Xen users - Apr 2009 - Suspend fails, "not managed by Xend lifecycle support"

I have a dom0 (Linux) with one domU (also Linux).  I haven''t tried
suspend and restore before, but it seems easy enough.  But when I try it
I get the error:

 % sudo xm suspend evil
 Error: Domain is not managed by Xend lifecycle support.

...Really?  I can use other xm commands to query the domU, including xm
console.  The domU had to get there somehow, and since xm is the only
way I know how to use...

What is that error really telling me?

Thanks,
-michael

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