linux-kernel - Re: [PATCH 1/2] xen/granttable: Support sub-page grants

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Message-ID: <1323254036.23681.142.camel@zakaz.uk.xensource.com>
Date:	Wed, 7 Dec 2011 10:33:56 +0000
From:	Ian Campbell <Ian.Campbell@...rix.com>
To:	ANNIE LI <annie.li@...cle.com>
CC:	Paul Durrant <Paul.Durrant@...rix.com>,
	"xen-devel@...ts.xensource.com" <xen-devel@...ts.xensource.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"konrad.wilk@...cle.com" <konrad.wilk@...cle.com>,
	"jeremy@...p.org" <jeremy@...p.org>,
	"kurt.hackel@...cle.com" <kurt.hackel@...cle.com>
Subject: Re: [PATCH 1/2] xen/granttable: Support sub-page grants

On Wed, 2011-12-07 at 10:27 +0000, ANNIE LI wrote:
> 
> On 2011-12-7 17:57, Ian Campbell wrote:
> > On Wed, 2011-12-07 at 08:59 +0000, Paul Durrant wrote:
> >>> gnttab_v2_ops = {
> >>>    ...
> >>> .access_subpage = access_subpage_v2;
> >>> .access_ref_subpage = access_ref_subpage_v2; .access_trans =
> >>> access_trans_v2; .access_ref_trans = access_ref_trans_v2; }
> >>>
> >>
> >> Do you need ops for the ref and non-ref functions? I would have
> >> thought you could just have the ref ones since the all the non-ref
> >> variants do is allocate and then call the ref variant.
> > Good point. It appears that all the existing ops are only present in the
> > ref form.
> So I will add two elements: access_ref_subpage and access_ref_trans into 
> gnttab_v2_ops.

The existing convention seems to be for _ref to be a suffix, although
it's only actually used on the end_*_ref ones.
+       int (*end_foreign_access_ref)(grant_ref_t, int);
+       unsigned long (*end_foreign_transfer_ref)(grant_ref_t);

Also it occurs to me that access_* sounds like something which uses a
ref rather than something which sets one up. The existing hook to setup
a normal grant is called "update_entry". Perhaps
update_{subpage,transitive}_entry?

Ian.

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