mlx5dv_devx_umem_reg(3) on Linux
The text 2f97319c254d, as Debian 12 (Bookworm) shipped it.
Register a user memory to be used by the devx interface mlx5dv_devx_umem_reg_ex - Register a user memory to be used by the devx interface mlx5dv_devx_umem_dereg - Deregister a devx umem object