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Re: [Xen-devel] [PATCH] x86: expose XENMEM_get_pod_target to subject domain

On Wed, 2014-02-26 at 09:46 +0000, Jan Beulich wrote:
> >>> On 26.02.14 at 10:25, Ian Campbell <Ian.Campbell@xxxxxxxxxx> wrote:
> > On Tue, 2014-02-25 at 08:03 +0000, Jan Beulich wrote:
> >> Anyway, I also consider it odd to complain about this now when
> >> the referenced discussion has happened weeks ago, with no
> >> useful result.
> > 
> > IIRC George was on vacation and/or travelling for a conference back then
> > (or maybe he was just back in town and buried in email, with the same
> > affect)
> > 
> > Anyway, since George knows PoD better than any of us I think it is worth
> > revisiting things with his input.
> > 
> > I would certainly prefer a solution which exposed some more semantically
> > meaningful information (from the guest's PoV) which lets it do the right
> > thing rather than just exposing the PoD internal accounting directly,
> > since that seems like rather an implementation detail to me. e.g. what
> > if we decide to make the PoD cache shared between a bunch of related
> > guests (totally hypothetical) or back it with the normal page sharing or
> > paging mechanisms? We don't want those sorts of changes to create a
> > visible guest ABI difference.
> So what's the counter proposal then?

My expectation was that was why George is asking questions... Since he
knows PoD I'm hoping he will have some ideas.


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