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Re: [Xen-devel] [PATCH v3 5/6] ioreq-server: add support for multiple servers

On Mon, 2014-03-17 at 14:52 +0000, Paul Durrant wrote:
> > -----Original Message-----
> > From: Ian Campbell

> > It's always struck me as odd to have a Xen<->DM communication channel
> > sitting there in guest pfn space (regardless of who the nominal owner
> > is).
> > 
> > I don't suppose there is any way to pull these pages out of the guest
> > pfn space while still accounting them to the guest. Or if there is it
> > would probably be a whole other kettle of fish than this series.
> > 
> The closest analogy I can think of accounting-wise would be shadow
> pages. I'll have a look at how they are handled.

I think the big difference is that noone outside Xen needs to be able to
refer to a shadow page, whereas the device models need some sort of
handle onto the ring to be able to map them etc. Not insurmountable I


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