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Unable to run libvirt with xen on Centos 6. Fails with ioctl 3166208

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http://serverfault.com – As per subject. Xen 4.2.1 libvirt 0.10.2-18.el6 Linux gatto.example.com 3.8.3-1.el6xen.x86_64 #1 SMP Sat Mar 16 15:16:57 EST 2013 x86_64 x86_64 x86_64 GNU/Linux I followed the instructions given on the Xen wiki and rebuilt the libvirt RPMS. However, when I run virsh I get: [root@gatto SPECS]# virsh capabilities error: Failed to reconnect to the hypervisor error: no valid connection error: Unable to issue hypervisor ioctl 3166208: Function not implemented Also in libvirtd.log: 2013-03-18 09:45:29.738+0000: 8973: error : xenHypervisorDoV1Op:967 : Unable to issue hypervisor ioctl 3166 (HowTos)