VirtualBox inside a VM is not going to work, at least not with x64. It might 
work with x86 (32b).

Virtualization for x64 generally requires virtualization extensions (VT-x or 
so), but they aren't available inside a Qubes VM. Maybe some patches can add 
support for it (look for “nested HVM” or “nested virtualization”), at the cost 
of additional complexity and thus larger attack surface. It reportedly used to 
be impossible to implement x64 virtualization without those extensions. It 
might be possible now, but I haven't seen it being implemented.

Virtualization for x86 (32-bit) guests might work even without virtualization 
extensions. I haven't tried it, though.

If course, emulation (QEMU, DosBox, …) will work, but it is going to be slow.

Vít Šesták 'v6ak'

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