Comment 61 for bug 156085

I've built kvm-74 with a patch to support the dev file-system natively without any work-arounds. You can get it from my PPA:

https://launchpad.net/~intuitivenipple/+archive?field.name_filter=kvm&field.status_filter=published

Make sure to install the Ubuntu kvm package first since my package currently only contains kvm userspace, not the kernel module.