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Add tests which validate dma map/unmap at the end of address space. Add negative test cases for checking that overflowing ioctl args fail with the expected errno. Reviewed-by: David Matlack <dmatlack@google.com> Signed-off-by: Alex Mastro <amastro@fb.com> Link: https://lore.kernel.org/r/20251028-fix-unmap-v6-5-2542b96bcc8e@fb.com Signed-off-by: Alex Williamson <alex@shazbot.org>