[libvirt][qemu] unable to start guest under kvm

Hi, all. I have the following problem: when I creating a guest, libvirt resolves <type ... machine="pc" ...> to <type ... machine="pc-0.11" ...> as provided by http://www.mail-archive.com/libvir-list@redhat.com/msg15014.html When <type ... machine="pc-0.11" ...> or <type ... machine="pc-0.10" ...> is set, I get two following errors (which would happend is unpredictable) # virsh -c qemu:///system start $d error: Failed to start domain Desktop error: internal error unable to start guest: Supported machines are: pc Standard PC (default) isapc ISA-only PC and # virsh -c qemu:///system start $d error: Failed to start domain Desktop error: monitor socket did not show up.: Connection refused When <type ... machine="pc" ...> is set, this guest starts successfully. The domain type of this machine is "kvm". But I have # qemu --version && kvm --help | head -1 QEMU PC emulator version 0.11.50, Copyright (c) 2003-2008 Fabrice Bellard QEMU PC emulator version 0.10.0 (kvm-devel), Copyright (c) 2003-2008 Fabrice Bellard on that HN. - why does libvirt sets machine to "pc-0.11" even if kvm qemu version is 0.10? - why does an error occure if I set <type ... machine="pc-0.10 ... ">