http://www.kerneltraffic.org/kernel-traffic/kt20031201_243.html
--- Relevant section ---
Nuno Silva mentioned:
 The good people at Cambridge made a (very nice) VMM that exploits
ring0/1/3 to let one machine run various kernels independently (the
kernels need to be ported to the xen arch).
 Xen itself executes in ring0 and the "guest" operating systems
execute in ring1. User code runs in ring3, as usual. They have linux
running under xen ;)
 The project's home page is at
http://www.cl.cam.ac.uk/Research/SRG/netos/xen/ and one paper describing
the whole thing is here:
http://www.cl.cam.ac.uk/netos/papers/2003-xensosp.pdf
And Linus replied:
 This is what I alluded to [in a previous comment] - saying that if
you move the driver down to ring1, then you should move _everything_
down to ring1 and just leave a microkernel at ring0.
 Now, I'm not big on microkernels, but a pure virtual machine
abstraction is at least not the distateful academic mental masturbation
that we saw in the 80's.
--- end ---
Cheers,
James Scott
Purveyor of Non-distasteful Academic Mental Masturbation
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