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Basic tests of establishing a dmabuf and revoking it. The selftest kernel side provides a basic small dmabuf for this testing. Link: https://patch.msgid.link/r/9-v2-b2c110338e3f+5c2-iommufd_dmabuf_jgg@nvidia.com Reviewed-by: Nicolin Chen <nicolinc@nvidia.com> Reviewed-by: Kevin Tian <kevin.tian@intel.com> Tested-by: Nicolin Chen <nicolinc@nvidia.com> Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>