x86, mce, cmci: disable CMCI on rebooting

Impact: Avoids confusing other OSes.

Disable the CMCI vector on reboot to avoid confusing other OS.

Signed-off-by: Andi Kleen <ak@linux.intel.com>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>

1 files changed, 8 insertions, 0 deletions

diff --git a/arch/x86/kernel/apic.c b/arch/x86/kernel/apic.c
index 570f36e44e59..648676f0b50a 100644
--- a/arch/x86/kernel/apic.c
+++ b/arch/x86/kernel/apic.c
@@ -868,6 +868,14 @@ void clear_local_APIC(void)
                 apic_write(APIC_LVTTHMR, v | APIC_LVT_MASKED);
         }
 #endif
+#ifdef CONFIG_X86_MCE_INTEL
+        if (maxlvt >= 6) {
+                v = apic_read(APIC_LVTCMCI);
+                if (!(v & APIC_LVT_MASKED))
+                        apic_write(APIC_LVTCMCI, v | APIC_LVT_MASKED);
+        }
+#endif
+
         /*
          * Clean APIC state for other OSs:
          */