The unstable tree is a non-starter for save/restore right now (or at
least, it definitely is for live migration). The SMP additions broke
certain other features which haven't yet been fixed again.
There are definitely save/restore bugs in 2.0, but we aim to fix those
soon. 
 -- Keir
> I've tried unstable tarball in the hope it will solve my problems with 
> non-working save / migrate on my machine, but using unstable branch, 
> domU ends in kernel panic just from start.
>
> Because errors occure in every Xen version i've tested so far, i suspect 
> there is some hardware problem (maybe, but not probable, i had problems 
> with save/migrate on all machines), or some incompatibility with certain 
> gcc/glibc/whatever combination or maybe some obvious error in my 
> dom0/domU kernel configuration (the same config worked - without 
> save/migrate - on 2.0.3). Diff shows only slight changes between my 
> config and the default one - cpu type, some device drivers and 
> networking options.
>
> Machine is built from common hardware - amd cpu, via kt600 chipset. 
> There are 5 PCI add-on cards and only one empty PCI slot. Maybe there is 
> IRQ routing problem?
>
> If required, i can post additional data (output from ksymoops, both 
> kernel, System.map files etc.)
>
> Dave
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