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Re: [Xen-devel] Xen live migration

from [Tim Deegan]

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To:	Keir Fraser <keir.xen@xxxxxxxxx>
Subject:	Re: [Xen-devel] Xen live migration
From:	Tim Deegan <Tim.Deegan@xxxxxxxxxx>
Date:	Wed, 20 Apr 2011 10:21:30 +0100
Cc:	MaoXiaoyun <tinnycloud@xxxxxxxxxxx>, xen devel <xen-devel@xxxxxxxxxxxxxxxxxxx>
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At 14:20 +0100 on 19 Apr (1303222807), Keir Fraser wrote:
> On 19/04/2011 14:05, "MaoXiaoyun" <tinnycloud@xxxxxxxxxxx> wrote:
> 
> > Hi:
> >  
> >    I've been noticed that intel XSAVE is disabled in Xen source.
> >   Does this mean live migration is temporarily  not support right now?
> >   Is it for buggy reason, will be enable again someday later?
> 
> XSAVE doesn't have anything to do with live migration.

XSAVE was disabled in 22084:ae0cd4e5cc01 because the original XSAVE
support didn't include saving/restoring XSAVE contexts (i.e. it broke
live migration).  The changeset that added that support didn't re-enable
xsave. :(

The attached patch is the missing change to re-enable it by default
(totally untested). 

Cheers,

Tim.

-- 
Tim Deegan <Tim.Deegan@xxxxxxxxxx>
Principal Software Engineer, Xen Platform Team
Citrix Systems UK Ltd.  (Company #02937203, SL9 0BG)

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