Re: [Xen-devel] [PATCH 2/4] xen: introduce grant_map_exists

["Jan Beulich" <jbeulich@xxxxxxxx>]

>>> Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx> 10/03/14 3:50 PM >>>
>On Thu, 2 Oct 2014, Jan Beulich wrote:
>> Then at the very least let's allow for either a dev_bus_addr or
>> a grant-ref (even if for the moment the latter may yield
>> -EOPNOTSUPP in order to not spend more time on this than
>> immediately necessary). That way guests remembering what
>> they did a few microseconds back can do this in a more well
>> behaved fashion.
>
>I can add the gref as a possible parameter in a union, but I would like
>to keep the interface multi-page capable. So the gref case is going to
>work implicitly only on a single page.

Imo that's not a reasonable design choice when this is to become a gnttab
op - this should instead use the usual built-in batching most gnttab ops
have to deal with multi-page extents.

Jan


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