From mboxrd@z Thu Jan  1 00:00:00 1970
From: Ian Campbell <ian.campbell@citrix.com>
Subject: Re: [PATCH Remus v2 04/10] tools/libxc: introduce
 DECLARE_HYPERCALL_BUFFER_USER_POINTER
Date: Mon, 11 May 2015 12:53:02 +0100
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To: Yang Hongyang <yanghy@cn.fujitsu.com>
Cc: wei.liu2@citrix.com, wency@cn.fujitsu.com, andrew.cooper3@citrix.com, yunhong.jiang@intel.com, eddie.dong@intel.com, xen-devel@lists.xen.org, rshriram@cs.ubc.ca, ian.jackson@eu.citrix.com
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On Fri, 2015-05-08 at 17:33 +0800, Yang Hongyang wrote:
> Define a user pointer that can access the hypercall buffer data
> Useful when you only need to access the hypercall buffer data

Can you expand on this please, I think the context is a hypercall buffer
passed as an argument or as a member of a struct. Please describe why
DECLARE_HYPERCALL_BUFFER_ARGUMENT and/or DECLARE_HYPERCALL_BUFFER_SHADOW
are not usable here.

Ian.