diff options
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/include/asm/processor.h | 1 | ||||
| -rw-r--r-- | arch/x86/kernel/cpu/bugs.c | 18 |
2 files changed, 13 insertions, 6 deletions
diff --git a/arch/x86/include/asm/processor.h b/arch/x86/include/asm/processor.h index af0f576617eb..dab73faef9b0 100644 --- a/arch/x86/include/asm/processor.h +++ b/arch/x86/include/asm/processor.h @@ -849,6 +849,7 @@ void df_debug(struct pt_regs *regs, long error_code); enum mds_mitigations { MDS_MITIGATION_OFF, MDS_MITIGATION_FULL, + MDS_MITIGATION_VMWERV, }; #endif /* _ASM_X86_PROCESSOR_H */ diff --git a/arch/x86/kernel/cpu/bugs.c b/arch/x86/kernel/cpu/bugs.c index 999666648672..045d41bd6d7e 100644 --- a/arch/x86/kernel/cpu/bugs.c +++ b/arch/x86/kernel/cpu/bugs.c @@ -213,7 +213,8 @@ static enum mds_mitigations mds_mitigation = MDS_MITIGATION_FULL; static const char * const mds_strings[] = { [MDS_MITIGATION_OFF] = "Vulnerable", - [MDS_MITIGATION_FULL] = "Mitigation: Clear CPU buffers" + [MDS_MITIGATION_FULL] = "Mitigation: Clear CPU buffers", + [MDS_MITIGATION_VMWERV] = "Vulnerable: Clear CPU buffers attempted, no microcode", }; static void __init mds_select_mitigation(void) @@ -224,10 +225,9 @@ static void __init mds_select_mitigation(void) } if (mds_mitigation == MDS_MITIGATION_FULL) { - if (boot_cpu_has(X86_FEATURE_MD_CLEAR)) - static_branch_enable(&mds_user_clear); - else - mds_mitigation = MDS_MITIGATION_OFF; + if (!boot_cpu_has(X86_FEATURE_MD_CLEAR)) + mds_mitigation = MDS_MITIGATION_VMWERV; + static_branch_enable(&mds_user_clear); } pr_info("%s\n", mds_strings[mds_mitigation]); } @@ -687,8 +687,14 @@ void arch_smt_update(void) break; } - if (mds_mitigation == MDS_MITIGATION_FULL) + switch (mds_mitigation) { + case MDS_MITIGATION_FULL: + case MDS_MITIGATION_VMWERV: update_mds_branch_idle(); + break; + case MDS_MITIGATION_OFF: + break; + } mutex_unlock(&spec_ctrl_mutex); } |