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

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Message-ID: <20140321192938.GJ3132@tassilo.jf.intel.com>
Date:	Fri, 21 Mar 2014 12:29:38 -0700
From:	Andi Kleen <ak@...ux.intel.com>
To:	Peter Wu <peter@...ensteyn.nl>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...nel.org>, linux-kernel@...r.kernel.org,
	"H. Peter Anvin" <hpa@...or.com>
Subject: Re: GPF in intel_pmu_lbr_reset() with qemu -cpu host

On Fri, Mar 21, 2014 at 06:42:40PM +0100, Peter Wu wrote:
> Hi,
> 
> While trying to run QEMU with `-enable-kvm -host cpu`, I get a GPF in
> intel_pmu_lbr_reset():

Same problem as the RAPL problem earlier. KVM is lying to the guest 
that it is a host CPU, but not implementing all MSRs the host
CPU supports.

KVM should really return 0 on unknown MSRs not #GP

-Andi
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