Re: [Xen-devel] [PATCH XEN v5 07/23] tools: Refactor /dev/xen/gnt{dev, shr} wrappers into libxengnttab.

[Ian Campbell <ian.campbell@xxxxxxxxxx>]

On Tue, 2015-11-24 at 09:34 +0000, Ian Campbell wrote:
> Thinking about this some more overnight, it occurred to me that the
> real issue is that gnttab and gntshr are actually two quite difference
> APIs. gnttab is all about consuming grant references which are given to
> you from elsewhere while gntshr is all about creating grant references
> to give to others. They have relatively little in common wrt the
> underlying infrastructure, e.g. gnttab is mostly about making GNTTABOP
> hypercalls while gntshr mostly interacts with the kernel's grant ref
> allocator with no interaction with the hypervisor.
> 
> Maybe that and the API issues above constitute an argument for not
> combining, I'm really not sure.

Ian and I discussed this (briefly) in real life and based on the above
argumentation we decided that keeping the two APIs separate (but in the
same library) was justified, since there is a reasonable enough air gap
between their functionality (i.e. consuming vs producing grants).

We did wonder a bit about changing the names to make that divide clearer,
but couldn't think of anything especially compelling and decided to stick
with the current shade of yellow.

Ian.


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