[Qemu-devel] [Bug 1771042] [NEW] dataplane interrupt handler doesn't support msi

[eric hoffman]

Public bug reported:

hw/block/dataplane/virtio-blk.c commit
1010cadf62332017648abee0d7a3dc7f2eef9632

in the function notify_guest_bh, the function virtio_notify_irqfd is called
to deliver the interrupt corresponding to the vq

however, without the dataplane, hw/block/virtio_blk_req_complete calls
virtio_notify to deliver the interrupt (immediately). this goes though
a slightly more involved path that calls virtio_pci_notify which includes
a case to handle msi interrupts.

so, msi interrupts with block devices aren't serviced when using dataplane
batching.

** Affects: qemu
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1771042

Title:
  dataplane interrupt handler doesn't support msi

Status in QEMU:
  New

Bug description:
  hw/block/dataplane/virtio-blk.c commit
  1010cadf62332017648abee0d7a3dc7f2eef9632

  in the function notify_guest_bh, the function virtio_notify_irqfd is called
  to deliver the interrupt corresponding to the vq

  however, without the dataplane, hw/block/virtio_blk_req_complete calls
  virtio_notify to deliver the interrupt (immediately). this goes though
  a slightly more involved path that calls virtio_pci_notify which includes
  a case to handle msi interrupts.

  so, msi interrupts with block devices aren't serviced when using dataplane
  batching.

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