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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