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Not using it yet, that will be done in the next patch. Xe only supports submission using VM. For i915 the backend functions are just a noop. Signed-off-by: José Roberto de Souza <jose.souza@intel.com> Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/21698>