[Bug 42563] rhel5u5 guest panic when booting up

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https://bugzilla.kernel.org/show_bug.cgi?id=42563





--- Comment #7 from Jay Ren <yongjie.ren@xxxxxxxxx>  2012-01-31 01:37:57 ---
(In reply to comment #6)
> (In reply to comment #5)
> > (In reply to comment #4)
> > 
> > > Yes. With 'ignore_msrs=y' added when loading kvm module, rhel5.x guest can boot
> > > up now. As it will effect all the RHEL5.x (e.g.5.3, 5.3) guest, this issue
> > > still need to be fixed.
> > 
> > Agree.  Gleb, I think we need to restore the perf msrs behaviour to what it was
> > before, when the PMU is not enabled.
> 
> Yes, they were special cased for a reason.

I found the bug got fixed in kvm upstream. Gleb, you fixed it by the following
commit? 

commit 7f85a520ba8407af6384aac32d829988ab543ebf
Author: Gleb Natapov <gleb@xxxxxxxxxx>
Date:   Sun Jan 15 14:17:22 2012 +0200

    KVM: do not #GP on perf MSR writes when vPMU is disabled

    Return to behaviour perf MSR had before introducing vPMU in case vPMU
    is disabled. Some guests access those registers unconditionally and do
    not expect it to fail.

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