From mboxrd@z Thu Jan 1 00:00:00 1970 From: Stephen Hemminger Subject: Re: [PATCH v2] vhost: Add indirect descriptors support to the TX path Date: Sat, 24 Sep 2016 18:50:07 -0700 Message-ID: <20160924185007.19f21a7e@xeon-e3> References: <1474615009-26626-1-git-send-email-maxime.coquelin@redhat.com> <20160923112416.4f798b4b@xeon-e3> <20160923213055-mutt-send-email-mst@kernel.org> <20160923132805.3207f1fa@xeon-e3> <20160925035832-mutt-send-email-mst@kernel.org> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Cc: Maxime Coquelin , yuanhan.liu@linux.intel.com, huawei.xie@intel.com, dev@dpdk.org, vkaplans@redhat.com To: "Michael S. Tsirkin" Return-path: Received: from mail-pa0-f52.google.com (mail-pa0-f52.google.com [209.85.220.52]) by dpdk.org (Postfix) with ESMTP id D67342C40 for ; Sun, 25 Sep 2016 03:49:56 +0200 (CEST) Received: by mail-pa0-f52.google.com with SMTP id qn7so33962574pac.3 for ; Sat, 24 Sep 2016 18:49:56 -0700 (PDT) In-Reply-To: <20160925035832-mutt-send-email-mst@kernel.org> List-Id: patches and discussions about DPDK List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org Sender: "dev" On Sun, 25 Sep 2016 04:02:28 +0300 "Michael S. Tsirkin" wrote: > I see. It's implied by VERSION_1 in fact. > In other words if VERSION_1 is negotiated then bit 27 > isn't ANY_LAYOUT, it's in fact reserved. But what if guest isn't using Version 1? Legacy distro's certainly won't have it enabled.