From mboxrd@z Thu Jan  1 00:00:00 1970
From: Keir Fraser <keir.fraser@eu.citrix.com>
Subject: Re: Re: [PATCH] Support swap a page from user spacetools
	-- Was RE: [RFC][PATCH] Basic support for page  offline
Date: Fri, 20 Mar 2009 10:40:26 +0000
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To: "Jiang, Yunhong" <yunhong.jiang@intel.com>, Jan Beulich <jbeulich@novell.com>
Cc: Tim Deegan <Tim.Deegan@eu.citrix.com>, "xen-devel@lists.xensource.com" <xen-devel@lists.xensource.com>
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On 20/03/2009 10:36, "Jiang, Yunhong" <yunhong.jiang@intel.com> wrote:

>> Anyway, see my email just now, which suggests you map the guest's grant
>> table into your toolstack code, and you can go check for
>> existing grants
>> yourself. As I say there -- if you do that I don't think you need worry
>> about atomicity of the copy.
> 
> Are there any method for user space to get the grant table information?

GNTTABOP_query_size to discover size of the grant table.

GNTTABOP_setup_table to get the frame list (pass in nr_frames from the
query_size operation).

Map the frames and away you go.

 -- Keir