[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

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

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

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


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
PGP Fingerprint: F5A4 1575 4C56 E26A 0B33  3D80 457E 82AE B0D8 735B

Xen-devel mailing list



Lists.xenproject.org is hosted with RackSpace, monitoring our
servers 24x7x365 and backed by RackSpace's Fanatical Support®.