<snip>
I am trying to avoid running key 0 or supervisor state to the extent 
possible
</snip>

Avoiding key 0 is nice. Avoiding supervisor state is less important. 

Unintended bad consequences of running with more privilege than absolutely 
needed are quite uncommon when the privilege is "supervisor state" 
(because usually the bad consequences are due to executing the 
instructions that you wanted but referencing data that you did not intend)

Peter Relson
z/OS Core Technology Design


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