GEM allocation for para-virtualized DRM driver

Hello, I am writing a para-virtualized DRM driver for Xen hypervisor and it now works with DRM CMA helpers, but I would also like to make it work with non-contigous memory: virtual machine that the driver runs in can't guarantee that CMA is actually physically contigous (that is not a problem because of IPMMU and other means, the only constraint I have is that I cannot mmap with pgprot == noncached). So, I am planning to use *drm_gem_get_pages* + *shmem_read_mapping_page_gfp* to allocate memory for GEM objects (scanout buffers + dma-bufs shared with virtual GPU)

Do you think this is the right approach to take?

Thank you,

Oleksandr