Now, i answer myself ...
I am using virsh with squeeze and xen-4.2+linux-3.8 (compiled)
Problem: "virsh list -all" shows VMs only in shutdown state.
(see: test3 virsh list shutdown)
virsh start/shutdown works correctly.
I suspect that version of libvirt is to old.
Is their some workaround without updating system?
...
Candidate: 0.8.3-5+squeeze2
Workaround: compile libvirt >= 1.0.3 on Dom0
(howto:
http://www2.fh-lausitz.de/launic/comp/xen/130305.xen.make.libvirt)
now i have a new problem:
see "virsh list running VMs as idle, libvirt-1.0.3 xen-4.2"
regards Heiko