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SubjectRe: [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

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