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Message-Id: <4E201743020000780004D8B8@nat28.tlf.novell.com>
Date:	Fri, 15 Jul 2011 09:32:35 +0100
From:	"Jan Beulich" <JBeulich@...ell.com>
To:	"Olaf Hering" <olaf@...fle.de>
Cc:	<Ian.Campbell@...rix.com>, <xen-devel@...ts.xensource.com>,
	<konrad.wilk@...cle.com>, <linux-kernel@...r.kernel.org>,
	<keir@....org>
Subject: Re: [Xen-devel] [PATCH] xen: update machine_to_phys_order on
	 resume

>>> On 14.07.11 at 12:26, Olaf Hering <olaf@...fle.de> wrote:
> On Wed, Jul 13, Jan Beulich wrote:
> 
>> >>> Ian Campbell <Ian.Campbell@...rix.com> 07/13/11 11:12 AM >>>
>> >It's not so much an objection to this patch but this issue seems to have
>> >been caused by Xen cset 20892:d311d1efc25e which looks to me like a
>> >subtle ABI breakage for guests. Perhaps we should introduce a feature
>> >flag to indicate that a guest can cope with the m2p changing size over
>> >migration like this?
>> 
>> Indeed - migration was completely beyond my consideration when
>> submitting this. A feature flag seems the right way to go to me.
> 
> I will prepare a patch for a new feature flag.

Let me fold this into the feature handling change patch I'm close
to submit - without those changes I don't think a guest kernel would
have a way to actually announce its capability.

Jan

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