Description of problem:
Since I have some problems with qemu-kvm-0.12.4 I was told to try qemu.git. It seems that libvirt parses the version number only in the brackets, e.g. qemu-kvm-0.12.4 returns
> QEMU PC emulator version 0.12.4 (qemu-kvm-0.12.4), Copyright (c) 2003-2008 Fabrice Bellard
but qemu.git returns
> QEMU emulator version 0.12.50 (qemu-kvm-devel), Copyright (c) 2003-2008 Fabrice Bellard
Use qemu.git instead of an official release of QEMU.
libvirt doesn't start the virtual machine at all, it returns the following error (syslog):
> libvirtd: error : qemudParseHelpStr:1341 : internal error cannot parse /usr/bin/qemu-kvm version number in 'QEMU emulator version 0.12.50 (qemu-kvm-devel), Copyright (c) 2003-2008 Fabrice Bellard'
libvirt should start qemu.git just like every other release of QEMU.
This is fixed upstream, a release just hasn't been cut yet. It should be within a couple weeks.
Don't know the exact commit, but this has been fixed for a few releases. Closing.