[gnome-boxes] installer-media: Implement prefers_q35

[Felipe Borges <felipeborges src gnome org>]

commit d9b20efbba3a6b849fc2161ae05144ff6da3d827
Author: Fabiano Fidêncio <fidencio redhat com>
Date:   Thu Oct 11 18:30:06 2018 +0200

    installer-media: Implement prefers_q35
    
    We should prefer q35 whenever it's supported.
    
    Related: https://bugzilla.redhat.com/show_bug.cgi?id=1581422
    
    Signed-off-by: Fabiano Fidêncio <fidencio redhat com>

 src/installer-media.vala | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)
---
diff --git a/src/installer-media.vala b/src/installer-media.vala
index 4a8d913e..5bde3cae 100644
--- a/src/installer-media.vala
+++ b/src/installer-media.vala
@@ -51,7 +51,17 @@
 
     public bool prefers_q35 {
         get {
-            return false;
+            if (os == null)
+                return true;
+
+            var device = find_device_by_prop (supported_devices, DEVICE_PROP_NAME, "qemu-x86-q35");
+            if (device == null)
+                return false;
+
+            if (supports_virtio_net && !supports_virtio1_net)
+                return false;
+
+            return true;
         }
     }