Re: [Xen-devel] Xen inside Xen with VMX?

[Daniel Stodden <stodden@xxxxxxxxxx>]

On Thu, 2008-01-31 at 07:07 -0500, Ben Guthro wrote:
> Current VT implementations do not have this ability, AFAIK.

Indeed. There's only one root mode, and the processor has no concept of
recursively stacking roots and accompanying protection levels on top of
each other.

Nonetheless, root mode could be emulated, i.e. via shadow VMCBs,
optional shadow NPTs and emulation of the respective instruction subset.

Would suffer from the same (most probably solvable) problems regarding
privilege compression and the like, but probably an interesting
excercise.

Maybe one should put it on some (nonexisting) list for interesting
[academic] projects.

regards,
daniel

-- 
Daniel Stodden
LRR     -      Lehrstuhl fÃr Rechnertechnik und Rechnerorganisation
Institut fÃr Informatik der TU MÃnchen             D-85748 Garching
http://www.lrr.in.tum.de/~stodden         mailto:stodden@xxxxxxxxxx
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