On Tue, Nov 08, 2011 at 04:57:04PM +0200, Avi Kivity wrote: > > Running qemu -snapshot on the actual root block device is the only > > safe way to reuse the host installation, although it gets a bit > > complicated if people have multiple devices mounted into the namespace. > > How is -snapshot any different? If the host writes a block after the > guest has been launched, but before that block was cowed, then the guest > will see the new block.
Right, thinko - qemu's snapshots are fairly useless due to sitting ontop of the file to be modified. > It could work with a btrfs snapshot, but not everyone uses that. Or LVM snapshot. Either way, just reusing the root fs without care is a dumb idea, and I really don't want any tool or script that encurages such braindead behaviour in the kernel tree.
