From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jason Gunthorpe Subject: Re: [PATCH] rdma: don't make pages writeable if not requiested Date: Thu, 21 Mar 2013 11:21:50 -0600 Message-ID: <20130321172150.GA3118@obsidianresearch.com> References: <20130321061838.GA28319@redhat.com> <20130321070357.GD28328@redhat.com> <20130321085107.GE28328@redhat.com> <20130321093946.GG28328@redhat.com> <20130321171115.GA653@obsidianresearch.com> <20130321171525.GE2994@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: <20130321171525.GE2994-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org> Sender: linux-rdma-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: "Michael S. Tsirkin" Cc: Roland Dreier , "Michael R. Hines" , Sean Hefty , Hal Rosenstock , Yishai Hadas , Christoph Lameter , "linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org" , LKML , qemu-devel-qX2TKyscuCcdnm+yROfE0A@public.gmane.org List-Id: linux-rdma@vger.kernel.org On Thu, Mar 21, 2013 at 07:15:25PM +0200, Michael S. Tsirkin wrote: > No because application does this: > init page > > ... > > after a lot of time > > .. > > register > send > unregister > > so it can not be read only. mprotect(READONLY) register send unregister mprotect(WRITABLE) ? With something like GIFT the app already has to give up writing to the pages while they are moving, so changing the protection seems in line with that? Jason -- To unsubscribe from this list: send the line "unsubscribe linux-rdma" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751427Ab3CURWH (ORCPT ); Thu, 21 Mar 2013 13:22:07 -0400 Received: from quartz.orcorp.ca ([184.70.90.242]:34887 "EHLO quartz.orcorp.ca" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750916Ab3CURWE (ORCPT ); Thu, 21 Mar 2013 13:22:04 -0400 Date: Thu, 21 Mar 2013 11:21:50 -0600 From: Jason Gunthorpe To: "Michael S. Tsirkin" Cc: Roland Dreier , "Michael R. Hines" , Sean Hefty , Hal Rosenstock , Yishai Hadas , Christoph Lameter , "linux-rdma@vger.kernel.org" , LKML , qemu-devel@nongnu.org Subject: Re: [PATCH] rdma: don't make pages writeable if not requiested Message-ID: <20130321172150.GA3118@obsidianresearch.com> References: <20130321061838.GA28319@redhat.com> <20130321070357.GD28328@redhat.com> <20130321085107.GE28328@redhat.com> <20130321093946.GG28328@redhat.com> <20130321171115.GA653@obsidianresearch.com> <20130321171525.GE2994@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20130321171525.GE2994@redhat.com> User-Agent: Mutt/1.5.21 (2010-09-15) X-Broken-Reverse-DNS: no host name found for IP address 10.0.0.162 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Mar 21, 2013 at 07:15:25PM +0200, Michael S. Tsirkin wrote: > No because application does this: > init page > > ... > > after a lot of time > > .. > > register > send > unregister > > so it can not be read only. mprotect(READONLY) register send unregister mprotect(WRITABLE) ? With something like GIFT the app already has to give up writing to the pages while they are moving, so changing the protection seems in line with that? Jason From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([208.118.235.92]:39801) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1UIjBr-0005Ug-1f for qemu-devel@nongnu.org; Thu, 21 Mar 2013 13:22:14 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1UIjBm-0002O7-SQ for qemu-devel@nongnu.org; Thu, 21 Mar 2013 13:22:10 -0400 Received: from quartz.orcorp.ca ([184.70.90.242]:44971) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1UIjBm-0002Mu-Iv for qemu-devel@nongnu.org; Thu, 21 Mar 2013 13:22:06 -0400 Date: Thu, 21 Mar 2013 11:21:50 -0600 From: Jason Gunthorpe Message-ID: <20130321172150.GA3118@obsidianresearch.com> References: <20130321061838.GA28319@redhat.com> <20130321070357.GD28328@redhat.com> <20130321085107.GE28328@redhat.com> <20130321093946.GG28328@redhat.com> <20130321171115.GA653@obsidianresearch.com> <20130321171525.GE2994@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20130321171525.GE2994@redhat.com> Subject: Re: [Qemu-devel] [PATCH] rdma: don't make pages writeable if not requiested List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: "Michael S. Tsirkin" Cc: Roland Dreier , qemu-devel@nongnu.org, "linux-rdma@vger.kernel.org" , Yishai Hadas , LKML , "Michael R. Hines" , Hal Rosenstock , Sean Hefty , Christoph Lameter On Thu, Mar 21, 2013 at 07:15:25PM +0200, Michael S. Tsirkin wrote: > No because application does this: > init page > > ... > > after a lot of time > > .. > > register > send > unregister > > so it can not be read only. mprotect(READONLY) register send unregister mprotect(WRITABLE) ? With something like GIFT the app already has to give up writing to the pages while they are moving, so changing the protection seems in line with that? Jason