bool vring_setup(Vring *vring, VirtIODevice *vdev, int n) { hwaddr vring_addr = virtio_queue_get_ring_addr(vdev, n); hwaddr vring_size = virtio_queue_get_ring_size(vdev, n); void *vring_ptr; vring->broken = false; hostmem_init(&vring->hostmem); vring_ptr = hostmem_lookup(&vring->hostmem, vring_addr, vring_size, true); if (!vring_ptr) { error_report("Failed to map vring " "addr %#" HWADDR_PRIx " size %" HWADDR_PRIu, vring_addr, vring_size); vring->broken = true; return false; } vring_init(&vring->vr, virtio_queue_get_num(vdev, n), vring_ptr, 4096); vring->last_avail_idx = 0; vring->last_used_idx = 0; vring->signalled_used = 0; vring->signalled_used_valid = false; trace_vring_setup(virtio_queue_get_ring_addr(vdev, n), vring->vr.desc, vring->vr.avail, vring->vr.used); return true; }