linux-kernel - Re: [Xen-devel] [RFC 12/23] xen: Extend page_to

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Message-ID: <555B4167.7050506@citrix.com>
Date:	Tue, 19 May 2015 14:57:59 +0100
From:	David Vrabel <david.vrabel@...rix.com>
To:	Julien Grall <julien.grall@...rix.com>,
	<xen-devel@...ts.xenproject.org>
CC:	<ian.campbell@...rix.com>, <stefano.stabellini@...citrix.com>,
	<netdev@...r.kernel.org>, <tim@....org>,
	<linux-kernel@...r.kernel.org>,
	David Vrabel <david.vrabel@...rix.com>,
	Boris Ostrovsky <boris.ostrovsky@...cle.com>,
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [Xen-devel] [RFC 12/23] xen: Extend page_to_mfn to take an offset
 in the page

On 14/05/15 18:00, Julien Grall wrote:
> With 64KB page granularity support in Linux, a page will be split accross
> multiple MFN (Xen is using 4KB page granularity). Thoses MFNs may not be
> contiguous.
> 
> With the offset in the page, the helper will be able to know which MFN
> the driver needs to retrieve.

I think a gnttab_grant_foreign_access_ref()-like helper that takes a
page would be better.

You will probably want this helper able to return/fill a set of refs for
64 KiB pages.

David
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