Hi Gerd, We found a bug in 5.4 kernel and virtgpu_gem_prime_mmap doesn't work because it references vma_node in gem_base object while ttm code initialized vma_node in tbo.base object. I am wondering, in your original serial: https://patchwork.kernel.org/project/dri-devel/cover/20190805124310.3275-1-kraxel@xxxxxxxxxx/ (drm/ttm: make ttm bo a gem bo subclass), why you changed to use embedded gem object for most gpu drivers but skipping virtio gpu? Is there some specific reason? I am thinking about CL like this (http://crrev.com/c/3092457) to fix it and not sure if I missed something. Thanks for your help!
