From: Eugenio Pérez <epere...@redhat.com> This function allows external SVQ users to return guest's available buffers.
Signed-off-by: Eugenio Pérez <epere...@redhat.com> Reviewed-by: Michael S. Tsirkin <m...@redhat.com> Signed-off-by: Jason Wang <jasow...@redhat.com> --- hw/virtio/vhost-shadow-virtqueue.c | 16 ++++++++++++++++ hw/virtio/vhost-shadow-virtqueue.h | 3 +++ 2 files changed, 19 insertions(+) diff --git a/hw/virtio/vhost-shadow-virtqueue.c b/hw/virtio/vhost-shadow-virtqueue.c index 8314405..1669b1f 100644 --- a/hw/virtio/vhost-shadow-virtqueue.c +++ b/hw/virtio/vhost-shadow-virtqueue.c @@ -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) { diff --git a/hw/virtio/vhost-shadow-virtqueue.h b/hw/virtio/vhost-shadow-virtqueue.h index 5c7e7cb..d9fc1f1 100644 --- a/hw/virtio/vhost-shadow-virtqueue.h +++ b/hw/virtio/vhost-shadow-virtqueue.h @@ -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, -- 2.7.4