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[Qemu-devel] Re: virtio breakage with 2.6.25 guest kernel
From: |
Mark McLoughlin |
Subject: |
[Qemu-devel] Re: virtio breakage with 2.6.25 guest kernel |
Date: |
Wed, 14 Jan 2009 09:22:58 +0000 |
On Tue, 2009-01-13 at 22:05 +0100, Alexander Graf wrote:
> On 13.01.2009, at 21:14, Anthony Liguori <address@hidden> wrote:
>
> > Alexander Graf wrote:
> >> Hi,
> >>
> >> while I don't fully understand the problem, here's what I
> >> experience so far:
> >>
> >> When using an openSUSE 11.0 kernel (2.6.25) in the guest, virtio on
> >> tap
> >> breaks with current KVM git, while it used to work before (haven't
> >> bisected, definitely worked in kvm-78, but is probably due to
> >> Anthony's
> >> rewrite). It shows the following message (comes from qemu):
> >>
> >
> > There were a couple of old-guest-breaking regressions. I think
> > we've fixed all of them but there could be more. Are you using the
> > latest kvm-userspace?
See:
http://lists.gnu.org/archive/html/qemu-devel/2009-01/msg00574.html
> This one is definitely due to the broken guest kernel. I applied the
> patch mark mentioned to ours and things started working.
>
> So the only way I can think of to 'fix' it is by detecting broken
> guests. We could supply a host mask of 0xffffffff and see if tge guest
> feature mask is tge same. If so, feature masking is probably broken.
Nice idea, but no way of making the guest through feature detection
negotiation, I don't think.
Cheers,
Mark.