Re: [Xen-devel] migration and restore?

["Andre Przywara" <andre.przywara@xxxxxxx>]

> i read the code of migration, and i fail to find the counterpart code of 
> migration , which deal with the restoration of VM in the destination 
> node, and i read the code of /tools/libxc/xc_domain_restore.c ,but the 
> function of xc_domain_restore() seems not to be the one for the 
> migration, it seems not support the restore of the iterative copy of the 
> VM memory state ,is it? or how does it deal with the work?
Maybe the missing pieces you are looking for are in the xend (Python) 
code? In line 205 (or so) in tools/pyhton/xen/xend/XendDomainInfo.py you 
will find the high level function "restore". This method calls 
XendDomainInfo.resume (line 446) and triggers the necessary actions 
here. Another file to look in is XendCheckpoint.py, here you'll find the 
method "restore" (line 154). Some Migration code is also in XendDomain.py.
You can get more info if you enable debugging, do a live migration (to 
localhost) and look in xend.log for "Saving memory pages" or "Reloading 
memory pages". From here you will find the corresponding code (maybe by 
just grepping for the log message text).
I found line 427 in xc_domain_restore.c, the code following this line 
deals with the restoring of the frames. From my perspective there is 
everything needed in there.
Hope that helps!

Regards,
Andre.

--
Andre Przywara
AMD-Operating System Research Center (OSRC), Dresden, Germany
Tel: +49 351 277-84917
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