static void handle_9p_output(VirtIODevice *vdev, VirtQueue *vq) { V9fsVirtioState *v = (V9fsVirtioState *)vdev; V9fsState *s = &v->state; V9fsPDU *pdu; ssize_t len; while ((pdu = pdu_alloc(s))) { struct { uint32_t size_le; uint8_t id; uint16_t tag_le; } QEMU_PACKED out; VirtQueueElement *elem; elem = virtqueue_pop(vq, sizeof(VirtQueueElement)); if (!elem) { pdu_free(pdu); break; } BUG_ON(elem->out_num == 0 || elem->in_num == 0); QEMU_BUILD_BUG_ON(sizeof(out) != 7); v->elems[pdu->idx] = elem; len = iov_to_buf(elem->out_sg, elem->out_num, 0, &out, sizeof(out)); BUG_ON(len != sizeof(out)); pdu->size = le32_to_cpu(out.size_le); pdu->id = out.id; pdu->tag = le16_to_cpu(out.tag_le); qemu_co_queue_init(&pdu->complete); pdu_submit(pdu); } }