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 Content-Length: 698 Lines: 35 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-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/