@@ -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,
@@ -427,6 +427,22 @@ 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)
{
This function allows external SVQ users to return guest's available buffers. Signed-off-by: Eugenio PĂ©rez <eperezma@redhat.com> --- hw/virtio/vhost-shadow-virtqueue.h | 3 +++ hw/virtio/vhost-shadow-virtqueue.c | 16 ++++++++++++++++ 2 files changed, 19 insertions(+)