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

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Date:	Fri, 21 Mar 2014 14:37:53 -0700
From:	Andi Kleen <ak@...ux.intel.com>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	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

On Fri, Mar 21, 2014 at 01:46:04PM -0700, H. Peter Anvin wrote:
> Not really.  That is equally braindamaged.  The problem is that KVM is telling the host that our is something it simply cannot be.

Well it has to pick something. It's unlikely it will ever implement 100% of that particular CPU.
0 is the best you can get in many cases.

Also I thought Xen did return 0.

-Andi
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