[libvirt-users] The error for creating a new vm for kvm

I checked the capabilities. I do not know why the guest is only for vbox. <guest> <os_type>hvm</os_type> <arch name='i686'> <wordsize>32</wordsize> <domain type='vbox'> </domain> </arch> </guest> I want it run qemu-kvm. and when i run virsh define /etc/libvirt/qemu/demo.xml. It shows error: Failed to define domain from /etc/libvirt/qemu/demo.xml error: unknown OS type hvm Then I use virsh-install --prompt to install kvm guest, it shows error: libvirtError: this function is not supported by the connection driver: virConnectNumOfDefinedStoragePools I really do not know how to do, please help me, thanks. -- Have a nice day! Qian