This is an archived copy of the Xen.org mailing list, which we have preserved to ensure that existing links to archives are not broken. The live archive, which contains the latest emails, can be found at http://lists.xen.org/
Home Products Support Community News


Re: [Xen-devel] Question on save/restore mfn canonicalization

To: Andres Lagar-Cavilla <andreslc@xxxxxxxxxxxxxx>
Subject: Re: [Xen-devel] Question on save/restore mfn canonicalization
From: John Levon <levon@xxxxxxxxxxxxxxxxx>
Date: Fri, 28 Sep 2007 18:54:29 +0100
Cc: xen-devel@xxxxxxxxxxxxxxxxxxx
Delivery-date: Fri, 28 Sep 2007 10:55:19 -0700
Envelope-to: www-data@xxxxxxxxxxxxxxxxxx
In-reply-to: <46FD2AF8.30107@xxxxxxxxxxxxxx>
List-help: <mailto:xen-devel-request@lists.xensource.com?subject=help>
List-id: Xen developer discussion <xen-devel.lists.xensource.com>
List-post: <mailto:xen-devel@lists.xensource.com>
List-subscribe: <http://lists.xensource.com/cgi-bin/mailman/listinfo/xen-devel>, <mailto:xen-devel-request@lists.xensource.com?subject=subscribe>
List-unsubscribe: <http://lists.xensource.com/cgi-bin/mailman/listinfo/xen-devel>, <mailto:xen-devel-request@lists.xensource.com?subject=unsubscribe>
References: <46FD2AF8.30107@xxxxxxxxxxxxxx>
Sender: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx
User-agent: Mutt/1.5.9i
On Fri, Sep 28, 2007 at 12:25:28PM -0400, Andres Lagar-Cavilla wrote:

> While exploring the paravirt save/restore code path, I noted a 
> (seemingly) lack of consistency between where/who canonicalizes 
> something and who un-canonicalizes. For example, the guest kernel 
> canonicalizes the store and console mfn's in pre_suspend, but 
> xc_domain_restore uncanonicalizes them before scheduling back the 
> restored guest.
> The question is if there is a mandatory reason for this, or is just the 
> way the code was written. Can I, e.g, fill the 
> pfn_to_mfn_frame_list(_list) entries from "outside" and remove that code 
> from post_suspend, or will something break?

You'll break the ABI. I don't know of a reason why it's so inconsistent.


Xen-devel mailing list

<Prev in Thread] Current Thread [Next in Thread>