RE: [Xen-devel] PAE support revisited

["Ian Pratt" <m+Ian.Pratt@xxxxxxxxxxxx>]

> So if xen is using PAE, all domains must also use PAE - it's a machine
> wide thing and not something that could be jumped between on 
> the fly. Is
> that right? What I was hoping for was a mode where Xen might run using
> PAE but could set up memory access for the domains so that 
> they wouldn't
> need to use PAE, provided their memory requirements didn't exceed 4G.
> But from what you are saying this just cannot be. Oh well.

Not without using shadow page tables. It would be great if Linux had a
mode where it boot-time switched between 2 and 3 level (see my other
post on this topic).

Xen's shadow page table algorithm is *very* good, but there are
inevitable performance and memory usage costs.

Ian
 



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