From mboxrd@z Thu Jan 1 00:00:00 1970 From: Tim Deegan Subject: Re: page table question! Date: Sun, 16 Dec 2007 11:55:10 +0000 Message-ID: <20071216115510.GA25366@york.uk.xensource.com> References: <907625E08839C4409CE5768403633E0B02561E12@sefsexmb1.amd.com> <200706131735.30820.mark.williamson@cl.cam.ac.uk> <20070614082755.GB15027@york.uk.xensource.com> <475AA9A9.4050103@sina.com.cn> <1197125421.27734.13.camel@thinkpad.localdomain> <47649685.2030709@ncic.ac.cn> Mime-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Return-path: Content-Disposition: inline In-Reply-To: <47649685.2030709@ncic.ac.cn> List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xensource.com Errors-To: xen-devel-bounces@lists.xensource.com To: tgh Cc: "Petersson, Mats" , xen-devel@lists.xensource.com, Mark Williamson , Daniel Stodden , MT Rezaie List-Id: xen-devel@lists.xenproject.org At 11:07 +0800 on 16 Dec (1197803269), tgh wrote: > nested page table ,for the AMD NPT ,is stored in the dom0 linear space, > not in the hypervisor virtual address ,is it? or what is the meaning of > "that's one major benefit of nested paging: counteraction "address space > compression".",and what about the Intel EPT, is it similar ,or how does > it work, I am still comfused about the hypervisor' limited virtual > address space, it wont be used for storing the EPT or NPT, is it? or > what about the hypervisor's virtual address space in the AMD or > Intel-vt?how much space is it? or what is tricks behind, could you give > me a more detailed explanation about NPT and EPT NPT is described in volume 2 of AMD's Architecture Programmer's Manual. http://www.amd.com/us-en/Processors/TechnicalResources/0,,30_182_739_7044,00.html I don't know of any publically available documentation on EPT, but there are some details in Jun Nakajima's slides from the recent Xen Summit. http://xen.org/xensummit/xensummit_fall_2007.html Tim. -- Tim Deegan Principal Software Engineer, Citrix Systems. [Company #5334508: XenSource UK Ltd, reg'd c/o EC2Y 5EB, UK.]