+
+/*
+ * Converts ring address to Vhost virtual address.
+ * If IOMMU is enabled, the ring address is a guest IO virtual address,
+ * else it is a QEMU virtual address.
+ */
+static uint64_t
+ring_addr_to_vva(struct virtio_net *dev, struct vhost_virtqueue *vq,
+ uint64_t ra, uint64_t size)
+{
+ if (dev->features & (1ULL << VIRTIO_F_IOMMU_PLATFORM)) {
+ uint64_t vva;
+
+ vva = vhost_user_iotlb_cache_find(vq, ra,
+ &size, VHOST_ACCESS_RW);
+ if (!vva)
+ vhost_user_iotlb_miss(dev, ra, VHOST_ACCESS_RW);
+
+ return vva;
+ }
+
+ return qva_to_vva(dev, ra);
+}
+