[chef] ohai's virtualization attribute

[Bryan Berry < >]

What is ohai's virtualization attribute supposed to report?

I have a Rhel 5.7 guest running on vmware ESX.

with out vmware's paravirtualization tools installed (vmware-tools), ohais reports the following

"virtualization": {

    "role": "guest",

    "system": "vmware"

  },

on a separate machine, that does have vmware-tools installed, ohai reports the following

"virtualization": {

 },

Do the paravirtualization drivers entirely hide that the machine is running as a guest?