Re: Bug#707257: linux-image-3.8-1-686-pae: KVM crashes with "entry failed, hardware error 0x80000021"

[Gleb Natapov <gleb@redhat.com>]

On Mon, Jun 24, 2013 at 01:43:26PM +0200, Stefan Pietsch wrote:
> On 23.06.2013 19:36, Gleb Natapov wrote:
> > On Sun, Jun 23, 2013 at 06:51:30PM +0200, Stefan Pietsch wrote:
> >> On 23.06.2013 09:51, Gleb Natapov wrote:
> >>> On Thu, Jun 20, 2013 at 07:01:49PM +0200, Stefan Pietsch wrote:
> >>>>> Can you provide the output of 25391454e73e3156202264eb3c473825afe4bc94
> >>>>> and emulate_invalid_guest_state=0. Also run "x/20i $pc-20" in qemu
> >>>>> monitor after the hang.
> >>>>
> >>>>
> >>>> 25391454e73e3156202264eb3c473825afe4bc94
> >>>>  emulate_invalid_guest_state=0
> >>>>
> >>> Very interesting. Looks like somewhere during TPR access FS
> >>> register gets corrupted. Can you remove /usr/share/kvm/kvmvapic.bin
> >>> and try again? This will disable some code paths during TPR access and
> >>> will narrow down the issue.
> >>
> >>
> >> Doing this, qemu complains
> >> "Could not open option rom 'kvmvapic.bin': No such file or directory",
> >> but the virtual machine boots successful with
> >> emulate_invalid_guest_state=0 and emulate_invalid_guest_state=1.
> >>
> > Hmm, I think we ate close. Can you try with upstream qemu?
> > 
> >> kvmvapic.bin comes with Debian package "seabios 1.7.2-3".
> 
> I already tried this with the Debian package qemu-kvm 1.5.0+dfsg-4.
And it didn't work? Mind trying some debug kernel patches? I suspect
your CPU does something no CPU I have do, so I want to verify it.

--
			Gleb.