From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mailman by lists.gnu.org with tmda-scanned (Exim 4.43) id 1LFrYn-0003p2-Fm for qemu-devel@nongnu.org; Thu, 25 Dec 2008 09:51:37 -0500 Received: from exim by lists.gnu.org with spam-scanned (Exim 4.43) id 1LFrYm-0003om-Sq for qemu-devel@nongnu.org; Thu, 25 Dec 2008 09:51:37 -0500 Received: from [199.232.76.173] (port=44238 helo=monty-python.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1LFrYm-0003oj-Kn for qemu-devel@nongnu.org; Thu, 25 Dec 2008 09:51:36 -0500 Received: from mail.sterilesecurity.com ([173.45.227.235]:44616) by monty-python.gnu.org with esmtp (Exim 4.60) (envelope-from ) id 1LFrYm-0003Dx-9h for qemu-devel@nongnu.org; Thu, 25 Dec 2008 09:51:36 -0500 Message-ID: <49539DED.7080507@turnkeylinux.org> Date: Thu, 25 Dec 2008 16:51:25 +0200 From: Liraz Siri MIME-Version: 1.0 Subject: Re: [Qemu-devel] Merging improvements from VirtualBox OSE into qemu? References: <49522F8D.4000203@turnkeylinux.org> <200812241336.01702.paul@codesourcery.com> <4952484F.6010406@turnkeylinux.org> <49533176.4090908@redhat.com> In-Reply-To: <49533176.4090908@redhat.com> Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Reply-To: qemu-devel@nongnu.org List-Id: qemu-devel.nongnu.org List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: turnkey-discuss@lists.turnkeylinux.org Avi Kivity wrote: > 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). Sounds easy! Why, I bet one of those KVM wizards could do that over the weekend, being so smart and all... ;) Pardon my ignorance, but is it possible to switch to 64-bit mode in userspace, or do you absolutely need kernel-level support to do that? Cheers, Liraz