On Mon, Jul 29, 2013 at 10:50:00PM +0200, Stefan Pietsch wrote:
> On 29.07.2013 11:16, Gleb Natapov wrote:
> > On Mon, Jul 29, 2013 at 11:09:51AM +0200, Stefan Pietsch wrote:
> >> On 26.07.2013 20:39, Gleb Natapov wrote:
> >>> On Fri, Jul 26, 2013 at 08:25:19PM +0200, Stefan Pietsch wrote:
> >>>> Hi all,
> >>>>
> >>>> starting a virtual machine (Debian sid) with KVM on my host running
> >>>> kernel 3.10.1 (Debian 3.10-1-686-pae) produces these messages:
> >>>>
> >>> Are those messages printed by a host or a guest?
> >>
> >> The host shows the messages.
> >>
> >>>> [ 765.522920] Uhhuh. NMI received for unknown reason 31 on CPU 0.
> >>>> [ 765.522927] Do you have a strange power saving mode enabled?
> >>>> [ 765.522930] Dazed and confused, but trying to continue
> >>>> [ 770.487732] Uhhuh. NMI received for unknown reason 21 on CPU 0.
> >>>> [ 770.487740] Do you have a strange power saving mode enabled?
> >>>> [ 770.487742] Dazed and confused, but trying to continue
> >>>> [ 846.340966] Uhhuh. NMI received for unknown reason 31 on CPU 1.
> >>>> [ 846.340973] Do you have a strange power saving mode enabled?
> >>>> [ 846.340976] Dazed and confused, but trying to continue
> >>>> [ 847.563023] Uhhuh. NMI received for unknown reason 31 on CPU 0.
> >>>> [ 847.563029] Do you have a strange power saving mode enabled?
> >>>> [ 847.563032] Dazed and confused, but trying to continue
> >>
> >> Is it safe to ignore them?
> >>
> > They should not happen. What is the last kernel version you tried that
> > does not produce them? Can you verify that they do not happen without
> > guest running? What is the qemu command line you are using to start the
> > guest and what "cat /proc/cpuinfo" looks like in the guest?
>
> The Debian wheezy kernel (3.2.46) does not show this behaviour.
> It is directly related to KVM and I found out that replacing the option
> "-cpu coreduo" with "-cpu kvm32" does not generate the NMI messages.
>
What happen if you run perf on your host (perf record -a)?
Do you see same NMI messages?
--
Gleb.
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