vring_used
offsetof(struct vring_used, ring) + vq->vq_num *
vq->vq_usedoffset + offsetof(struct vring_used, ring) +
vq->vq_used = (struct vring_used*)(((char*)vq->vq_desc) +
struct vring_used *vq_used;
struct vring_used *used;
used = (struct vring_used *)(vr + vq_info->vq_usedoffset);
struct vring_used *used;
used = (struct vring_used *)(vr + vq_info->vq_usedoffset);
struct vring_used *used;
used = (struct vring_used *)(vr + vq_info->vq_usedoffset);
acct.used = (struct vring_used *)(vr + vq_info->vq_usedoffset);
struct vring_avail *avail, struct vring_used *used, struct vring_desc *desc,
struct vring_used *used = NULL;
used = (struct vring_used *)(vr + vq_info->vq_usedoffset);
struct vring_used *used;