From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <yuanhan.liu@linux.intel.com>
Received: from mga04.intel.com (mga04.intel.com [192.55.52.120])
 by dpdk.org (Postfix) with ESMTP id 93A798E74
 for <dev@dpdk.org>; Thu, 14 Jan 2016 08:57:43 +0100 (CET)
Received: from fmsmga003.fm.intel.com ([10.253.24.29])
 by fmsmga104.fm.intel.com with ESMTP; 13 Jan 2016 23:57:43 -0800
X-ExtLoop1: 1
X-IronPort-AV: E=Sophos;i="5.22,293,1449561600"; d="scan'208";a="633222333"
Received: from yliu-dev.sh.intel.com (HELO yliu-dev) ([10.239.66.49])
 by FMSMGA003.fm.intel.com with ESMTP; 13 Jan 2016 23:57:41 -0800
Date: Thu, 14 Jan 2016 15:58:59 +0800
From: Yuanhan Liu <yuanhan.liu@linux.intel.com>
To: "Xie, Huawei" <huawei.xie@intel.com>
Message-ID: <20160114075859.GN19531@yliu-dev.sh.intel.com>
References: <1449719650-3482-1-git-send-email-yuanhan.liu@linux.intel.com>
 <1452581944-24838-1-git-send-email-yuanhan.liu@linux.intel.com>
 <1452581944-24838-8-git-send-email-yuanhan.liu@linux.intel.com>
 <C37D651A908B024F974696C65296B57B4C58E492@SHSMSX101.ccr.corp.intel.com>
 <20160114075040.GM19531@yliu-dev.sh.intel.com>
 <C37D651A908B024F974696C65296B57B4C58E56F@SHSMSX101.ccr.corp.intel.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <C37D651A908B024F974696C65296B57B4C58E56F@SHSMSX101.ccr.corp.intel.com>
User-Agent: Mutt/1.5.23 (2014-03-12)
Cc: "dev@dpdk.org" <dev@dpdk.org>, "Michael S. Tsirkin" <mst@redhat.com>
Subject: Re: [dpdk-dev] [PATCH v2 7/7] virtio: add 1.0 support
X-BeenThere: dev@dpdk.org
X-Mailman-Version: 2.1.15
Precedence: list
List-Id: patches and discussions about DPDK <dev.dpdk.org>
List-Unsubscribe: <http://dpdk.org/ml/options/dev>,
 <mailto:dev-request@dpdk.org?subject=unsubscribe>
List-Archive: <http://dpdk.org/ml/archives/dev/>
List-Post: <mailto:dev@dpdk.org>
List-Help: <mailto:dev-request@dpdk.org?subject=help>
List-Subscribe: <http://dpdk.org/ml/listinfo/dev>,
 <mailto:dev-request@dpdk.org?subject=subscribe>
X-List-Received-Date: Thu, 14 Jan 2016 07:57:44 -0000

On Thu, Jan 14, 2016 at 07:51:08AM +0000, Xie, Huawei wrote:
> On 1/14/2016 3:49 PM, Yuanhan Liu wrote:
> > On Thu, Jan 14, 2016 at 07:47:17AM +0000, Xie, Huawei wrote:
> >> On 1/12/2016 2:58 PM, Yuanhan Liu wrote:
> >>> Modern (v1.0) virtio pci device defines several pci capabilities.
> >> [snip]
> >>> +static void
> >>> +modern_notify_queue(struct virtio_hw *hw __rte_unused, struct virtqueue *vq)
> >>> +{
> >>> +	modern_write16(1, vq->notify_addr);
> >>> +}
> >> Does virtio 1.0 only supports MMIO? MMIO has long VMEXIT latency than
> >> PORT IO.
> > Virtio 1.0 supports three transport layer, including MMIO and PCI. And
> > we use PCI only in our pmd driver.
> 
> I don't mean that MMIO but use memory mapped IO for configuration.

Then, yes.

	--yliu