Re: [Xen-devel] [PATCH] xen: update machine_to_phys_order on resume

[Jan Beulich]

>>> On 14.07.11 at 12:26, Olaf Hering <olaf@xxxxxxxxx> wrote:
> On Wed, Jul 13, Jan Beulich wrote:
> 
>> >>> Ian Campbell <Ian.Campbell@xxxxxxxxxx> 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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