-stable review patch. If anyone has any objections, please let us know.
------------------
From: Andi Kleen <[EMAIL PROTECTED]>
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 Kivity <[EMAIL PROTECTED]>
Signed-off-by: Andi Kleen <[EMAIL PROTECTED]>
Signed-off-by: Linus Torvalds <[EMAIL PROTECTED]>
Signed-off-by: Greg Kroah-Hartman <[EMAIL PROTECTED]>
---
arch/i386/kernel/cpu/perfctr-watchdog.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
--- a/arch/i386/kernel/cpu/perfctr-watchdog.c
+++ b/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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