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

[Anton Protopopov]

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 ... ">
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