When the system supplies an SDWA, the system provides it in storage that can be referenced by all subspaces. A recovery routine running in a subspace does not have to do anything extra to reference the SDWA.

If the mainline program passes a user parameter area to the recovery routine, the mainline routine should create the user parameter area in storage that can be referenced by all subspaces. This ensures that, if the recovery routine changes the environment in which it is running, it will still be able to reference the user parameter area.