[libvirt-users] Can I run a KVM guest with a btrfs subvolume as file system?

Hi, I want to run a virtualized Debian stable KVM guest on a Debian stable host (to run untrusted stuff like Skype, Flash or eclipse with third-party plugins). Naturally host and guest will have many files in common and it would be nice to make us of btrfs deduplication. Now I found "direct kernel boot" but I could not find any documentation about it. Does it allow me to hand a btrfs subvolume of the host file system to the guest and the guest uses this subvolume as its own file system? I already asked this question here: http://serverfault.com/questions/536752/can-i-run-a-kvm-guest-with-a-btrfs- subvolume-as-file-system Regards, Thomas Koch