http://download.virtualbox.org/virtualbox/6.0.0_BETA1/UserManual.pdf
4.5.1 Hardware 3D Acceleration (OpenGL and Direct3D 8/9)
The VirtualBox Guest Additions contain experimental hardware 3D support for Windows, Linux,
and Solaris guests.
With this feature, if an application inside your virtual machine uses 3D features through the
OpenGL or Direct3D 8/9 programming interfaces, instead of emulating them in software, which
would be slow, VirtualBox will attempt to use your host’s 3D hardware. This works for all sup-
ported host platforms, provided that your host operating system can make use of your accelerated
3D hardware in the first place.
Myslim ze on mysli na IOMMU https://cs.wikipedia.org/wiki/IOMMU