static int virtio_mmio_set_guest_notifier(DeviceState *d, int n, bool assign,
bool with_irqfd)
{
VirtIOMMIOProxy *proxy = VIRTIO_MMIO(d);
VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
VirtioDeviceClass *vdc = VIRTIO_DEVICE_GET_CLASS(vdev);
VirtQueue *vq = virtio_get_queue(vdev, n);
EventNotifier *notifier = virtio_queue_get_guest_notifier(vq);
if (assign) {
int r = event_notifier_init(notifier, 0);
if (r < 0) {
return r;
}
virtio_queue_set_guest_notifier_fd_handler(vq, true, with_irqfd);
} else {
virtio_queue_set_guest_notifier_fd_handler(vq, false, with_irqfd);
event_notifier_cleanup(notifier);
}
if (vdc->guest_notifier_mask && vdev->use_guest_notifier_mask) {
vdc->guest_notifier_mask(vdev, n, !assign);
}
return 0;
}
static int virtio_ccw_set_guest_notifier(VirtioCcwDevice *dev, int n,
bool assign, bool with_irqfd)
{
VirtQueue *vq = virtio_get_queue(dev->vdev, n);
EventNotifier *notifier = virtio_queue_get_guest_notifier(vq);
VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(dev->vdev);
if (assign) {
int r = event_notifier_init(notifier, 0);
if (r < 0) {
return r;
}
virtio_queue_set_guest_notifier_fd_handler(vq, true, with_irqfd);
/* We do not support irqfd for classic I/O interrupts, because the
* classic interrupts are intermixed with the subchannel status, that
* is queried with test subchannel. We want to use vhost, though.
* Lets make sure to have vhost running and wire up the irq fd to
* land in qemu (and only the irq fd) in this code.
*/
if (k->guest_notifier_mask) {
k->guest_notifier_mask(dev->vdev, n, false);
}
/* get lost events and re-inject */
if (k->guest_notifier_pending &&
k->guest_notifier_pending(dev->vdev, n)) {
event_notifier_set(notifier);
}
} else {
if (k->guest_notifier_mask) {
k->guest_notifier_mask(dev->vdev, n, true);
}
virtio_queue_set_guest_notifier_fd_handler(vq, false, with_irqfd);
event_notifier_cleanup(notifier);
}
return 0;
}