[linux-lvm] LVM but no real partitions

[Xen]

Did people ever consider whether it was worth being able to start a PV 
on a raw physical device with a small offset to reserve room for a boot 
sector?

If you could create a PV on a bootdisk with a 2048 sector offset, you 
would have a bootable device without partition tables and only LVM.

The same applies to LUKS. If you could put the LUKS header at 2048 
sectors, you could boot a disk with nothing but a luks container, since 
grub2 understands LUKS.

I guess such a thing would be extremely easy to achieve, it just 
wouldn't be portable.

Since you may need to recompile both LUKS and Grub, and possibly even 
dm-crypt.

The total number of changes would probably not be more than 10 lines. 
Not sure.

Anyway.

Anyone ever fancied a LVM system without real partitions?