linux-kernel - Re: [V2 PATCH 0/6] x86, NMI: give NMI handler a face-lift

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Message-ID: <1290110660.2109.1529.camel@laptop>
Date:	Thu, 18 Nov 2010 21:04:20 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Jason Wessel <jason.wessel@...driver.com>
Cc:	Don Zickus <dzickus@...hat.com>, Ingo Molnar <mingo@...e.hu>,
	Robert Richter <robert.richter@....com>, ying.huang@...el.com,
	Andi Kleen <andi@...stfloor.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Frederic Weisbecker <fweisbec@...il.com>
Subject: Re: [V2 PATCH 0/6] x86, NMI: give NMI handler a face-lift

On Thu, 2010-11-18 at 13:51 -0600, Jason Wessel wrote:
> I highly doubt we want to disable perf.   I would rather use the source
> and fix the nmi emulation in KVM/Qemu after we hear back the results
> from Cyril because it sounds as if the problem is nearly bottomed out.

Problem is that p6/p4/amd don't have cpuid bits telling us if there is a
PMU (virt should clear those if it doesn't emulate one).

I guess the safest course is to write a pmu msr and see if that faults,
if it does, disable the thing.


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