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

H. Peter Anvin
2014-03-21T20:47:29Z

Not really. That is equally braindamaged. The problem is that KVM is telling the host that our is something it simply cannot be.

On March 21, 2014 12:29:38 PM PDT, Andi Kleen <ak@linux.intel.com> wrote:
>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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