My linux is rhel 5.4. In it, the version of kvm is 83 and the qemu is 0.9.1. Virt-manager and libvirt use "/usr/libexec/qemu-kvm" to manage VMs. Now, I want to use the higher version of kvm, so I download qemu-kvm-0.12.4.tar.gz. tar xvf qemu-kvm-0.12.4.tar.gz cd qemu-kvm-0.12.4 ./configure --prefix=/usr/ make make install Then, qemu-system-x86_86 is appeared, but the executalbe file "qemu-kvm" is not generated. Virt-manager an libvirt do not use "qemu-system-x86_86", they only use "qemu-kvm". What should I do when I want to update kvm for using libvirt in thel 5.4. Maybe I can compile a new "qemu-kvm" to substitute the old one. Thank you for your reply! Best wishes!