vhost: Expose vhost_svq_available_slots()

Next patches in this series will delay the polling and checking of buffers until either the SVQ is full or control commands shadow buffers are full, no longer perform an immediate poll and check of the device's used buffers for each CVQ state load command. To achieve this, this patch exposes vhost_svq_available_slots(), allowing QEMU to know whether the SVQ is full. Signed-off-by: Hawkins Jiawei <yin31149@gmail.com> Acked-by: Eugenio Pérez <eperezma@redhat.com> Message-Id: <25938079f0bd8185fd664c64e205e629f7a966be.1697165821.git.yin31149@gmail.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
qemu · Oct 18, 2023 · 99d6a32 · 99d6a32
1 parent 1d7e2a8
commit 99d6a32
Show file tree

Hide file tree

Showing 2 changed files with 2 additions and 1 deletion.
diff --git a/hw/virtio/vhost-shadow-virtqueue.c b/hw/virtio/vhost-shadow-virtqueue.c
@@ -66,7 +66,7 @@ bool vhost_svq_valid_features(uint64_t features, Error **errp)
  *
  * @svq: The svq
  */
-static uint16_t vhost_svq_available_slots(const VhostShadowVirtqueue *svq)
+uint16_t vhost_svq_available_slots(const VhostShadowVirtqueue *svq)
 {
     return svq->num_free;
 }

diff --git a/hw/virtio/vhost-shadow-virtqueue.h b/hw/virtio/vhost-shadow-virtqueue.h
@@ -114,6 +114,7 @@ typedef struct VhostShadowVirtqueue {
 
 bool vhost_svq_valid_features(uint64_t features, Error **errp);
 
+uint16_t vhost_svq_available_slots(const VhostShadowVirtqueue *svq);
 void vhost_svq_push_elem(VhostShadowVirtqueue *svq,
                          const VirtQueueElement *elem, uint32_t len);
 int vhost_svq_add(VhostShadowVirtqueue *svq, const struct iovec *out_sg,