From mboxrd@z Thu Jan  1 00:00:00 1970
From: Jeremy Fitzhardinge <jeremy@goop.org>
Subject: Re: arch_set_info_guest() and cr1
Date: Fri, 12 Aug 2011 19:17:57 -0700
Message-ID: <4E45DED5.40602@goop.org>
References: <20110811190315.1cc6afab@mantra.us.oracle.com>
	<CA6A83D7.1F1E6%keir.xen@gmail.com>
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To: Mukesh Rathor <mukesh.rathor@oracle.com>
Cc: "Xen-devel@lists.xensource.com" <Xen-devel@lists.xensource.com>, Keir Fraser <keir.xen@gmail.com>
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On 08/12/2011 03:01 PM, Mukesh Rathor wrote:
> Ah I see it, during save/restore, it is used. 
> Well, I'm trying to keep the option of using PV paging with hybrid, so 
> I may need to honor that. But that's phase 2.

Though it would be nice to re-enable the use of PV writable pagetables
to get access to HAP, and we could do without that.

Does Xen require that the user pagetable be a proper subset of the
kernel pagetable?  If we can assume that and get proper ring protections
in the HVM container, then we can simply ignore the user pagetable (and
would have to if we want to get good syscall performance).

    J