Install Qubes OS as Standalone VM / Nested Virtualization

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You might want to give the tweaks I wrote about here (i.e. for installing an operational instance of Qubes OS inside Oracle VirtualBox) a try for your Qubes-OS-in-Qubes-OS installation.

Without requiring nested virtualization, i.e. using only PV virtualization mode, it does work to a certain extent. However I couldn’t get sys-net to work properly. See the screenshot below:

A screenshot of an HVM window with Qubes OS 4.2.2 running as a guest. The window has the black-label Xfwm4 decoration as a proof of it being a Xen HVM. The default Xfce4 desktop is showcased without any GUI personalization, and shows several windows and a tray icon from PV guests running.
A screenshot of an HVM window with Qubes OS 4.2.2 running as a guest. The window has the black-label Xfwm4 decoration as a proof of it being a Xen HVM. The default Xfce4 desktop is showcased without any GUI personalization, and shows several windows and a tray icon from PV guests running.1032×796 109 KB

Note: there might be some additional tweaks required, that I’m just not aware of, and they are the roadblocks for this case.