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[all variants] KVM or Xen for GPU pass-through?

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linux-howto

http://ubuntuforums.org – For years I've used VirtualBox to successfully run XP and Vista clients on my Ubuntu box, and am considering taking the next step to either Qemu/KVM or Xen. Have always toyed with the idea, but never made the switch because VirtualBox is so easy to use whereas KVM has always suffered from the typical Linux obscurity/learning curve. Reason: AFAIK VirtualBox is a type 2 virtualizer which runs on ring 1 whereas KVM and Xen are type 1 virtualizers running on ring 0. This allows KVM and Xen to at least theoretically pass through PCI devices to the virtualized client, thus bypassing the translation (Hardware)