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

Nikolay Igotti Nikolay.Igotti at Sun.COM
Tue Oct 27 16:46:58 GMT 2009


 Assuming you have very high level of understanding in amd64 
architecture, and familiarity with dynamic code generation and 
development of low level software, this task could be done in 
approximately 5-8 months (as current VirtualBox already have  support 
for 64-bit addressing mode in hardware accelerated modes).
If you'll be able to do that, process of implementing this feature will 
surely be both exciting and educating.

 Techinically, you need to implement dynamic analyzer/compiler of 64-bit 
machine code, finding priviledged instructions and replacing it with 
code effectively emulating such behavior (by calling appropriate 
hypervisor functions). Simple approach is to replace all priveledged 
instructions with 0xcc (int3) and emulate behavior from trap handler, 
but this will likely yield unacceptable performance.  So better is to 
use jumps to patches placed in unused areas of guest (kernel) address space.
See PATM module for further references.

   Good luck,

jakub007 at aster.pl пишет:
> 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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> Wiadomość wysłana z ASTER - http://www.aster.pl/
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