[vbox-dev] 64-bit guest on 64-bit host

Tom Birch froody at gmail.com
Tue Oct 27 16:29:03 GMT 2009

I believe there was a paper by some vmware guys about this, but
basically AMD64 doesn't support segment limits so there's no efficient
way run the VMM inside the guest OS and still keep it hidden. It's an
issue with the actual hardware, not VirtualBox - I don't know of any
VMM today that supports 64bit guests without Intel-VT/AMD-V. This blog
post summarizes it fairly well: http://www.pagetable.com/?p=25

Except for a couple of CPU models at the start, almost every
64bit-capable x86 chip also has VT so it's not really worth trying to do it.


On Tue, Oct 27, 2009 at 8:35 AM,  <jakub007 at aster.pl> wrote:
> Hello,
> Why VirtualBox currently doesn't support running 64-bit guest OS on 64-bit
> host on CPUs without Intel-VT/AMD-V?
> What should be done to implement it and how big effort would it take to
> complete? I've got some experience
> in C/C++ and Unices and free weekends...
> Regards,
> Jakub Jozwicki
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