On Thu, Jun 19, 2014 at 10:52:52AM -0700, Andi Kleen wrote: > Andi Kleen <a...@firstfloor.org> writes: > >> > >>> Signed-off-by: Kan Liang <kan.li...@intel.com> > >> > >> And here I thought that Andi was of the opinion that if you set CPUID to > >> indicate a particular CPU you had better also handle all its MSRs. > > > > Yes, philosophically that would be the right way, > > but we needed a short term fix to stop things from crashing, and that > > was the simplest. > > I should add there is another reason for this patch now, > and doing it in perf instead of somewhere else > (this should probably go into the description). > > With PT on enabling LBR can #GP. So perf needs to handle > this case without crashing. This can happen independently > of any hypervisors.
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