Re: [virtio-dev] [PATCH 2/2] drm/virtio: add iommu support.

[Gerd Hoffmann]

  Hi,

> > Just pass it down, the call sites all know it (see patch just sent).
> 
> Tested that patch you sent.  Together with this patch it also resolves
> the virtio gpu graphical display issue for SEV guest.

Cool.  Can you ack or review the patch so I can commit it?

> Is there a way to optimize the dma_sync_sg to only sync on the pages
> being updated instead of all the pages in the obj sgl list every time?

Well, the rectangle is passed to virtio_gpu_cmd_transfer_to_host_2d, so
it should be possible to figure which pages are affected and trim the
scatter list accordingly.

cheers,
  Gerd