Re: [Xen-devel] pagetable pinning question

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

> > I can't comment on the 1.3 problem but for 1.2 it would seem to me that
> > simply increasing the L2's reference count when we map a different L2 table
> > as a twisted L2 table would keep things sane even in the circular case, as
> > long as we unmap in the opposite order.  Or am I missing something?
> > 
> > I think I can guarantee that the unmap order is correct if I clear the
> > alternate mapping whenever I switch pagetables (and there's no switches
> > between a requested mapping and the corresponding unmap).  The pool cache
> > destructor would then also only need to check the current pagetable's
> > alternate mapping.
> 
> Okay, I've checked in a fix for 1.2 that bumps the reference ocutn
> when mapping other PDs, and has an appropriate destructor/cleanup
> function. 
> 
> I'm still thinking about the tidiest way to change 1.3 to get the same
> behaviour. 

I think I have the right solution now. I've checked it into the
unstable tree.

 -- Keir


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