Re: [Xen-devel] [PATCH v4 5/8] ioreq-server: add support for multiple servers

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Wed, 2014-04-09 at 13:43 +0100, Jan Beulich wrote:
> >>> On 02.04.14 at 17:11, <paul.durrant@xxxxxxxxxx> wrote:
> > Secondary servers use guest pages to communicate with emulators, in
> > the same way as the default server. These pages need to be in the
> > guest physmap otherwise there is no suitable reference that can be
> > queried by an emulator in order to map them. Therefore a pool of
> > pages in the current E820 reserved region, just below the special
> > pages is used. Secondary servers allocate from and free to this pool
> > as they are created and destroyed.
> 
> Ah, here is the answer to the question I raised on patch 6 - somehow
> I managed to look at them in wrong order. Nevertheless, and also in
> the context of the discussion we had with Stefano yesterday, we may
> want/need to think of a way to allow pages to be trackable without
> being mapped in the physmap.

Is what is wanted a new XENMAPSPACE which could be used via
xen_add_to_physmap_batch to map foreign_dom.idx where idx for that
mapspace is the ioreq page index rather than a gfn?

Ian.


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