support gpu passthrough
@matthiasc
Submitted by Matthias Clasen Link to original bug (#746345)
Description
Boxes should detect if the system has a dedicated high-end gpu (like nvidia quadro >=fermi, grid or tesla), and allow to use this gpu exclusively for a vm.
libvirt supports this, the gpu can be assigned like any other pci device.
for finding the gpu, just enumerate pci devices.