From mboxrd@z Thu Jan  1 00:00:00 1970
From: Keir Fraser <keir@xen.org>
Subject: Re: [PATCH] x86/mm: remove the linear mapping of the
 p2m tables
Date: Fri, 14 Sep 2012 21:55:40 +0100
Message-ID: <CC79585C.4BD12%keir@xen.org>
References: <CACJDEmpMXLEvtv-Y8X6StBOd0B7jLZfvFG1B_Ru1_uUimU2kiA@mail.gmail.com>
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To: Konrad Rzeszutek Wilk <konrad@kernel.org>
Cc: Tim Deegan <tim@xen.org>, Jan Beulich <JBeulich@suse.com>, xen-devel@lists.xen.org
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On 14/09/2012 21:31, "Konrad Rzeszutek Wilk" <konrad@kernel.org> wrote:

>> Don't think so, since we'll continue to run old guests as pure PV.
>> 
>> There was a backup for running on older CPUs, and that was to allow PVH
>> guests to run on shadow page tables. That's a totally separate compatibility
>> concern however.
> 
> I am talking about the inverse. Running the "new" PV guests which do
> not have PV MMU
> enabled in them (since the PV MMU calls would not be necessary
> anymore) and running
> on non-NPT hardware.
> 
> For that PV auto-xlat would be necessary.

These 'new' PV guests are PVH guests. We're talking about removing PV
auto-xlat, not disallowing PVH auto-xlat. Subtle difference, but PVH will
always run in an HVM container.

 -- Keir