* [Bug 42563] rhel5u5 guest panic when booting up
[not found] <bug-42563-28872@https.bugzilla.kernel.org/>
@ 2012-01-12 1:58 ` bugzilla-daemon
2012-01-12 2:11 ` bugzilla-daemon
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From: bugzilla-daemon @ 2012-01-12 1:58 UTC (permalink / raw)
To: kvm
https://bugzilla.kernel.org/show_bug.cgi?id=42563
xudong <xudong.hao@intel.com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |xudong.hao@intel.com
--- Comment #2 from xudong <xudong.hao@intel.com> 2012-01-12 01:58:02 ---
Qemu-kvm used "qemu64" model by default, the level is defined to 4, so only the
0~4 CPUID function is programmed, the PMU function 0xA(Gleb's patch
a0fa82085e...) did not execute at all.
If changes the level to 10 for "qemu64" model and patch a0fa82085e..., RHEL5u5
can boot up.
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2012-01-12 1:58 ` [Bug 42563] rhel5u5 guest panic when booting up bugzilla-daemon
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From: bugzilla-daemon @ 2012-01-12 2:11 UTC (permalink / raw)
To: kvm
https://bugzilla.kernel.org/show_bug.cgi?id=42563
--- Comment #3 from xudong <xudong.hao@intel.com> 2012-01-12 02:11:08 ---
(In reply to comment #1)
> wrmsr 0x186 generates #GP. Can you try loading kvm.ko with ignore_msrs=y and
> retry? ("echo Y > /sys/module/kvm/parameters/ignore_msrs" may do the trick
> too).
I think it should work with ignore_msrs=y, but then we will miss
kvm_pmu_set_msr().
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2012-01-12 1:58 ` [Bug 42563] rhel5u5 guest panic when booting up bugzilla-daemon
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From: bugzilla-daemon @ 2012-01-12 5:41 UTC (permalink / raw)
To: kvm
https://bugzilla.kernel.org/show_bug.cgi?id=42563
--- Comment #4 from Jay Ren <yongjie.ren@intel.com> 2012-01-12 05:41:21 ---
(In reply to comment #1)
> wrmsr 0x186 generates #GP. Can you try loading kvm.ko with ignore_msrs=y and
> retry? ("echo Y > /sys/module/kvm/parameters/ignore_msrs" may do the trick
> too).
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.
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From: bugzilla-daemon @ 2012-01-12 14:02 UTC (permalink / raw)
To: kvm
https://bugzilla.kernel.org/show_bug.cgi?id=42563
--- Comment #5 from Avi Kivity <avi@redhat.com> 2012-01-12 14:02:38 ---
(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.
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From: bugzilla-daemon @ 2012-01-13 7:21 UTC (permalink / raw)
To: kvm
https://bugzilla.kernel.org/show_bug.cgi?id=42563
--- Comment #6 from Gleb <gleb@redhat.com> 2012-01-13 07:21:31 ---
(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.
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From: bugzilla-daemon @ 2012-01-31 1:37 UTC (permalink / raw)
To: kvm
https://bugzilla.kernel.org/show_bug.cgi?id=42563
--- Comment #7 from Jay Ren <yongjie.ren@intel.com> 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@redhat.com>
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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From: bugzilla-daemon @ 2012-01-31 9:39 UTC (permalink / raw)
To: kvm
https://bugzilla.kernel.org/show_bug.cgi?id=42563
--- Comment #8 from Gleb <gleb@redhat.com> 2012-01-31 09:39:50 ---
(In reply to comment #7)
> (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?
Yes.
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From: bugzilla-daemon @ 2012-01-31 9:42 UTC (permalink / raw)
To: kvm
https://bugzilla.kernel.org/show_bug.cgi?id=42563
Jay Ren <yongjie.ren@intel.com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution| |CODE_FIX
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From: bugzilla-daemon @ 2012-01-31 9:42 UTC (permalink / raw)
To: kvm
https://bugzilla.kernel.org/show_bug.cgi?id=42563
Jay Ren <yongjie.ren@intel.com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|RESOLVED |VERIFIED
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From: bugzilla-daemon @ 2012-01-31 9:44 UTC (permalink / raw)
To: kvm
https://bugzilla.kernel.org/show_bug.cgi?id=42563
Jay Ren <yongjie.ren@intel.com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|VERIFIED |CLOSED
--- Comment #9 from Jay Ren <yongjie.ren@intel.com> 2012-01-31 09:44:11 ---
verified and closed it.
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