From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from d12nrmr1607.megacenter.de.ibm.com (d12nrmr1607.megacenter.de.ibm.com [9.149.167.49]) by mtagate4.de.ibm.com (8.13.8/8.13.8) with ESMTP id l5U2HaeF061312 for ; Sat, 30 Jun 2007 02:17:36 GMT Received: from d12av02.megacenter.de.ibm.com (d12av02.megacenter.de.ibm.com [9.149.165.228]) by d12nrmr1607.megacenter.de.ibm.com (8.13.8/8.13.8/NCO v8.3) with ESMTP id l5U2Ha1J2052190 for ; Sat, 30 Jun 2007 04:17:36 +0200 Received: from d12av02.megacenter.de.ibm.com (loopback [127.0.0.1]) by d12av02.megacenter.de.ibm.com (8.12.11.20060308/8.13.3) with ESMTP id l5U2HaKK003420 for ; Sat, 30 Jun 2007 04:17:36 +0200 Message-ID: <4685D9C9.20504@de.ibm.com> Date: Sat, 30 Jun 2007 06:19:21 +0200 From: Carsten Otte Reply-To: carsteno@de.ibm.com MIME-Version: 1.0 Subject: Re: RFC: multiple address spaces for one process References: <87myynt1m6.wl%peter@chubb.wattle.id.au> <468517E1.4050803@goop.org> In-Reply-To: <468517E1.4050803@goop.org> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org Return-Path: To: Jeremy Fitzhardinge Cc: Peter Chubb , virtualization@lists.linux-foundation.org, linux-mm@kvack.org, avi Kivity List-ID: Jeremy Fitzhardinge wrote: > It might be interesting if the two cases could be unified in some way, > so that the VMMs could use a common usermode mechanism to achieve the > same end, which is what Carsten was proposing. But its not obvious to > me how much common mechanism can be pulled out, since its a pretty > deeply architecture-specific operation. The big difference here is that LinuxOnLinux does represent guest virtual addressing in these mm structs where all other kernel based VMMs do represent guest physical in the user address space. That somewhat disqualifies LinuxOnLinux to share the commonality. Whether or not proposed patch makes sense for shaddow page tables is unknown to me, since we have nested paging on s390. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org