On Tue, 2022-06-21 at 17:34 +0800, Jason Wang wrote:> On Tue, Jun 21, 2022 at 5:24 PM David Hildenbrand <david at
redhat.com> wrote:
> >
> > On 20.06.22 20:49, Ben Hutchings wrote:
> > > I've tested a 5.19-rc3 kernel on top of QEMU/KVM with machine
type
> > > pc-q35-5.2. It has a virtio balloon device defined in libvirt
as:
> > >
> > > <memballoon model="virtio">
> > > <address type="pci" domain="0x0000"
bus="0x05" slot="0x00" function="0x0"/>
> > > </memballoon>
> > >
> > > but the virtio_balloon driver fails to bind to it:
> > >
> > > virtio_balloon virtio4: init_vqs: add stat_vq failed
> > > virtio_balloon: probe of virtio4 failed with error -5
> > >
> >
> > Hmm, I don't see any recent changes to
drivers/virtio/virtio_balloon.c
> >
> > virtqueue_add_outbuf() fails with -EIO if I'm not wrong.
That's the
> > first call of virtqueue_add_outbuf() when virtio_balloon initializes.
> >
> >
> > Maybe something in generic virtio code changed?
>
> Yes, we introduced the IRQ hardening. That could be the root cause and
> we've received lots of reports so we decide to disable it by default.
>
> Ben, could you please try this patch: (and make sure
> CONFIG_VIRTIO_HARDEN_NOTIFICATION is not set)
>
> https://lore.kernel.org/lkml/20220620024158.2505-1-jasowang at
redhat.com/T/
Yes, that patch fixes the regression for me.
Ben.
--
Ben Hutchings
Any smoothly functioning technology is indistinguishable
from a rigged demo.
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