Martin, (no, I am not talking to myself)

Live Guest Relocation is not supported for z/OS as well as for z/VSE
(don't know about ACP or z/VM) for things these operating systems do. If
they would adhere to certain restrictions it would be possible to
do it for them as well. I have no information about anything in CP
that does stop VM from doing it (but it does certainly not yield
meaningfull results).

>> ... is the mechanism for hiding new instructions available for a z/OS
>> guest?

It is implemented (and explored) in CP - so why should a guest not be
able to explore its advantages (i.e. restrict to a older level, get a
0C1 for unsupported instructions)- I have never participated in a
technical disclosure meeting in Poughkeepsie, but I do believe there
are people clever enough asking for such things.

-- 
Martin Trübner; everything around "PoOps of z/arch"

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