Papers on Layered UNIX systems like Apollo VRM, Apollo SR10, etc.

[Tom Chmara]

Does anyone know where in the literature (USENIX proceedings, etc) I could
find information on the pitfalls and difficulties in layering UNIX on a
"Virtual machine"?  This VM would handle the native hardware, giving UNIX
a sanitized version of reality.  No, it's not my idea of a performance-
oriented machine, but there is interest in building something like that
here (small, fast nucleus offering services to UNIX and other OSes)
	Thanks for your time...
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