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. -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
