Re: [Xen-devel] Essay on an important Xen decision (long)

[Anthony Liguori <aliguori@xxxxxxxxxx>]

Hi Keir,

Keir Fraser wrote:

> On an architecture where VP is cheaper to implement than on x86, it 
> may well make sense to do that in preference to P2M. As you say, it 
> makes certain future extensions less of a pain to implement.
Is VP on x86 expensive in terms of performance or complexity?

I imagine that you would have to always have shadow paging enable but 
you could still do bulk updates ala writable page tables so the 
performance cost should be minimal I would think.
Trying to understand the memory system in more details so any additional 
info is much appreciate :-)
Thanks,

Anthony Liguori

> If ia64 does decide to back off from the P==M route then I suspect VP 
> is the way to go (which is I think how ia64 domU's currently work 
> anyway).
>  -- Keir

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