+=item B<hyperv>
+
+This is Hyper-V.
+
+Status: from MSDN description, not tested.
+
+=item B<ibm_systemz>
+
+This is an IBM SystemZ (or other S/390) mainframe. Additional
+facts listed below may also be printed.
+
+=item B<ibm_systemz-direct>
+
+This is Linux running directly on a IBM SystemZ mainframe.
+
+This is expected to be a highly unusual configuration - if
+you see this result you should treat it with suspicion.
+
+Status: not confirmed
+
+=item B<ibm_systemz-lpar>
+
+This is Linux running directly on an LPAR on an IBM SystemZ mainframe.
+
+Status: not confirmed
+
+=item B<ibm_systemz-zvm>
+
+This is a z/VM guest running in an LPAR on an IBM SystemZ mainframe.
+
+Status: confirmed by RWMJ using a Fedora guest running in z/VM
+
+=item B<linux_vserver>
+
+This process is running in a Linux VServer container.
+
+Status: contributed by Barış Metin
+
+=item B<kvm>
+
+This is KVM.
+
+Status: confirmed by RWMJ.
+