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

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

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.

Ian.


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