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x86/speculation/mmio: Print SMT warning

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Similar to MDS and TAA, print a warning if SMT is enabled for the MMIO
Stale Data vulnerability.

Signed-off-by: Josh Poimboeuf <[email protected]>
Signed-off-by: Thomas Gleixner <[email protected]>
This commit is contained in:
Josh Poimboeuf authored and Thomas Gleixner committed 2022-06-01 10:54:53 +02:00
1 parent 027bbb884b
commit 1dc6ff02c8
1 file changed
+11
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arch/x86/kernel/cpu/bugs.c
+11
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@@ -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);
}