+This is Microsoft Hyper-V hypervisor.
+
+Status: confirmed by RWMJ
+
+=item B<ibm_power-kvm>
+
+This is an IBM POWER KVM guest.
+
+Status: contributed by Adrian Likins.
+
+=item B<ibm_power-lpar_shared>
+
+=item B<ibm_power-lpar_dedicated>
+
+This is an IBM POWER LPAR (hardware partition) in either shared
+or dedicated mode.
+
+Status: contributed by Adrian Likins.
+
+=item B<ibm_systemz>
+
+This is an IBM SystemZ (or other S/390) hardware partitioning system.
+Additional facts listed below may also be printed.
+
+=item B<ibm_systemz-direct>
+
+This is Linux running directly on a IBM SystemZ hardware partitioning
+system.
+
+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
+hardware partitioning system.
+
+Status: not confirmed
+
+=item B<ibm_systemz-zvm>
+
+This is a z/VM guest running in an LPAR on an IBM SystemZ
+hardware partitioning system.
+
+Status: confirmed by RWMJ using a Fedora guest running in z/VM
+
+=item B<linux_vserver>
+
+This is printed for backwards compatibility with older virt-what which
+could not distinguish between a Linux VServer container guest and
+host.
+
+=item B<linux_vserver-guest>
+
+This process is running in a Linux VServer container.
+
+Status: contributed by Barış Metin
+
+=item B<linux_vserver-host>
+
+This process is running as the Linux VServer host (VxID 0).
+
+Status: contributed by Barış Metin and Elan Ruusamäe