linux-kernel - Re: GPF in intel_pmu_lbr_reset() with qemu -cpu host

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Message-ID: <20140322002244.GP22728@two.firstfloor.org>
Date:	Sat, 22 Mar 2014 01:22:44 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Andi Kleen <andi@...stfloor.org>, Peter Wu <peter@...ensteyn.nl>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...nel.org>, linux-kernel@...r.kernel.org
Subject: Re: GPF in intel_pmu_lbr_reset() with qemu -cpu host

> Actually, Ingo, Borislav and I have been discussing making rdmsr_safe()
> more of the default, especially for things like this where the error
> handling is obvious (doesn't work?  Disable the PMU.)

That would be completely wrong. KVM has a full architectural perfmon PMU,
just no model specific extensions like LBR.

-Andi


-- 
ak@...ux.intel.com -- Speaking for myself only.
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