From mboxrd@z Thu Jan  1 00:00:00 1970
From: Mukesh Rathor <mukesh.rathor@oracle.com>
Subject: HYBRID: memory mapped IO
Date: Tue, 14 Feb 2012 18:53:14 -0800
Message-ID: <20120214185314.5546a24e@mantra.us.oracle.com>
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To: "Xen-devel@lists.xensource.com" <Xen-devel@lists.xensource.com>, Keir Fraser <keir.xen@gmail.com>, "stefano.stabellini@eu.citrix.com" <stefano.stabellini@eu.citrix.com>, Ian Campbell <Ian.Campbell@citrix.com>
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Hi Guys,

ich_force_enable_hpet() in linux wants to do mmio. It calls ioremap_pte_range
to map phys addr to a VA. Xen then updates the PV dom0's L1 with
requested io attributes. I'm trying to figure how to do this for PV in
HVM container. I was hoping to update the EPT directly.

I was thinking of just doing guest_physmap_add_entry() but the mfn is not
going to be valid. Is there any other code path that will let me do this?

Another possiblity would be handle_mmio(). 

thanks,
Mukesh