VIRTIO_PCI_QUEUE_NOTIFY is used to inform availability of new buffers, so wakeup the iothread to process that information immediately.
Reported-by: Amit Shah <amit.s...@redhat.com> Signed-off-by: Marcelo Tosatti <mtosa...@redhat.com> Index: qemu/hw/virtio-pci.c =================================================================== --- qemu.orig/hw/virtio-pci.c +++ qemu/hw/virtio-pci.c @@ -204,6 +204,7 @@ static void virtio_ioport_write(void *op break; case VIRTIO_PCI_QUEUE_NOTIFY: virtio_queue_notify(vdev, val); + qemu_notify_event(); break; case VIRTIO_PCI_STATUS: vdev->status = val & 0xFF;