linux-kernel - Re: [PATCH v1 5/5] KVM: Expose a version 1 architectural PMU to guests

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Message-ID: <1307112113.2353.3391.camel@twins>
Date:	Fri, 03 Jun 2011 16:41:53 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Avi Kivity <avi@...hat.com>
Cc:	linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
	Ingo Molnar <mingo@...e.hu>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
Subject: Re: [PATCH v1 5/5] KVM: Expose a version 1 architectural PMU to
 guests

On Wed, 2011-05-11 at 11:55 -0400, Avi Kivity wrote:
> +static u64 read_gp_pmc(struct kvm_pmu *pmu, struct kvm_pmc *pmc)
> +{
> +       u64 counter, enabled, running;
> +
> +       counter = pmc->counter;
> +
> +       if (pmc->perf_event)
> +               counter += perf_event_read_value(pmc->perf_event,
> +                                                &enabled, &running);
> +
> +       /* FIXME: Scaling needed? */

Yeah, either that or use attr.pinned = 1, doing the latter will result
in an error when the PMU is overloaded though.

> +       return counter & pmu->counter_bitmask;
> +} 
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