Actually, most VServers don't need much boot and/or system-level stuff.
You could say it runs only starts/runs those scripts which usually get run at init level 2 or 3.
VServers don't handle anything them selfs, like mounting /tmp or setting up networking. The /dev directory is mostly empty only null and zero and stuff like are needed.
Yes, going from physical to vserver might be more work (stripping out stuff you don't need). I've never seen any problems with kernel-dependencies.
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