linux-kernel - Re: [Xen-devel] [PATCH v2] Persistent grant maps for xen blk drivers

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Date:	Mon, 24 Sep 2012 12:44:53 +0100
From:	Ian Campbell <Ian.Campbell@...rix.com>
To:	Jan Beulich <JBeulich@...e.com>
CC:	"Oliver Chick (Intern)" <oliver.chick@...rix.com>,
	"konrad.wilk@...cle.com" <konrad.wilk@...cle.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"xen-devel@...ts.xen.org" <xen-devel@...ts.xen.org>
Subject: Re: [Xen-devel] [PATCH v2] Persistent grant maps for xen blk drivers

On Mon, 2012-09-24 at 12:36 +0100, Jan Beulich wrote:
> >>> On 21.09.12 at 17:52, Oliver Chick <oliver.chick@...rix.com> wrote:
> > Changes since v1:
> > 
> >  * Maximum number of persistent grants per device now 64, rather than
> >    256, as this is the actual maxmimum request in a (1 page) ring.
> 
> As said previously, I don't see why this needs to have a separate
> #define at all - it's simply __RING_SIZE(). No adding this would
> also imply that - apart from perhaps documenting the new xenstore
> nodes - io/blkif.h would need changing at all (which otherwise would
> require a hypervisor side patch to be submitted too).

Whether or not this definition is required in blkif.h we certainly want
a patch to the hypervisor tree to document this new protocol extension.

Ian.

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