstream. Skip the srso cmd line parsing which is not needed on Zen1/2 with SMT disabled and with the proper microcode applied (latter should be the case anyway) as those are not affected. Fixes:5a15d83488
("x86/srso: Tie SBPB bit setting to microcode patch detection") Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de> Link: https://lore.kernel.org/r/20230813104517.3346-1-bp@alien8.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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1 changed files with 6 additions and 1 deletions
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@ -2399,8 +2399,10 @@ static void __init srso_select_mitigation(void)
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* IBPB microcode has been applied.
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*/
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if ((boot_cpu_data.x86 < 0x19) &&
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(!cpu_smt_possible() || (cpu_smt_control == CPU_SMT_DISABLED)))
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(!cpu_smt_possible() || (cpu_smt_control == CPU_SMT_DISABLED))) {
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setup_force_cpu_cap(X86_FEATURE_SRSO_NO);
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return;
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}
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}
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if (retbleed_mitigation == RETBLEED_MITIGATION_IBPB) {
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@ -2686,6 +2688,9 @@ static ssize_t gds_show_state(char *buf)
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static ssize_t srso_show_state(char *buf)
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{
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if (boot_cpu_has(X86_FEATURE_SRSO_NO))
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return sysfs_emit(buf, "Not affected\n");
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return sysfs_emit(buf, "%s%s\n",
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srso_strings[srso_mitigation],
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(cpu_has_ibpb_brtype_microcode() ? "" : ", no microcode"));
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