From mboxrd@z Thu Jan  1 00:00:00 1970
From: Jeremy Fitzhardinge <jeremy@goop.org>
Subject: Re: how to enable shadow page table? Do I have to run
 HVM guest systems for shadow paging mode?
Date: Mon, 16 Mar 2009 09:30:12 -0700
Message-ID: <49BE7E94.3020401@goop.org>
References: <20090316161757.EF9173400090@usps.crhc.uiuc.edu>
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To: Long Wang <longwang@crhc.illinois.edu>
Cc: Xen-devel <xen-devel@lists.xensource.com>, Tim Deegan <Tim.Deegan@citrix.com>
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Long Wang wrote:
> I am working on a research project based on Xen 3.3.1. I want to use the
> shadow page table for setting guest system memory pages as read-only and/or
> dirty, and perform a copy-on-write mechanism when these memory pages are
> updated. I heard that auto_translated_physmap is not supported any more. 
>   

Yes, auto_translated_physmap is not supported by Xen or by the pvops 
guest kernels.

> Then how can I enable shadow page table? Do I have to run HVM guest systems
> to have shadow paging mode? Can I enable shadow paging mode in PV?
>   

Well, Xen supports log-dirty mode for doing live migration of PV guests, 
which looks to be what you're describing above.  You might want to look 
into the existing live migration machinery to see if it meets your needs.

    J