From mboxrd@z Thu Jan  1 00:00:00 1970
From: Ian Campbell <Ian.Campbell@citrix.com>
Subject: Re: [PATCH v2 for 4.5] xen/arm: Add support for GICv3
 for domU
Date: Mon, 10 Nov 2014 10:03:03 +0000
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To: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: wei.liu2@citrix.com, vijay.kilari@gmail.com, stefano.stabellini@eu.citrix.com, tim@xen.org, Vijaya.Kumar@caviumnetworks.com, Julien Grall <julien.grall@linaro.org>, ian.jackson@eu.citrix.com, stefano.stabellini@citrix.com, Jan Beulich <JBeulich@suse.com>, xen-devel@lists.xenproject.org, dgdegra@tycho.nsa.gov
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On Sat, 2014-11-08 at 15:26 -0500, Konrad Rzeszutek Wilk wrote:
> That is to guard against somebody building against libxc or libxl and
> then becoming dependent on this and then complaining that it is not in
> Xen 4.6. 

libxc does not have a stable API and libxl doesn't expose this interface
at all. At the hypercall level this is a domctl which simliarly has no
stable interface.

So I don't think there is any need to wrap anything or guard against
anything.