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You can test > > that it returns an error when it's supposed to, and a valid fd when > > it's supposed to. And once the iommufd importer side is ready, we can > > extend the test and verify that the fd can be mapped into iommufd. > > No problem, I'll add such test, but let's focus on making sure that this > series is accepted first. Along similar lines, perhaps adding vfio as src/vfio_memory.c dmabuf provider to perftest [1] could be useful for low-level end-to-end validation. https://github.com/linux-rdma/perftest