From: Avi Kivity <avi@redhat.com>
To: qemu-devel@nongnu.org
Cc: turnkey-discuss@lists.turnkeylinux.org,
Paul Brook <paul@codesourcery.com>
Subject: Re: [Qemu-devel] Merging improvements from VirtualBox OSE into qemu?
Date: Thu, 25 Dec 2008 09:06:14 +0200 [thread overview]
Message-ID: <495330E6.3040703@redhat.com> (raw)
In-Reply-To: <4952484F.6010406@turnkeylinux.org>
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)
>
>
There's nothing magical about it. Most likely they switch to 64-bit
mode immediately before entering the guest, and switch back immediately
after the guest exits. In effect their turning the host OS into a
hybrid 32/64 bit kernel (with the vast majority of the code remaining
32-bits).
--
I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.
next prev parent reply other threads:[~2008-12-25 7:11 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-12-24 12:48 [Qemu-devel] Merging improvements from VirtualBox OSE into qemu? Liraz Siri
2008-12-24 13:17 ` Samuel Thibault
2008-12-24 13:26 ` Alexey Eremenko
2008-12-24 13:31 ` Alexey Eremenko
2008-12-24 13:36 ` Paul Brook
2008-12-24 14:33 ` Liraz Siri
2008-12-24 14:51 ` Jernej Simončič
2008-12-24 15:02 ` Paul Brook
2008-12-24 15:29 ` Liraz Siri
2008-12-24 15:40 ` Anthony Liguori
2008-12-24 20:52 ` Liraz Siri
[not found] ` <E71DFB2B-0B73-46AE-B423-0BF605A9D679@hotmail.com>
2008-12-25 4:37 ` C.W. Betts
2008-12-25 7:06 ` Avi Kivity [this message]
2008-12-25 7:07 ` Avi Kivity
2008-12-25 7:08 ` Avi Kivity
2008-12-25 14:51 ` Liraz Siri
2008-12-25 16:14 ` Avi Kivity
2008-12-24 23:18 ` Jamie Lokier
2008-12-25 7:11 ` Avi Kivity
2008-12-24 15:23 ` Anthony Liguori
2008-12-24 20:21 ` Liraz Siri
2008-12-24 20:55 ` Liraz Siri
2009-01-05 21:12 ` Frank Mehnert
2009-01-05 22:03 ` Stefan Weil
2009-01-05 23:58 ` Anthony Liguori
2009-01-06 7:41 ` Frank Mehnert
2009-01-06 15:46 ` Blue Swirl
2009-01-06 17:33 ` Anthony Liguori
2009-01-06 20:40 ` Frank Mehnert
2009-01-06 22:17 ` Jamie Lokier
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