Re: [Xen-devel] Re: [ANNOUNCE] Xen high-performance x86 virtualization

[Keir Fraser]

> And the amount of work to port the architecture-specific porions of
> Xen to x86-xeno would be.....?   :-)

To allow efficient switching in and out of Xen we take a small amount
of every virtual address space, and also grab ring 0. Since we don't
hide that from overlying OSes, we couldn't do a full recursive
implementation of Xen -- we'd run out of rings (quickly) and address
space (eventually) :-) 

Full recursion needs full virtualization. Our approach offers much
better performance in the situations where full virtualization isn't
required -- i.e., where it's feasible to distribute a ported OS.

 -- Keir
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