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.
--
error compiling committee.c: too many arguments to function
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