On Mon, Mar 10, 2008 at 11:35:50AM -0700, Jeremy Fitzhardinge wrote:
quoted text
> Hm, given that Xen doesn't make any topology guarantees about vcpus, I 
> don't think it would make much difference.  I think it would only be 
> observable if you actually pinned the vcpus to physical siblings.  
> Besides we could easily maintain sibling info and look to see if we're 
> about to reload cr3 to match the other thread(s), then just use the same 
> pgd copy.

The optimization doesn't really require any topology information; 
you just should make sure that if you have a VM shared between
different CPUs that it has the same CR3. The easiest way to enforce
that is to always only use a single CR3 for a VM.

-Andi
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