[libvirt] [PATCH] docs: document how to disable memballoon

[Eric Blake]

https://bugzilla.redhat.com/show_bug.cgi?id=623903 documents a qemu
bug that causes libvirt to hang if virt-manager happens to be
querying balloon info when a guest is paused.  Until the qemu bug
is fixed, people need to know how to avoid the issue.

* docs/formatdomain.html.in (Memory balloon device): Mention
model='none'.
---
 docs/formatdomain.html.in |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/docs/formatdomain.html.in b/docs/formatdomain.html.in
index 8ec7446..a4821e1 100644
--- a/docs/formatdomain.html.in
+++ b/docs/formatdomain.html.in
@@ -1646,6 +1646,9 @@ qemu-kvm -net nic,model=? /dev/null
       need to explicitly add this element in the guest XML unless a
       specific PCI slot needs to be assigned.
       <span class="since">Since 0.8.3, Xen, QEMU and KVM only</span>
+      Additionally, <span class="since">since 0.8.4</span>, if the
+      memballoon device needs to be explicitly disabled,
+      <code>model='none'</code> may be used.
     </p>

     <p>
-- 
1.7.2.3