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.
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