Re: [PATCH] perf/x86/intel: Use rdmsrl_safe when initializing RAPL PMU.

Peter Zijlstra
2014-03-14T08:44:49Z

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 :-(