+int
+vring_translate(struct virtio_net *dev, struct vhost_virtqueue *vq)
+{
+ uint64_t req_size, size;
+
+ if (!(dev->features & (1ULL << VIRTIO_F_IOMMU_PLATFORM)))
+ goto out;
+
+ req_size = sizeof(struct vring_desc) * vq->size;
+ size = req_size;
+ vq->desc = (struct vring_desc *)(uintptr_t)vhost_iova_to_vva(dev, vq,
+ vq->ring_addrs.desc_user_addr,
+ &size, VHOST_ACCESS_RW);
+ if (!vq->desc || size != req_size)
+ return -1;
+
+ req_size = sizeof(struct vring_avail);
+ req_size += sizeof(uint16_t) * vq->size;
+ if (dev->features & (1ULL << VIRTIO_RING_F_EVENT_IDX))
+ req_size += sizeof(uint16_t);
+ size = req_size;
+ vq->avail = (struct vring_avail *)(uintptr_t)vhost_iova_to_vva(dev, vq,
+ vq->ring_addrs.avail_user_addr,
+ &size, VHOST_ACCESS_RW);
+ if (!vq->avail || size != req_size)
+ return -1;
+
+ req_size = sizeof(struct vring_used);
+ req_size += sizeof(struct vring_used_elem) * vq->size;
+ if (dev->features & (1ULL << VIRTIO_RING_F_EVENT_IDX))
+ req_size += sizeof(uint16_t);
+ size = req_size;
+ vq->used = (struct vring_used *)(uintptr_t)vhost_iova_to_vva(dev, vq,
+ vq->ring_addrs.used_user_addr,
+ &size, VHOST_ACCESS_RW);
+ if (!vq->used || size != req_size)
+ return -1;
+
+out:
+ vq->access_ok = 1;
+
+ return 0;
+}
+
+void
+vring_invalidate(struct virtio_net *dev, struct vhost_virtqueue *vq)
+{
+ if (dev->features & (1ULL << VIRTIO_F_IOMMU_PLATFORM))
+ vhost_user_iotlb_wr_lock(vq);
+
+ vq->access_ok = 0;
+ vq->desc = NULL;
+ vq->avail = NULL;
+ vq->used = NULL;
+
+ if (dev->features & (1ULL << VIRTIO_F_IOMMU_PLATFORM))
+ vhost_user_iotlb_wr_unlock(vq);
+}
+