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Date: Fri, 20 Jul 2007 17:32:55 +0200 (CEST) From: Andi Kleen <ak@...e.de> To: avi@...ranet.com, patches@...-64.org, linux-kernel@...r.kernel.org Subject: [PATCH] [10/11] 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@...ranet.com Signed-off-by: Andi Kleen <ak@...e.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 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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