On Tuesday 14 December 2010, Robert P. J. Day wrote: > i'm reading the 4.0.0 beta user manual, "3.1.2 64-bit guests", and > it states in point 1 that, in order to have a 64-bit guest OS, you > *need* a 64-bit processor with HW virtualization support. > > the last part of point 3, however, claims that on 64-bit hosts, > 64-bit guest support is always enabled. but what if you have a 64-bit > system without HW virt support? then these two claims would seem to > be slightly contradictory.
The last sentence is indeed not 100% clear. You definitely need VT-x or AMD-V for 64-bit guest support. This is just a restriction of the implementation of the VirtualBox VMM. Of course it would be possible to make 64-bit guests work on non-VT-x/AMD-V hardware but we saved the effort as the most processors have support for this hardware extension in these days. Kind regards, Frank -- ORACLE Deutschland B.V. & Co. KG Dr.-Ing. Frank Mehnert Werkstrasse 24 Staff Engineer, VirtualBox 71384 Weinstadt, Germany mailto:[email protected] Hauptverwaltung: Riesstr. 25, D-80992 München Registergericht: Amtsgericht München, HRA 95603 Komplementärin: ORACLE Deutschland Verwaltung B.V. Rijnzathe 6, 3454PV De Meern, Niederlande Handelsregister der Handelskammer Midden-Niederlande, Nr. 30143697 Geschäftsführer: Jürgen Kunz, Marcel van de Molen, Alexander van der Ven
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