OLVM on VirtualBox

I'm astonished there's not post at all on OLVM yet to be found on this list. Well, here's the first one, then! :-)

I'm trying to get an R&D environment for OLVM running on my Laptop in VirtualBox (6.1.8).
Installation of the engine and one KVM host works, but as soon as I try to start the first VM, an error is thrown and the VM remains in pause mode.

The Laptop runs on an Intel Core i7 8565U CPU, which features VT-x and VT-d, the virtualization features necessary to run nested virtualization.
Nested virtualization is turned on for the KVM Host VM. "grep vmx /proc/cpuinfo" shows vmx is available.

Before i bore the heck out of you with a log file:

Has anyone here managed to run OLVM on VirtualBox?

Cheers,
Uwe

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