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vhost: Add svq avail_handler callback

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This allows external handlers to be aware of new buffers that the guest
places in the virtqueue.

When this callback is defined the ownership of the guest's virtqueue
element is transferred to the callback. This means that if the user
wants to forward the descriptor it needs to manually inject it. The
callback is also free to process the command by itself and use the
element with svq_push.

Signed-off-by: Eugenio Pérez <eperezma@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
This commit is contained in:
Eugenio Pérez 2022-07-20 08:59:39 +02:00 • committed by Jason Wang
parent 3f44d13dda
commit e966c0b781
3 changed files with 44 additions and 4 deletions
Download patch file Download diff file Expand all files Collapse all files

14
hw/virtio/vhost-shadow-virtqueue.c
View file

@ -306,7 +306,11 @@ static void vhost_handle_guest_kick(VhostShadowVirtqueue *svq)
break;
}
r = vhost_svq_add_element(svq, elem);
if (svq->ops) {
r = svq->ops->avail_handler(svq, elem, svq->ops_opaque);
} else {
r = vhost_svq_add_element(svq, elem);
}
if (unlikely(r != 0)) {
if (r == -ENOSPC) {
/*
@ -685,12 +689,16 @@ void vhost_svq_stop(VhostShadowVirtqueue *svq)
* shadow methods and file descriptors.
*
* @iova_tree: Tree to perform descriptors translations
* @ops: SVQ owner callbacks
* @ops_opaque: ops opaque pointer
*
* Returns the new virtqueue or NULL.
*
* In case of error, reason is reported through error_report.
*/
VhostShadowVirtqueue *vhost_svq_new(VhostIOVATree *iova_tree)
VhostShadowVirtqueue *vhost_svq_new(VhostIOVATree *iova_tree,
const VhostShadowVirtqueueOps *ops,
void *ops_opaque)
{
g_autofree VhostShadowVirtqueue *svq = g_new0(VhostShadowVirtqueue, 1);
int r;
@ -712,6 +720,8 @@ VhostShadowVirtqueue *vhost_svq_new(VhostIOVATree *iova_tree)
event_notifier_init_fd(&svq->svq_kick, VHOST_FILE_UNBIND);
event_notifier_set_handler(&svq->hdev_call, vhost_svq_handle_call);
svq->iova_tree = iova_tree;
svq->ops = ops;
svq->ops_opaque = ops_opaque;
return g_steal_pointer(&svq);
err_init_hdev_call: