diff options
| author | Andi Kleen <ak@suse.de> | 2007-08-15 12:38:58 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2007-08-22 16:23:27 -0700 |
| commit | c2c1d493fa0ee16491bffd6682cf4f479b8792c2 (patch) | |
| tree | c159b6d25fb2199f6490283e57a85b05bbfa03ec | |
| parent | 5097435305fa695dfa018efd662a18a7e5134e37 (diff) | |
i386: Handle P6s without performance counters in nmi watchdog
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 <avi@qumranet.com>
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
| -rw-r--r-- | arch/i386/kernel/cpu/perfctr-watchdog.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/arch/i386/kernel/cpu/perfctr-watchdog.c b/arch/i386/kernel/cpu/perfctr-watchdog.c index 4d26d514c56f..996f6f89ce8e 100644 --- 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 nmi_hz) 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 |