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From: af@cs.cmu.edu (Alessandro Forin)
Newsgroups: comp.os.mach
Subject: Re: Mach as a Virtual Machine
Message-ID: <1991May3.060541.2846@cs.cmu.edu>
Date: 3 May 91 06:05:41 GMT
References: <1991Apr19.180259.18834@cs.cmu.edu> <21336@paperboy.OSF.ORG>
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Organization: School of Computer Science, Carnegie Mellon
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> It also allows you to run VM on VM,  which Mach does not offer.

Mach traps can be redirected to user space just like any other trap.
There is one trap (htg_mach_syscall) that allows you to invoke the
others even if they are redirected  ==> Mach on Mach is trivial :-))

Much more interesting is the work that is being done for Norma-Mach,
which also involves "emulating" various Mach kernel services in user space.

sandro-