From mboxrd@z Thu Jan  1 00:00:00 1970
From: Ian Campbell <ian.campbell@citrix.com>
Subject: Re: [PATCH V13 3/7] xen/arm: Allow hypervisor access to
 mem_access protected pages
Date: Thu, 12 Mar 2015 15:55:59 +0000
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On Thu, 2015-03-12 at 16:41 +0100, Tamas K Lengyel wrote:

> We could check stage-1 permissions by walking the guest page tables
> and looking at the pte permissions, however I'm not aware of having
> this function implemented within Xen.

The h/w can do this for you, you just need to arrange for gva_to_ipa_par
to select between ATS1CPR and ATS1CPW like gva_to_ma_par does.

Ian.