On 7/5/22 18:45, Gerd Hoffmann wrote: > 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 ... Gerd, thank you very much! It's was indeed unclear to me how to test the MMIO GPU, but yours variant with microvm works! I was looking for trying aarch64 in the past, but it also was unclear how to do it since there is no DT support for the VirtIO-GPU, AFAICS. I booted kernel with this patchset applied and everything is okay, Xorg works. [drm] Initialized virtio_gpu 0.1.0 0 for LNRO0005:01 on minor 0 virtio-mmio LNRO0005:01: [drm] drm_plane_enable_fb_damage_clips() not called virtio-mmio LNRO0005:01: [drm] fb0: virtio_gpudrmfb frame buffer device There is no virgl support because it's a virtio-gpu-device and not virtio-gpu-device-gl that is PCI-only in Qemu. Hence everything seems good. I'd appreciate if you could give s390x a test.. I never touched s390x and it will probably take some extra effort to get into it. -- Best regards, Dmitry
