Re: [RFC 0/4] Virtio uses DMA API for all devices

[Gerd Hoffmann]

> > this to set the VIRTIO_F_IOMMU_PLATFORM flag. But for example
> > QEMU has the use of iommu_platform attribute disabled for virtio-gpu
> > device.  So would also like to move towards not having to specify
> > the VIRTIO_F_IOMMU_PLATFORM flag.
> 
> Specifying VIRTIO_F_IOMMU_PLATFORM is the right thing for your 
> platform given that you can't directly use physical addresses.
> Please fix qemu so that virtio-gpu works with VIRTIO_F_IOMMU_PLATFORM.

This needs both host and guest side changes btw.

Guest side patch is in drm-misc (a3b815f09bb8) and should land in the
next merge window.

Host side patches are here:
  https://git.kraxel.org/cgit/qemu/log/?h=sirius/virtio-gpu-iommu

Should also land in the next qemu version.

cheers,
  Gerd