I tried to run some basic 3D games in the Debian virtual machine but I was dissapointed. Linuxkart run to a crawl, using 100% CPU power, even with main memory set to 500MB and video memory set to 64MB. Pong2, on the other hand, just froze the whole VM.
I checked which CPU the VM does see with "cat /proc/cpuinfo" and reports my host CPU, so the problem is not this but that the VM has no hardware support for 3D.
Here is a thread in VirtualBox forum discussing this subjetct and what we can espect in a medium term.
Guess I'll finally have to set up a dual boot system just to test linux 3D capabilities :(