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author | Josh Poimboeuf <jpoimboe@kernel.org> | 2022-05-23 09:11:49 -0700 |
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committer | Thomas Gleixner <tglx@linutronix.de> | 2022-06-01 10:54:53 +0200 |
commit | 1dc6ff02c8bf77d71b9b5d11cbc9df77cfb28626 (patch) | |
tree | 78e9b2be144caaba408557e9792355b5b09c7334 /arch | |
parent | 027bbb884be006b05d9c577d6401686053aa789e (diff) | |
download | linux-stable-1dc6ff02c8bf77d71b9b5d11cbc9df77cfb28626.tar.gz linux-stable-1dc6ff02c8bf77d71b9b5d11cbc9df77cfb28626.tar.bz2 linux-stable-1dc6ff02c8bf77d71b9b5d11cbc9df77cfb28626.zip |
x86/speculation/mmio: Print SMT warning
Similar to MDS and TAA, print a warning if SMT is enabled for the MMIO
Stale Data vulnerability.
Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'arch')
-rw-r--r-- | arch/x86/kernel/cpu/bugs.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/arch/x86/kernel/cpu/bugs.c b/arch/x86/kernel/cpu/bugs.c index ef4749097f42..a8a9f6406331 100644 --- a/arch/x86/kernel/cpu/bugs.c +++ b/arch/x86/kernel/cpu/bugs.c @@ -1258,6 +1258,7 @@ static void update_mds_branch_idle(void) #define MDS_MSG_SMT "MDS CPU bug present and SMT on, data leak possible. See https://www.kernel.org/doc/html/latest/admin-guide/hw-vuln/mds.html for more details.\n" #define TAA_MSG_SMT "TAA CPU bug present and SMT on, data leak possible. See https://www.kernel.org/doc/html/latest/admin-guide/hw-vuln/tsx_async_abort.html for more details.\n" +#define MMIO_MSG_SMT "MMIO Stale Data CPU bug present and SMT on, data leak possible. See https://www.kernel.org/doc/html/latest/admin-guide/hw-vuln/processor_mmio_stale_data.html for more details.\n" void cpu_bugs_smt_update(void) { @@ -1302,6 +1303,16 @@ void cpu_bugs_smt_update(void) break; } + switch (mmio_mitigation) { + case MMIO_MITIGATION_VERW: + case MMIO_MITIGATION_UCODE_NEEDED: + if (sched_smt_active()) + pr_warn_once(MMIO_MSG_SMT); + break; + case MMIO_MITIGATION_OFF: + break; + } + mutex_unlock(&spec_ctrl_mutex); } |