[Libguestfs] [PATCH v2 5/8] v2v: -o libvirt: Add virtio-rng, balloon and pvpanic to output XML (RHBZ#1438794).

[Richard W.M. Jones]

When outputting libvirt XML, create virtio-rng, a memory balloon
device, and a pvpanic device, if the guest supports it.

Thanks: Daniel Berrangé for advice on memballoon
---
 v2v/create_libvirt_xml.ml | 26 ++++++++++++++++++++++++++
 v2v/test-v2v-i-ova.xml    |  4 ++++
 2 files changed, 30 insertions(+)

diff --git a/v2v/create_libvirt_xml.ml b/v2v/create_libvirt_xml.ml
index fc7196595..246cacd21 100644
--- a/v2v/create_libvirt_xml.ml
+++ b/v2v/create_libvirt_xml.ml
@@ -338,6 +338,32 @@ let create_libvirt_xml ?pool source target_buses guestcaps
          [] in
   append devices sound;
 
+  (* Miscellaneous KVM devices. *)
+  if guestcaps.gcaps_virtio_rng then
+    push_back devices (
+      e "rng" ["model", "virtio"] [
+        (* XXX Using /dev/urandom requires libvirt >= 1.3.4.  Libvirt
+         * was broken before that.
+         *)
+        e "backend" ["model", "random"] [PCData "/dev/urandom"]
+      ]
+    );
+  (* For the balloon device, libvirt adds an implicit device
+   * unless we use model='none', hence this:
+   *)
+  push_back devices (
+    e "memballoon"
+      ["model",
+       if guestcaps.gcaps_virtio_balloon then "virtio" else "none"]
+      []
+  );
+  if guestcaps.gcaps_isa_pvpanic then
+    push_back devices (
+      e "panic" ["model", "isa"] [
+        e "address" ["type", "isa"; "iobase", "0x505"] []
+      ]
+    );
+
   (* Standard devices added to every guest. *)
   append devices [
     e "input" ["type", "tablet"; "bus", "usb"] [];
diff --git a/v2v/test-v2v-i-ova.xml b/v2v/test-v2v-i-ova.xml
index 1a31c44d5..4b5f615c9 100644
--- a/v2v/test-v2v-i-ova.xml
+++ b/v2v/test-v2v-i-ova.xml
@@ -37,6 +37,10 @@
       <model type='qxl' ram='65536' heads='1'/>
     </video>
     <graphics type='vnc' autoport='yes' port='-1'/>
+    <rng model='virtio'>
+      <backend model='random'>/dev/urandom</backend>
+    </rng>
+    <memballoon model='virtio'/>
     <input type='tablet' bus='usb'/>
     <input type='mouse' bus='ps2'/>
     <console type='pty'/>
-- 
2.12.0