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RE: [Xen-devel] save image file format? and [RFC] tmem save/restore/migr

To: Tim Deegan <Tim.Deegan@xxxxxxxxxx>
Subject: RE: [Xen-devel] save image file format? and [RFC] tmem save/restore/migrate
From: Dan Magenheimer <dan.magenheimer@xxxxxxxxxx>
Date: Thu, 18 Jun 2009 16:25:40 -0700 (PDT)
Cc: Gianluca Guida <Gianluca.Guida@xxxxxxxxxxxxx>, "Xen-Devel \(E-mail\)" <xen-devel@xxxxxxxxxxxxxxxxxxx>, John Levon <levon@xxxxxxxxxxxxxxxxx>
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> BTW, the HVM save records supplied by Xen to libxc _are_
> self-identifying and extensible (and there's room in the header for a
> version number, though by sticking to the principle of only 
> transferring
> architectural state we've avoided the need to use it so far).  But
> they're just dropped into the stream after the memory pages and before
> xend glues on the qemu record.

Semi-related, does this mean that HVM live migrate
is fully-compatible between versions of Xen, e.g.
either way between a Xen 3.1 machine and a Xen 3.4
machine and back again, even though new fields
(TSS? EPT?) are in the save record?

Thanks,
Dan

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