From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ivan Kelly Subject: Re: Guest OS without paging Date: Wed, 9 Nov 2005 13:31:07 +0000 Message-ID: <20051109133046.GC5157@localhost.localdomain> References: <20051107001154.GA10721@localhost.localdomain> <200511071726.20118.mark.williamson@cl.cam.ac.uk> <20051107185425.GC7339@localhost.localdomain> <200511091319.10818.mark.williamson@cl.cam.ac.uk> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: <200511091319.10818.mark.williamson@cl.cam.ac.uk> List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xensource.com Errors-To: xen-devel-bounces@lists.xensource.com To: Mark Williamson Cc: Ivan Kelly , xen-devel@lists.xensource.com List-Id: xen-devel@lists.xenproject.org On Wed, Nov 09, 2005 at 01:19:10PM +0000, Mark Williamson wrote: > Out of interest, what exactly does it do with segmentation? Most CPUs don't > have segmentation hardware at all... I can imagine ways they might have > overlaid it on the flat memory model without affective other ports though... > Task isolation? Kernel / user protection? I haven't looked too deeply into the segmentation, but it's using a GDT so it is doing something with it. I'll update you when i find out more. Regards Ivan