From mboxrd@z Thu Jan  1 00:00:00 1970
From: David Ahern <daahern@cisco.com>
Subject: Re: [PATCH v2 00/11] KVM in-guest performance monitoring
Date: Tue, 14 Jun 2011 11:48:46 -0600
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Cc: Marcelo Tosatti <mtosatti@redhat.com>, kvm@vger.kernel.org,
	Ingo Molnar <mingo@elte.hu>,
	Peter Zijlstra <a.p.zijlstra@chello.nl>,
	Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
To: Avi Kivity <avi@redhat.com>
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On 06/14/2011 11:33 AM, David Ahern wrote:
> Avi: still no luck:
> [    0.047996] Performance Events: unsupported p6 CPU model 0 no PMU
> driver, software events only.
> 
> qemu-kvm next branch, ce5f0a588b740e8f28f46a6009e12cfa72edc51f with your
> perfmon cpuid change. Host and guest are both running your kvm next
> branch with pmu patch series.

The perf init code is going down the !perfmon route:

	if (!cpu_has(&boot_cpu_data, X86_FEATURE_ARCH_PERFMON)) {
		switch (boot_cpu_data.x86) {
		case 0x6:
			return p6_pmu_init();
		case 0xf:
			return p4_pmu_init();
		}
		return -ENODEV;
	}

Based on Patch 2 you are expecting the guest to have this feature set.
I've tried +perfmon and +arch_perfmon in the cpu definition for qemu-kvm
(e.g., -cpu host,model=0,+perfmon) no luck

David