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?