[RFC] XI Shadow Page Table Mechanism

[Ben Thomas <bthomas@virtualiron.com>]

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This post contains the design document for what is currently known
as the "XI Shadow Mechanism".  This is a design for shadow
page table code for fully virtualized HVM domains running on a 64-bit
Xen hypervisor.

This work was undertaken to address a number of goals.  These are
enumerated in the document and include:

- ability to run fully virtualized 32, 32PAE and 64 bit guest
   domains concurrently on a 64-bit hypervisor

- support live migration of fully virtualized domains

- provide good performance and robustness

This design has been implemented and is currently being tested.
It has been supporting the variety of memory models as noted above,
and using widely used Windows and Linux distributions (SuSe,
RedHat and others). At a point in the near future, a patch
will be available.

This design center is the x86-64 architecture. It is not our
intent to completely replace all shadow page management, and
we've attempted to limit the scope of change.

A preliminary version of this design concept has undergone
brief review with some members of the Xen community. We hope
that this is of value to the Xen community and welcome your
feedback and comments.

Thanks,
-b

-- 
------------------------------------------------------------------------
Ben Thomas                                         Virtual Iron Software
bthomas@virtualiron.com                            Tower 1, Floor 2
978-849-1214                                       900 Chelmsford Street
                                                    Lowell, MA 01851

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