<snip> When a z/VM guest issues the STFLE command, z/VM intercepts it and returns the lowest-common-denominator value for all processors available for LGR. </snip>
I think this implies that any user of LGR must have "pre-set" the definition of "processors available for LGR" before IPLing an image (such as z/OS). If that's the expectation and the reality, then I agree. I was thinking of some change "after IPL", but perhaps that is what cannot happen. For example, if you have a z14 but have defined a rule such as "I might want to use LGR down to a z13" and that rule gets applied to an IPLing z/OS, then only the z13 facilities would show up. Can there be such a (hypothetical) definition set up for each individual guest, as opposed to there being one definition for all guests (the latter seeming far too restrictive)? Peter Relson z/OS Core Technology Design
