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Subject[PATCH] [10/11] i386: Handle P6s without performance counters in nmi watchdog
Date

I got an oops while booting a 32bit kernel on KVM because it doesn't
implement performance counters used by the NMI watchdog. Handle this
case.

Cc: avi@qumranet.com

Signed-off-by: Andi Kleen <ak@suse.de>

Index: linux/arch/i386/kernel/cpu/perfctr-watchdog.c
===================================================================
--- linux.orig/arch/i386/kernel/cpu/perfctr-watchdog.c
+++ linux/arch/i386/kernel/cpu/perfctr-watchdog.c
@@ -346,7 +346,9 @@ static int setup_p6_watchdog(unsigned nm
perfctr_msr = MSR_P6_PERFCTR0;
evntsel_msr = MSR_P6_EVNTSEL0;

- wrmsrl(perfctr_msr, 0UL);
+ /* KVM doesn't implement this MSR */
+ if (wrmsr_safe(perfctr_msr, 0, 0) < 0)
+ return 0;

evntsel = P6_EVNTSEL_INT
| P6_EVNTSEL_OS
-
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