Thank you for your advice. And I compiled the libvirt-0.7.4 again ./configure make make install After reboot the machine, I run the binary virsh, the result is as below: [root@kvm bin]#virsh error: unable to connect to '/usr/local/var/run/libvirt/libvirt-sock': No such file or directory error: failed to connect to the hypervisor Then I run the virsh -c ,the result is as below: [root@kvm bin]#virsh -c qemu+unix:///system?socket=/var/run/libvirt/libvirt-sock error: unable to connect to '/var/run/libvirt/libvirt-sock': No such file or directory error: failed to connect to the hypervisor At the same time, I found the libvird didn't running, I don't know whether this caused the error or not. I don't know why this error occurs. Maybe the reason is the libvirt didn't support the use kvm virtualization on ia64 as berrange said before. But I modify the qemu_conf.c and add ia64 information into the struct arch_info_hvm. Then compiled again. The errors remain. Please forgive my poor program skills, I can't add the ia64 into the libvirt kvm supports. Will you want to do some works on this? Thanks a lot. _________________________________________________________________ Windows Live Hotmail: Your friends can get your Facebook updates, right from Hotmail®. http://www.microsoft.com/middleeast/windows/windowslive/see-it-in-action/...