Virtualization - Jul 2022 - [PATCH v7 7/9] drm/virtio: Improve DMA API usage for shmem BOs

Hi,
> > Also note that pci is not the only virtio transport we have.
> 
> The VirtIO indeed has other transports, but only PCI is really supported
> in case of the VirtIO-GPU in kernel and in Qemu/crosvm, AFAICT. Hence
> only the PCI transport was tested.
qemu -M microvm \
  -global virtio-mmio.force-legacy=false \
  -device virtio-gpu-device

Gives you a functional virtio-gpu device on virtio-mmio.

aarch64 virt machines support both pci and mmio too.
s390x has virtio-gpu-ccw ...

take care,
  Gerd