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xen-devel
Re: [Xen-devel] [PATCH] Add new location of Linux direct-map to theplace
At 20:19 +0100 on 12 Sep (1221250763), Ian Pratt wrote:
> What would also be interesting would be a shadow pagetable mode that
> stored 'back pointers' to enable one to easily find all the shadow PTEs
> that point to a page. This would be useful for some of the more fancy
> shadow pagetable modes that are interesting from a research POV, as well
> as coping with guests that use some other mechanism for updating PTEs
> (if such guests exist).
ISTR we decided not to do this when we were planning shadow2, because it
doubles the memory overhead and adds extra bookkeeping to the fast
paths. Not to say it wouldn't be interesting, though. :)
Tim.
--
Tim Deegan <Tim.Deegan@xxxxxxxxxx>
Principal Software Engineer, Citrix Systems (R&D) Ltd.
[Company #02300071, SL9 0DZ, UK.]
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