Re: kvm-88: KVM_APIC_READ: read reserved register b0

[Gleb Natapov <gleb@redhat.com>]

On Sun, Aug 30, 2009 at 11:59:27AM +0200, Christoph Lechner wrote:
> Daniel Bareiro wrote:
> > On Friday, 28 August 2009 12:04:02 +0200,
> > Christoph Lechner wrote:
> > 
> >> Hi all,
> > 
> > Hi Christoph.
> Hi.
> >  
> >> running kvm-88 on a 2.6.26-1-amd64 kernel (stock Debian 5.0 kernel), I
> >> get the syslog on the host system flooded with the message:
> >>
> >> Aug 28 11:49:40 reactor kernel: [124035.611782] KVM_APIC_READ: read
> >> reserved register b0
> >>
> >> [...]
> > 
> > Also I am observing this behavior in one of my hosts with KVM-88 and
> > Linux 2.6.30 compiled both by myself on Ubuntu GNU/Linux Hardy Heron
> > server amd64, as I've mentioned in a previous [1] mail. Guests has
> > Debian GNU/Linux Lenny with stock kernel 2.6.26.
> > 
> > I was trying if with model=virtio the problem were solved, but was not
> > successful. It would seem that the cause is due to something related to
> > hardware of the host (is it possible?), since I have other hosts in
> > which I use both the same version of KVM and kernel, also both compiled
> > by myself, and I'm not having this problem.
> 
> don't know if this is caused by the host hardware. But what I forgot to
> mention: I commented out the printk call in lapic.c. This stopped the
> flooding, but I know it's only a work around.
> 
This printk no longer exists in upstream kvm.

--
			Gleb.