From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:52622) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1dHtcj-0003XL-8c for qemu-devel@nongnu.org; Mon, 05 Jun 2017 11:08:54 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1dHtce-0002Ib-6w for qemu-devel@nongnu.org; Mon, 05 Jun 2017 11:08:53 -0400 Received: from mx1.redhat.com ([209.132.183.28]:59962) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1dHtce-0002Hp-0h for qemu-devel@nongnu.org; Mon, 05 Jun 2017 11:08:48 -0400 Date: Mon, 5 Jun 2017 18:08:39 +0300 From: "Michael S. Tsirkin" Message-ID: <20170605180805-mutt-send-email-mst@kernel.org> References: <20170526142858.19931-1-maxime.coquelin@redhat.com> <20170530211819-mutt-send-email-mst@kernel.org> <7d4af4dd-270b-605f-9535-7bf8323e74c2@redhat.com> <20170601165540-mutt-send-email-mst@kernel.org> <04975954-9972-d900-0a88-b0a2587766e1@redhat.com> <20170602180458-mutt-send-email-mst@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Subject: Re: [Qemu-devel] [PATCH v2 0/6] vhost-user: Specify and implement device IOTLB support List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Jason Wang Cc: yuanhan.liu@linux.intel.com, qemu-devel@nongnu.org, peterx@redhat.com, Maxime Coquelin , marcandre.lureau@gmail.com, wexu@redhat.com, vkaplans@redhat.com, jfreiman@redhat.com On Mon, Jun 05, 2017 at 04:51:55PM +0800, Jason Wang wrote: > > > > I think that if we could get rid of both accesses, it would be > > nice. Would need a feature bit naturally and we'd need to > > support old kernels but at least it will be contained and > > well documented. > > > > Technically we can, but we still need a workaround for old kernels. So I'm > not sure it's worth to do. > > Thanks I see it as valuable for documentation purposes. -- MST