On Tue, 2022-06-21 at 17:34 +0800, Jason Wang wrote: > On Tue, Jun 21, 2022 at 5:24 PM David Hildenbrand <david@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@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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