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RE: [Xen-devel] HVM live migration status?

  • To: "Pasi Kärkkäinen" <pasik@xxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxx
  • From: "Petersson, Mats" <Mats.Petersson@xxxxxxx>
  • Date: Mon, 12 Feb 2007 12:17:14 +0100
  • Delivery-date: Mon, 12 Feb 2007 03:18:48 -0800
  • List-id: Xen developer discussion <xen-devel.lists.xensource.com>
  • Thread-index: AcdNFrxiiE8Sl0j3SAS2fYAwmRQDXwBgBGUg
  • Thread-topic: [Xen-devel] HVM live migration status?

> -----Original Message-----
> From: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx 
> [mailto:xen-devel-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of 
> Pasi Kärkkäinen
> Sent: 10 February 2007 13:22
> To: xen-devel@xxxxxxxxxxxxxxxxxxx
> Subject: [Xen-devel] HVM live migration status?
> Hi list!
> What's the status of HVM live migration.. any patches floating around?
> I guess HVM save/restore starts to be at the point where 
> people could start
> playing with the migration..

You could possibly play with migration, but I think Live migration is a bit in 
the future - it require shadow paging to support log-dirty, which is currently 
not supported - because for live migration, you keep the old domain running 
whilst starting the new one, and to understand what has changed since the start 
of migration until "handover", you need to know which pages of memory has been 
modified during the "copy" of memory. 

Currently live migration is "early abort" in xc_hvm_save() - it checks the 
"live" flag and says "Can't do Live save". But that's a small patch, compared 
to supporting log-dirty. 

> -- Pasi
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