On Tue, Feb 28, 2023 at 01:22:50PM +0000, Liu, Yi L wrote: > > A null iommufd pointer and a bound df flag is sufficient to see that > > it is compat mode. > > Hope df->is_cdev_device suits your expectation.:-) The code will look > like below: Yes, this is better.. However I'd suggest 'uses_container' as it is clearer what the special case is Jason