Use the dma mapping api and properly add iommu mappings for
objects, unless virtio is in iommu quirk mode.
Signed-off-by: NGerd Hoffmann <kraxel@redhat.com>
Reviewed-by: NDave Airlie <airlied@redhat.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20180829122026.27012-3-kraxel@redhat.com