linux-kernel - Re: [PATCH] perf/x86: check ucode before disabling PEBS on SandyBridge

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Message-ID: <20120608140352.GC31359@aftab.osrc.amd.com>
Date:	Fri, 8 Jun 2012 16:03:52 +0200
From:	Borislav Petkov <borislav.petkov@....com>
To:	Peter Zijlstra <peterz@...radead.org>
CC:	Borislav Petkov <borislav.petkov@....com>,
	Ingo Molnar <mingo@...nel.org>,
	Stephane Eranian <eranian@...gle.com>,
	<linux-kernel@...r.kernel.org>, <andi@...stfloor.org>,
	<mingo@...e.hu>, <ming.m.lin@...el.com>,
	Andreas Herrmann <andreas.herrmann3@....com>,
	Dimitri Sivanich <sivanich@....com>,
	Dmitry Adamushko <dmitry.adamushko@...il.com>
Subject: Re: [PATCH] perf/x86: check ucode before disabling PEBS on
 SandyBridge

On Fri, Jun 08, 2012 at 03:56:11PM +0200, Peter Zijlstra wrote:
> >  static __init void intel_sandybridge_quirk(void)
> >  {
> > +       intel_snb_verify_ucode();
> > +       /*
> > +        * we're still single threaded, so while there's a hole here,
> > +        * you can't trigger it.
> > +        */
> > +       microcode_notifier(intel_snb_ucode_notifier);
> >  }
> 
> Like that you mean?

Oh ok, this is regged through x86_add_quirk() in the pmu init code. Yep,
this is what I mean.

-- 
Regards/Gruss,
Boris.

Advanced Micro Devices GmbH
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