Comment 5 for bug 790712

@Stefan: yes, they are run on a KVM, under libvirt/qemu Natty. ON the host, these are the versions:

ii libvirt-bin 0.8.8-1ubuntu6 the programs for the libvirt library
ii libvirt0 0.8.8-1ubuntu6 library for interfacing with different virtualization systems
ii linux-image-2.6.38-8-server 2.6.38-8.42 Linux kernel image for version 2.6.38 on x86_64
ii linux-image-server 2.6.38.8.22 Linux kernel image on Server Equipment.
ii qemu-common 0.14.0+noroms-0ubuntu4.1 qemu common functionality (bios, documentation, etc)
ii qemu-kvm 0.14.0+noroms-0ubuntu4.1 Full virtualization on i386 and amd64 hardware

For the virtual machines: they were running Oneiric and linux-image-2.6.39-3-generic-pae.