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 void notify_guest_bh(void *opaque)
{
VirtIOBlockDataPlane *s = opaque;
unsigned nvqs = s->conf->num_queues;
unsigned long bitmap[BITS_TO_LONGS(nvqs)];
unsigned j;
memcpy(bitmap, s->batch_notify_vqs, sizeof(bitmap));
memset(s->batch_notify_vqs, 0, sizeof(bitmap));
for (j = 0; j < nvqs; j += BITS_PER_LONG) {
unsigned long bits = bitmap[j];
while (bits != 0) {
unsigned i = j + ctzl(bits);
VirtQueue *vq = virtio_get_queue(s->vdev, i);
if (virtio_should_notify(s->vdev, vq)) {
event_notifier_set(virtio_queue_get_guest_notifier(vq));
}
bits &= bits - 1; /* clear right-most bit */
}
}
}
/* Context: QEMU global mutex held */
void virtio_blk_data_plane_start(VirtIOBlockDataPlane *s)
{
BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(s->vdev)));
VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus);
VirtIOBlock *vblk = VIRTIO_BLK(s->vdev);
int r;
if (vblk->dataplane_started || s->starting) {
return;
}
s->starting = true;
s->vq = virtio_get_queue(s->vdev, 0);
/* Set up guest notifier (irq) */
r = k->set_guest_notifiers(qbus->parent, 1, true);
if (r != 0) {
fprintf(stderr, "virtio-blk failed to set guest notifier (%d), "
"ensure -enable-kvm is set\n", r);
goto fail_guest_notifiers;
}
s->guest_notifier = virtio_queue_get_guest_notifier(s->vq);
/* Set up virtqueue notify */
r = k->set_host_notifier(qbus->parent, 0, true);
if (r != 0) {
fprintf(stderr, "virtio-blk failed to set host notifier (%d)\n", r);
goto fail_host_notifier;
}
s->starting = false;
vblk->dataplane_started = true;
trace_virtio_blk_data_plane_start(s);
blk_set_aio_context(s->conf->conf.blk, s->ctx);
/* Kick right away to begin processing requests already in vring */
event_notifier_set(virtio_queue_get_host_notifier(s->vq));
/* Get this show started by hooking up our callbacks */
aio_context_acquire(s->ctx);
virtio_queue_aio_set_host_notifier_handler(s->vq, s->ctx,
virtio_blk_data_plane_handle_output);
aio_context_release(s->ctx);
return;
fail_host_notifier:
k->set_guest_notifiers(qbus->parent, 1, false);
fail_guest_notifiers:
vblk->dataplane_disabled = true;
s->starting = false;
vblk->dataplane_started = true;
}
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;
}
static int vhost_virtqueue_init(struct vhost_dev *dev,
struct VirtIODevice *vdev,
struct vhost_virtqueue *vq,
unsigned idx)
{
target_phys_addr_t s, l, a;
int r;
struct vhost_vring_file file = {
.index = idx,
};
struct vhost_vring_state state = {
.index = idx,
};
struct VirtQueue *vvq = virtio_get_queue(vdev, idx);
if (!vdev->binding->set_host_notifier) {
fprintf(stderr, "binding does not support host notifiers\n");
return -ENOSYS;
}
vq->num = state.num = virtio_queue_get_num(vdev, idx);
r = ioctl(dev->control, VHOST_SET_VRING_NUM, &state);
if (r) {
return -errno;
}
state.num = virtio_queue_get_last_avail_idx(vdev, idx);
r = ioctl(dev->control, VHOST_SET_VRING_BASE, &state);
if (r) {
return -errno;
}
s = l = virtio_queue_get_desc_size(vdev, idx);
a = virtio_queue_get_desc_addr(vdev, idx);
vq->desc = cpu_physical_memory_map(a, &l, 0);
if (!vq->desc || l != s) {
r = -ENOMEM;
goto fail_alloc_desc;
}
s = l = virtio_queue_get_avail_size(vdev, idx);
a = virtio_queue_get_avail_addr(vdev, idx);
vq->avail = cpu_physical_memory_map(a, &l, 0);
if (!vq->avail || l != s) {
r = -ENOMEM;
goto fail_alloc_avail;
}
vq->used_size = s = l = virtio_queue_get_used_size(vdev, idx);
vq->used_phys = a = virtio_queue_get_used_addr(vdev, idx);
vq->used = cpu_physical_memory_map(a, &l, 1);
if (!vq->used || l != s) {
r = -ENOMEM;
goto fail_alloc_used;
}
vq->ring_size = s = l = virtio_queue_get_ring_size(vdev, idx);
vq->ring_phys = a = virtio_queue_get_ring_addr(vdev, idx);
vq->ring = cpu_physical_memory_map(a, &l, 1);
if (!vq->ring || l != s) {
r = -ENOMEM;
goto fail_alloc_ring;
}
r = vhost_virtqueue_set_addr(dev, vq, idx, dev->log_enabled);
if (r < 0) {
r = -errno;
goto fail_alloc;
}
r = vdev->binding->set_host_notifier(vdev->binding_opaque, idx, true);
if (r < 0) {
fprintf(stderr, "Error binding host notifier: %d\n", -r);
goto fail_host_notifier;
}
file.fd = event_notifier_get_fd(virtio_queue_get_host_notifier(vvq));
r = ioctl(dev->control, VHOST_SET_VRING_KICK, &file);
if (r) {
r = -errno;
goto fail_kick;
}
file.fd = event_notifier_get_fd(virtio_queue_get_guest_notifier(vvq));
r = ioctl(dev->control, VHOST_SET_VRING_CALL, &file);
if (r) {
r = -errno;
goto fail_call;
}
return 0;
fail_call:
fail_kick:
vdev->binding->set_host_notifier(vdev->binding_opaque, idx, false);
fail_host_notifier:
fail_alloc:
cpu_physical_memory_unmap(vq->ring, virtio_queue_get_ring_size(vdev, idx),
0, 0);
fail_alloc_ring:
cpu_physical_memory_unmap(vq->used, virtio_queue_get_used_size(vdev, idx),
0, 0);
fail_alloc_used:
cpu_physical_memory_unmap(vq->avail, virtio_queue_get_avail_size(vdev, idx),
0, 0);
fail_alloc_avail:
cpu_physical_memory_unmap(vq->desc, virtio_queue_get_desc_size(vdev, idx),
0, 0);
fail_alloc_desc:
return r;
}
void virtio_scsi_dataplane_notify(VirtIODevice *vdev, VirtIOSCSIReq *req)
{
if (virtio_should_notify(vdev, req->vq)) {
event_notifier_set(virtio_queue_get_guest_notifier(req->vq));
}
}