[libvirt] Would it make sense to have a <disk device='logicalvolume'>?

The questions is this: 1) would it make sense to expose a block device in the host to be mapped like a "logical volume" in the guest (I mean: not actually exposing it as a physical disk)? 2) Is there any existing hypervisor that could be made to work like this? Example scenario: Just suppose I have a real logical volume in the *host* called "/dev/mapper/domain0_home" (it could be any block device, but this would be a real useful configuration). Consider the following hypothetical libvirt configuration: <disk type='block' device='lv'> <source dev='/dev/mapper/domain0_home'/> <target dev='home' bus='virtio'/> </disk> 'lv' stands for "logicavolume". The block device should be automatically mapped in the *guest* as "/dev/mapper/home", and not advertised as a physical disk.