- dev->virtqueue[msg->payload.state.index]->last_used_idx =
- msg->payload.state.num;
- dev->virtqueue[msg->payload.state.index]->last_avail_idx =
- msg->payload.state.num;
+ struct vhost_virtqueue *vq = dev->virtqueue[msg->payload.state.index];
+ uint64_t val = msg->payload.state.num;
+
+ if (vq_is_packed(dev)) {
+ /*
+ * Bit[0:14]: avail index
+ * Bit[15]: avail wrap counter
+ */
+ vq->last_avail_idx = val & 0x7fff;
+ vq->avail_wrap_counter = !!(val & (0x1 << 15));
+ /*
+ * Set used index to same value as available one, as
+ * their values should be the same since ring processing
+ * was stopped at get time.
+ */
+ vq->last_used_idx = vq->last_avail_idx;
+ vq->used_wrap_counter = vq->avail_wrap_counter;
+ } else {
+ vq->last_used_idx = msg->payload.state.num;
+ vq->last_avail_idx = msg->payload.state.num;
+ }