Index: /trunk/doc/manual/en_US/user_AdvancedTopics.xml
===================================================================
--- /trunk/doc/manual/en_US/user_AdvancedTopics.xml	(revision 55088)
+++ /trunk/doc/manual/en_US/user_AdvancedTopics.xml	(revision 55089)
@@ -1942,4 +1942,28 @@
     <computeroutput>core.vb.&lt;ProcessName&gt;.&lt;ProcessID&gt;</computeroutput>,
     for example <computeroutput>core.vb.VBoxHeadless.11321</computeroutput>.</para>
+  </sect1>
+
+  <sect1 id="vboxandsolzvmm">
+    <title>VirtualBox and Solaris kernel zones</title>
+
+    <para>Solaris kernel zones on x86-based systems make use of hardware-assisted
+    virtualization features like VirtualBox. However, for kernel zones and
+    VirtualBox to share this hardware resource, they need to co-operate.</para>
+
+    <para>By default, due to performance reasons, VirtualBox acquires the
+    hardware-assisted virtualization resource (VT-x/AMD-V) globally on the
+    host machine and uses it until the last VirtualBox VM that requires it is
+    powered off. This prevents other software from using VT-x/AMD-V.</para>
+
+    <para>VirtualBox can be instructed to relinquish use of hardware-assisted
+    virtualization features when not executing guest code, thereby allowing
+    kernel zones to make use of them. To do this, shutdown all VirtualBox VMs
+    and execute the following command:</para>
+
+    <screen>VBoxManage setproperty hwvirtexclusive off</screen>
+
+    <para>This command needs to be executed only once as the setting is stored
+    as part of the global VirtualBox settings which will continue to persist
+    across host-reboots and VirtualBox upgrades.</para>
   </sect1>