From mboxrd@z Thu Jan 1 00:00:00 1970 From: Avi Kivity Subject: Re: kvm_mmu doubts Date: Sat, 05 Jul 2008 13:58:14 +0300 Message-ID: <486F53C6.3070603@qumranet.com> References: <2452.10.9.1.37.1214831194.squirrel@www.cse.iitb.ac.in> <4868E2C6.2040005@qumranet.com> <3049.10.9.1.37.1214845847.squirrel@www.cse.iitb.ac.in> <48693B32.802@qumranet.com> <1202.10.9.1.37.1214889624.squirrel@www.cse.iitb.ac.in> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Cc: kvm@vger.kernel.org To: Sukanto Ghosh Return-path: Received: from il.qumranet.com ([212.179.150.194]:50585 "EHLO il.qumranet.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750722AbYGEK6Q (ORCPT ); Sat, 5 Jul 2008 06:58:16 -0400 In-Reply-To: <1202.10.9.1.37.1214889624.squirrel@www.cse.iitb.ac.in> Sender: kvm-owner@vger.kernel.org List-ID: Sukanto Ghosh wrote: >> Sukanto Ghosh wrote: >> >>> I am calling the entire tree-like structure (including the page >>> directories) as a page table. In the above statement are you referring >>> to >>> the same ? Or is it the last-level table that holds translated physical >>> addresses (+ dirty bit, etc ) ? >>> >>> >> No, any guest page that is part of the structure. Note the structure is >> not a tree, since multiple roots exist and as it may be cyclic. >> >> > > I understand that it is not a tree and that in case of sharing and > aliasing, multiple roots will exist. But, how can it be cyclic ? (Are you > not considering directionality or is it because the nodes in this > structure do have pointers to the parents or there is something else as > well ?) > A page-directory entry can point at the page directory (some OSes do this). -- I have a truly marvellous patch that fixes the bug which this signature is too narrow to contain.