Virtualization - Sep 2018 - [virtio-dev] [PATCH 2/2] drm/virtio: add iommu support.

> >> Once display manger is kicked off for example (sudo systemctl
start lightdm.service) and
> >> resource id 3 gets created from user space down, it still gives a
blank black screen.
> > 
> > Hmm.  I'd suspect there is simply a code path missing.  Can you
send the
> > patch you have?
> > 
> > cheers,
> >   Gerd
> > 
> 
> I sent the patch.  For now it does dma_sync_sg on the pages in 
> TRANSFER_TO_HOST_2D/3D when use_dma_api is true.
> 
> https://lore.kernel.org/lkml/20180919070931.91168-1-jiandi.an at amd.com/
Hmm, the way it is hooked up it should not miss any resource update.
So not sure why it isn't working.
Pushed the patch nevertheless as it is clearly a step into the right
direction.

cheers,
  Gerd