Getting VirtualBox Guest Additions to run on Xen

[Melab]

Currently, I'm running Ubuntu 15.04 (Linux 3.19.0-26-generic) on Windows so I can screw around with Xen's features. I'm running VirtualBox 4.3.30 and all I really need is for the screen to resize itself whenever I maximize the virtual machine's window. Up until this morning, although I would get a pop-up box saying:

VBoxClient: the VirtualBox kernel service is not running. Exiting.

the screen would still adjust to fit the window after logging in if I booted up Xen. Now, it's not doing that anymore (the resizing bit).

Here are some parts of the file /var/log/boot.log that mention VirtualBox components:

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         Starting LSB: VirtualBox Linux X11 Additions...
[  OK  ] Started LSB: VirtualBox Linux X11 Additions.
…
         Starting LSB: VirtualBox Linux Additions...
[FAILED] Failed to start LSB: VirtualBox Linux Additions.
See "systemctl status virtualbox-guest-utils.service" for details.

Here is the output of "systemctl status -l virtualbox-guest-utils.service":

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● virtualbox-guest-utils.service - LSB: VirtualBox Linux Additions
   Loaded: loaded (/etc/init.d/virtualbox-guest-utils)
   Active: failed (Result: exit-code) since Sun 2015-08-23 15:24:37 EDT; 2min 28s ago
     Docs: man:systemd-sysv-generator(8)
  Process: 538 ExecStart=/etc/init.d/virtualbox-guest-utils start (code=exited, status=1/FAILURE)

Aug 23 15:24:22 ubuntu systemd[1]: Starting LSB: VirtualBox Linux Additions...
Aug 23 15:24:23 ubuntu virtualbox-guest-utils[538]: * Starting VirtualBox Additions
Aug 23 15:24:37 ubuntu virtualbox-guest-utils[538]: * modprobe vboxguest failed. Please use 'dmesg' to find out why
Aug 23 15:24:37 ubuntu virtualbox-guest-utils[538]: ...fail!
Aug 23 15:24:37 ubuntu systemd[1]: virtualbox-guest-utils.service: control process exited, code=exited status=1
Aug 23 15:24:37 ubuntu systemd[1]: Failed to start LSB: VirtualBox Linux Additions.
Aug 23 15:24:37 ubuntu systemd[1]: Unit virtualbox-guest-utils.service entered failed state.
Aug 23 15:24:37 ubuntu systemd[1]: virtualbox-guest-utils.service failed.

Here is what the output of "dmesg" says:

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[   19.667378] VBoxGuestInitDevExt: VBoxGuestInfo failed, rc=-1
[   19.667965] vboxguest: VBoxGuestInitDevExt failed with rc=-1

Running "sudo VBoxClient --display" gives me a pop-up box saying:

VBoxClient: Failed to connect to the VirtualBox kernel service, rc=VERR_FILE_NOT_FOUND

Any attempts to use modprobe to load vboxsf.ko or vboxguest.ko fail:

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modprobe: ERROR: could not insert 'vboxguest': Resource deadlock avoided
modprobe: ERROR: could not insert 'vboxguest': Resource deadlock avoided

I installed my VirtualBox Guest Additions using apt-get:

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sudo apt-get install virtualbox-guest-dkms virtualbox-guest-utils virtualbox-guest-x11

[Perryg]

Aside from you using the repo version of the guest additions ( not supported here ), VirtualBox does not support nested virtualization.

[sjfloat]

Melab: Did you make any progress on this? If not the guest additions, then Xen on Virtualbox in general?