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Re: [Xen-devel] Buggy interaction of live migration and p2m updates

To: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Xen-devel List <xen-devel@xxxxxxxxxxxxx>
From: David Vrabel <david.vrabel@xxxxxxxxxx>
Date: Mon, 1 Dec 2014 14:38:23 +0000
Cc: Juergen Gross <JGross@xxxxxxxx>, Wei Liu <wei.liu2@xxxxxxxxxx>, Ian Campbell <Ian.Campbell@xxxxxxxxxx>, Tim Deegan <tim@xxxxxxx>, Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx>, David Vrabel <david.vrabel@xxxxxxxxxx>, Jan Beulich <JBeulich@xxxxxxxx>, Shriram Rajagopalan <rshriram@xxxxxxxxx>, Hongyang Yang <yanghy@xxxxxxxxxxxxxx>
Delivery-date: Mon, 01 Dec 2014 14:39:50 +0000
List-id: Xen developer discussion <xen-devel.lists.xen.org>

On 20/11/14 18:28, Andrew Cooper wrote:
> 
> 1) Freeze the guests p2m during live migrate
> 2) Deep p2m dirty tracking
> 3) Eagerly check for p2m structure changes.
> 4) Request p2m structure change updates from the guest

> Proposed solution:  A combination of 2, 3 and 4.

Option 5: don't change anything.  PV guests and toolstacks are
well-behaved and ensure that p2m updates do not occur during domain save.

We have never supported migrating non-cooperative PV guests.

I'd be more interested fixing this for HVM guests.

David

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