From mboxrd@z Thu Jan 1 00:00:00 1970 From: Tim Deegan Subject: Re: PV guest + shadow paging Date: Wed, 24 Oct 2007 09:21:38 +0100 Message-ID: <20071024082138.GD23658@york.uk.xensource.com> References: <20070728115823.HM.0000000000000PK@levin.johnson.bos-mail-wwl24.lycos.com> <8A87A9A84C201449A0C56B728ACF491E2600F1@liverpoolst.ad.cl.cam.ac.uk> <1185777299.4314.25.camel@cthulhu.hellion.org.uk> <20070730081523.GA24708@york.uk.xensource.com> <471C82FA.7040104@ncic.ac.cn> <20071022112048.GC23658@york.uk.xensource.com> <471ECAEB.6000009@goop.org> Mime-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Return-path: Content-Disposition: inline In-Reply-To: <471ECAEB.6000009@goop.org> List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xensource.com Errors-To: xen-devel-bounces@lists.xensource.com To: Jeremy Fitzhardinge Cc: Ian Campbell , Ian Pratt , Levin Johnson , xen-devel@lists.xensource.com List-Id: xen-devel@lists.xenproject.org At 21:32 -0700 on 23 Oct (1193175163), Jeremy Fitzhardinge wrote: > Tim Deegan wrote: > > A shadow pagetable mode where Xen does the translation between > > guest-physical and machine-physical addresses for PV guests. Normally > > PV guests do that translation themselves, because it's faster, and Xen > > does it for HVM guests because they can't do it themseves. > > > > I think we'll need it to take advantage of NPT/EPT though, right? The joy of NPT(VMI?)/EPT is that you don't need shadow pagetables at all. :) Tim. -- Tim Deegan , XenSource UK Limited Registered office c/o EC2Y 5EB, UK; company number 05334508