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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>
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@ -1258,6 +1258,7 @@ static void update_mds_branch_idle(void)
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#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"
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#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"
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#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"
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void cpu_bugs_smt_update(void)
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{
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@ -1302,6 +1303,16 @@ void cpu_bugs_smt_update(void)
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break;
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}
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switch (mmio_mitigation) {
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case MMIO_MITIGATION_VERW:
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case MMIO_MITIGATION_UCODE_NEEDED:
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if (sched_smt_active())
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pr_warn_once(MMIO_MSG_SMT);
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break;
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case MMIO_MITIGATION_OFF:
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break;
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}
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mutex_unlock(&spec_ctrl_mutex);
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}
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