>I also hope to see UEFI reimplemented as a resident domU, such that a plain old desktop or notebook computer could treat its user OS as a container-image to be

>I also hope to see UEFI reimplemented as a resident domU, such that a plain old desktop or notebook computer could treat its user OS as a container-image to be slung around, rather than having it "own" the hardware. UEFI actually already supports this mode of operation--allowing you to boot "UEFI applications" that keep UEFI around to provide BIOS-like functionality--but I don't know of a single OS that makes use of that, rather than overwriting the processor interrupt vectors and claiming all of physical memory for itself. This is really the opposite direction things are going, especially in x86_64. PV is horrendously inefficient in 64 bit mode, because of the removal of CPU ring 1 and 2. http://wiki.xen.org/wiki/Virtualization_Spectrum#Problems_with_paravirtualization:_AMD_and_x86-64 http://wiki.xen.org/wiki/Virtualization_Spectrum#Problems_wi... HVM allows PCI passthrough if your CPU and chipset support it, which means domU now has direct access to the hardware, with no dom0/qemu layer to get in the way and slow things down.