static int vhost_net_start_one(struct vhost_net *net, VirtIODevice *dev, int vq_index) { struct vhost_vring_file file = { }; int r; if (net->dev.started) { return 0; } net->dev.nvqs = 2; net->dev.vqs = net->vqs; net->dev.vq_index = vq_index; r = vhost_dev_enable_notifiers(&net->dev, dev); if (r < 0) { goto fail_notifiers; } r = vhost_dev_start(&net->dev, dev); if (r < 0) { goto fail_start; } if (net->nc->info->poll) { net->nc->info->poll(net->nc, false); } if (net->nc->info->type == NET_CLIENT_OPTIONS_KIND_TAP) { qemu_set_fd_handler(net->backend, NULL, NULL, NULL); file.fd = net->backend; for (file.index = 0; file.index < net->dev.nvqs; ++file.index) { const VhostOps *vhost_ops = net->dev.vhost_ops; r = vhost_ops->vhost_call(&net->dev, VHOST_NET_SET_BACKEND, &file); if (r < 0) { r = -errno; goto fail; } } } return 0; fail: file.fd = -1; if (net->nc->info->type == NET_CLIENT_OPTIONS_KIND_TAP) { while (file.index-- > 0) { const VhostOps *vhost_ops = net->dev.vhost_ops; int r = vhost_ops->vhost_call(&net->dev, VHOST_NET_SET_BACKEND, &file); assert(r >= 0); } } if (net->nc->info->poll) { net->nc->info->poll(net->nc, true); } vhost_dev_stop(&net->dev, dev); fail_start: vhost_dev_disable_notifiers(&net->dev, dev); fail_notifiers: return r; }