iommufd/selftest: Add coverage for viommu data
Extend the existing test_cmd/err_viommu_alloc helpers to accept optional user data. And add a TEST_F for a loopback test. Link: https://patch.msgid.link/r/8ceb64d30e9953f29270a7d341032ca439317271.1752126748.git.nicolinc@nvidia.com Reviewed-by:Pranjal Shrivastava <praan@google.com> Reviewed-by:
Kevin Tian <kevin.tian@intel.com> Signed-off-by:
Nicolin Chen <nicolinc@nvidia.com> Signed-off-by:
Jason Gunthorpe <jgg@nvidia.com>
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