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Re: [Xen-devel] save/restore/migrate kernel questions

from [Ian Campbell]

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To:	Jan Beulich <JBeulich@xxxxxxxxxx>
Subject:	Re: [Xen-devel] save/restore/migrate kernel questions
From:	Ian Campbell <Ian.Campbell@xxxxxxxxxx>
Date:	Wed, 10 Nov 2010 08:33:27 +0000
Cc:	Jeremy Fitzhardinge <jeremy@xxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>, Keir Fraser <Keir.Fraser@xxxxxxxxxxxxx>
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On Wed, 2010-11-10 at 08:07 +0000, Jan Beulich wrote:
> Jeremy: Is an off the shelf, upstream pv-ops kernel capable of
> being saved/restored/migrated? Somehow I can't seem to find the
> suspend event channel setup code...

save/restore/migration support has been in the pvops kernel since (IIRC)
the late 2.6.2x kernels and still works today. I haven't tested other
trees as widely but it is pretty solid in the latest 2.6.32.x kernels
and in the xen.git tree.

The suspend event channel is an optional extra (used to support fast
back to back checkpoint iterations, e.g. for remus) which is not
currently implemented in pvops. s/r/m works without it via the
traditional /local/domain/N/control/shutdown xenstore key.

Ian.

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