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    SubjectRe: perf with precise attribute kills all KVM based VMs
    On 7/11/12 1:10 AM, Gleb Natapov wrote:
    > Looks like Avi is right about the overshoot. Can you test something like this?
    >
    > diff --git a/arch/x86/kernel/cpu/perf_event_intel.c b/arch/x86/kernel/cpu/perf_event_intel.c
    > index 166546e..5fb371a 100644
    > --- a/arch/x86/kernel/cpu/perf_event_intel.c
    > +++ b/arch/x86/kernel/cpu/perf_event_intel.c
    > @@ -1374,8 +1374,11 @@ static struct perf_guest_switch_msr *intel_guest_get_msrs(int *nr)
    > arr[0].msr = MSR_CORE_PERF_GLOBAL_CTRL;
    > arr[0].host = x86_pmu.intel_ctrl & ~cpuc->intel_ctrl_guest_mask;
    > arr[0].guest = x86_pmu.intel_ctrl & ~cpuc->intel_ctrl_host_mask;
    > + arr[1].msr = MSR_IA32_PEBS_ENABLE;
    > + arr[1].host = cpuc->pebs_enabled;
    > + arr[1].guest = 0;
    > + *nr = 2;
    >
    > - *nr = 1;
    > return arr;
    > }


    Tested-by: David Ahern <dsahern@gmail.com>

    Peter's patch is required as well. It's the combination that fixes the
    problem.

    David


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