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Date: Wed, 24 Dec 2008 15:51:36 +0100
From: =?utf-8?Q?Jernej_Simon=C4=8Di=C4=8D?= <jernej@ena.si>
Message-ID: <646843313.20081224155136@ena.si>
Subject: Re: [Qemu-devel] Merging improvements from VirtualBox OSE into qemu?
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To: "Liraz Siri on [qemu-devel]" <qemu-devel@nongnu.org>

On Wednesday, December 24, 2008, 15:33:51, Liraz Siri wrote:

> I don't really understand the implementation VirtualBox uses to
> accomplish running 64bit VM guests on a 32bit host. Is it possible
> VirtualBox have figured out how to run 64bit instructions on a host
> running in 32bit mode? (otherwise they'll need to be doing some kind of
> emulation)

VirtualBox isn't the only one that supports this - VMWare also lets
you run 64bit guests on 32bit hosts.

> Testing this VirtualBox feature on hardware that doesn't support 64bit
> instructions will be revealing...

AFAIK, VirtualBox requires hardware virtualisation support for running
64bit guests, so you'll have to find a Core Duo CPU somewhere (which
are AFAIK, the only 32-bit CPUs that have hardware virtualisation
support).

--=20
< Jernej Simon=E8i=E8 ><><><><>< http://eternallybored.org/ >

If you drop something, it will never reach the ground.
       -- Femo's Law Of Automotive Engine Repairing