linux-kernel - Re: [PATCH] perf/x86/intel: Use rdmsrl

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Message-ID: <20140314084429.GO27965@twins.programming.kicks-ass.net>
Date:	Fri, 14 Mar 2014 09:44:29 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Venkatesh Srinivas <venkateshs@...gle.com>
Cc:	linux-kernel@...r.kernel.org, eranian@...gle.com, mingo@...e.hu,
	ak@...ux.intel.com, zheng.z.yan@...el.com
Subject: Re: [PATCH] perf/x86/intel: Use rdmsrl_safe when initializing RAPL
 PMU.

On Thu, Mar 13, 2014 at 12:36:26PM -0700, Venkatesh Srinivas wrote:
> CPUs which should support the RAPL counters according to
> Family/Model/Stepping may still issue #GP when attempting to access
> the RAPL MSRs. This may happen when Linux is running under KVM and
> we are passing-through host F/M/S data, for example. Use rdmsrl_safe
> to first access the RAPL_POWER_UNIT MSR; if this fails, do not
> attempt to use this PMU.

This kvm thing is getting tedious :-(
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