Re: nmi is broken?

[Avi Kivity <avi@redhat.com>]

On 05/03/2011 05:29 PM, Jan Kiszka wrote:
> On 2011-05-03 15:31, Avi Kivity wrote:
> >  On 05/03/2011 01:37 PM, Jan Kiszka wrote:
> >>>
> >>>   Yes.  Unfortunately that is very vendor and model specific.  The
> >>>   architectural PMU is supported, but that is only available on Intel.
> >>
> >>  Is it supposed to have any practical value already? I did not yet find a
> >>  magic -cpu switch to let Linux detect anything, not to speak of perf or
> >>  watchdog support.
> >
> >  On the guest side it is supported for the watchdog
> >  (arch/x86/kernel/cpu/perfctr-watchdog.c, look for
> >  X86_FEATURE_ARCH_PERFMON).  It's also mentioned in perf_event_intel.c,
> >  but I don't know if it will work without the other PMU features being
> >  present.
>
> I've tested with some SUSE 2.6.38 guest kernel, and it complained like
> this:
>
> (-cpu kvm64)
> Performance Events: unsupported Netburst CPU model 6 no PMU driver, software events only.
> NMI watchdog disabled (cpu0): hardware events not enabled
>

Sorry, I meant to write, but forgot, that on the host side it is 
completely unsupported.  It shouldn't be too hard to use perf_events to 
emulate the architectural PMU.  Once we do that we can expose the 
architectural pmu bit and the guest will use it.

-- 
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