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iommufd/selftests: Preserve all the FDs in a batch
Use the luo_session_preserve_fds() to preserve vfio cdev, iommufd and memfd together in a batch. Signed-off-by: Samiullah Khawaja skhawaja@google.com — …/iommu/iommufd_liveupdate_kexec_test.c