Install Libvirt 0.7.0 along with KVM creates environment with default Hypervisor QEMU . Two steps in procedure bellow makes Xen default Hypervisor on Ubuntu 9.10 . First is commenting out (xend-http-server yes) in /etc/xen/xend-config.sxp , second export variable VIRSH_DEFAULT_CONNECT_URI=”xen:///”.
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