Messages in this thread | | | Subject | Re: [V2 PATCH 0/6] x86, NMI: give NMI handler a face-lift | From | Peter Zijlstra <> | Date | Thu, 18 Nov 2010 21:04:20 +0100 |
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On Thu, 2010-11-18 at 13:51 -0600, Jason Wessel wrote: > I highly doubt we want to disable perf. I would rather use the source > and fix the nmi emulation in KVM/Qemu after we hear back the results > from Cyril because it sounds as if the problem is nearly bottomed out.
Problem is that p6/p4/amd don't have cpuid bits telling us if there is a PMU (virt should clear those if it doesn't emulate one).
I guess the safest course is to write a pmu msr and see if that faults, if it does, disable the thing.
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