[gnome-boxes] Add USB support in new VMs if supported

[Alexander Larsson <alexl src gnome org>]

commit 5803906dcdc8960ae18efc2464290c5a58ed6051
Author: Alexander Larsson <alexl redhat com>
Date:   Mon Nov 5 17:09:47 2012 +0100

    Add USB support in new VMs if supported
    
    If qemu is new enough to fully support usb redirection, add support
    for it (i.e. 4 redirection channels and usb2 controllers) to all new
    VMs.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=672268

 src/vm-configurator.vala |   38 ++++++++++++++++++++++++++++++++++++++
 1 files changed, 38 insertions(+), 0 deletions(-)
---
diff --git a/src/vm-configurator.vala b/src/vm-configurator.vala
index b7ddc92..952462e 100644
--- a/src/vm-configurator.vala
+++ b/src/vm-configurator.vala
@@ -74,6 +74,10 @@ private class Boxes.VMConfigurator {
         channel.set_source (vmc);
         domain.add_device (channel);
 
+        // Only add usb support if we'er 100% sure it works, as it breaks migration (i.e. save) on older qemu
+        if (Config.HAVE_USBREDIR)
+            add_usb_support (domain);
+
         set_video_config (domain, install_media);
         set_sound_config (domain, install_media);
         set_tablet_config (domain, install_media);
@@ -291,6 +295,40 @@ private class Boxes.VMConfigurator {
         return null;
     }
 
+    public static void add_usb_support (Domain domain) {
+        // 4 USB redirection channels
+        for (int i = 0; i < 4; i++) {
+            var usb_redir = new DomainRedirdev ();
+            usb_redir.set_bus (DomainRedirdevBus.USB);
+            var vmc = new DomainChardevSourceSpiceVmc ();
+            usb_redir.set_source (vmc);
+            domain.add_device (usb_redir);
+        }
+
+        // USB controllers
+        var master_controller = create_usb_controller (DomainControllerUsbModel.ICH9_EHCI1);
+        domain.add_device (master_controller);
+        var controller = create_usb_controller (DomainControllerUsbModel.ICH9_UHCI1, master_controller, 0, 0);
+        domain.add_device (controller);
+        controller = create_usb_controller (DomainControllerUsbModel.ICH9_UHCI2, master_controller, 0, 2);
+        domain.add_device (controller);
+        controller = create_usb_controller (DomainControllerUsbModel.ICH9_UHCI3, master_controller, 0, 4);
+        domain.add_device (controller);
+    }
+
+    private static DomainControllerUsb create_usb_controller (DomainControllerUsbModel model,
+                                                              DomainControllerUsb?     master = null,
+                                                              uint                     index = 0,
+                                                              uint                     start_port = 0) {
+        var controller = new DomainControllerUsb ();
+        controller.set_model (model);
+        controller.set_index (index);
+        if (master != null)
+            controller.set_master (master, start_port);
+
+        return controller;
+    }
+
     private static CapabilitiesGuest get_best_guest_caps (Capabilities caps, InstallerMedia install_media)
                                                           throws VMConfiguratorError {
         var guests_caps = caps.get_guests ();