References: bnc#885308
Enhancement to add a virtio RNG device to non windows VMs.
Index: virt-manager-1.4.0/virtinst/guest.py
===================================================================
--- virt-manager-1.4.0.orig/virtinst/guest.py
+++ virt-manager-1.4.0/virtinst/guest.py
@@ -39,6 +39,7 @@ from .devicedisk import VirtualDisk
 from .devicegraphics import VirtualGraphics
 from .deviceinput import VirtualInputDevice
 from .deviceredirdev import VirtualRedirDevice
+from .devicerng import VirtualRNGDevice
 from .devicevideo import VirtualVideoDevice
 from .distroinstaller import DistroInstaller
 from .domainblkiotune import DomainBlkiotune
@@ -655,6 +656,15 @@ class Guest(XMLBuilder):
             return
         self.add_device(VirtualGraphics(self.conn))
 
+    def add_default_rng(self):
+        osvar = self._get_os_variant()
+        if not self.conn.is_qemu() or not osvar or osvar.startswith("win"):
+            return
+        rng_dev = VirtualRNGDevice(True)
+        rng_dev.type = VirtualRNGDevice.TYPE_RANDOM
+        setattr(rng_dev, "device", "/dev/random")
+        self.add_device(rng_dev)
+
     def add_default_devices(self):
         self.add_default_graphics()
         self.add_default_video_device()
@@ -662,6 +672,7 @@ class Guest(XMLBuilder):
         self.add_default_console_device()
         self.add_default_usb_controller()
         self.add_default_channels()
+        self.add_default_rng()
 
     def _add_install_cdrom(self):
         if self._install_cdrom_device: