For testing purposes I've tried to use pve inside a kvm guest, but if I try to create a openvz container with a bridged interface, the pve instance shuts down. To solve this problem I changed the nic from virtio to e1000. That solved the problem. Where the problem is I don't know, neither do I have the necessary skills nor the time to figure out what the problem is. The hostos I'm using is Ubuntu 9.10 x64. The pve guest was created as a GNU/Debian Lenny guest with virt-manager.