This reverts commit df645c22cc. KVM 1.1.0 breaks several VM builds. The NixOS installer tests hang: http://hydra.nixos.org/build/2763935 but worse, some builds give random failures indicating corruption: http://hydra.nixos.org/build/2776221 http://hydra.nixos.org/build/2776180 http://hydra.nixos.org/build/2769347 http://hydra.nixos.org/build/2769337
df645c22cc
creating corrupt VirtualBox images. (https://bugs.launchpad.net/qemu/+bug/919242) svn path=/nixpkgs/trunk/; revision=32560