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Those are useful to implement coherent cross-vm mmap. Signed-off-by: Sasha Finkelstein <fnkl.kernel@gmail.com> Reviewed-by: Dmitry Osipenko <dmitry.osipenko@collabora.com> Tested-by: Dmitry Osipenko <dmitry.osipenko@collabora.com> Link: https://patchwork.freedesktop.org/patch/msgid/20250109-virtgpu-gem-partial-map-v1-1-a914b48776bd@gmail.com Signed-off-by: Dmitry Osipenko <dmitry.osipenko@collabora.com> [dmitry.osipenko@collabora.com: Corrected vm_size check to account vm_pgoff]