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vhost: add vhost_svq_push_elem

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This function allows external SVQ users to return guest's available
buffers.

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 08:59:36 +02:00 committed by Jason Wang
parent ac4cfdc6f3
commit 432efd144e
2 changed files with 19 additions and 0 deletions
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16
hw/virtio/vhost-shadow-virtqueue.c
View File

@ -428,6 +428,22 @@ static VirtQueueElement *vhost_svq_get_buf(VhostShadowVirtqueue *svq,
return g_steal_pointer(&svq->desc_state[used_elem.id].elem);
}
/**
* Push an element to SVQ, returning it to the guest.
*/
void vhost_svq_push_elem(VhostShadowVirtqueue *svq,
const VirtQueueElement *elem, uint32_t len)
{
virtqueue_push(svq->vq, elem, len);
if (svq->next_guest_avail_elem) {
/*
* Avail ring was full when vhost_svq_flush was called, so it's a
* good moment to make more descriptors available if possible.
*/
vhost_handle_guest_kick(svq);
}
}
static void vhost_svq_flush(VhostShadowVirtqueue *svq,
bool check_for_avail_queue)
{

3
hw/virtio/vhost-shadow-virtqueue.h
View File

@ -84,6 +84,9 @@ typedef struct VhostShadowVirtqueue {
bool vhost_svq_valid_features(uint64_t features, Error **errp);
void vhost_svq_push_elem(VhostShadowVirtqueue *svq,
const VirtQueueElement *elem, uint32_t len);
void vhost_svq_set_svq_kick_fd(VhostShadowVirtqueue *svq, int svq_kick_fd);
void vhost_svq_set_svq_call_fd(VhostShadowVirtqueue *svq, int call_fd);
void vhost_svq_get_vring_addr(const VhostShadowVirtqueue *svq,