vring_init
vring_init(&vring_split->vring, num, queue, vring_align);
vring_init(&vring_split.vring, num, pages, vring_align);
vring_init(&ring, ring_size, p, 0x1000);
vring_init(&info->vring, num, info->ring, 4096);
vring_init(&info->vring, num, info->ring, 4096);
vring_init(&vrh.vring, RINGSIZE, host_map, ALIGN);
vring_init(&vrh.vring, RINGSIZE, __user_addr_min, ALIGN);
vring_init(&vring, RINGSIZE, __user_addr_min, ALIGN);