From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <huawei.xie@intel.com>
Received: from mga01.intel.com (mga01.intel.com [192.55.52.88])
 by dpdk.org (Postfix) with ESMTP id 4C2348E83
 for <dev@dpdk.org>; Thu, 14 Jan 2016 08:51:12 +0100 (CET)
Received: from fmsmga003.fm.intel.com ([10.253.24.29])
 by fmsmga101.fm.intel.com with ESMTP; 13 Jan 2016 23:51:11 -0800
X-ExtLoop1: 1
X-IronPort-AV: E=Sophos;i="5.22,293,1449561600"; d="scan'208";a="633220055"
Received: from fmsmsx105.amr.corp.intel.com ([10.18.124.203])
 by FMSMGA003.fm.intel.com with ESMTP; 13 Jan 2016 23:51:11 -0800
Received: from fmsmsx118.amr.corp.intel.com (10.18.116.18) by
 FMSMSX105.amr.corp.intel.com (10.18.124.203) with Microsoft SMTP Server (TLS)
 id 14.3.248.2; Wed, 13 Jan 2016 23:51:11 -0800
Received: from shsmsx104.ccr.corp.intel.com (10.239.4.70) by
 fmsmsx118.amr.corp.intel.com (10.18.116.18) with Microsoft SMTP Server (TLS)
 id 14.3.248.2; Wed, 13 Jan 2016 23:51:10 -0800
Received: from shsmsx101.ccr.corp.intel.com ([169.254.1.215]) by
 SHSMSX104.ccr.corp.intel.com ([169.254.5.117]) with mapi id 14.03.0248.002;
 Thu, 14 Jan 2016 15:51:09 +0800
From: "Xie, Huawei" <huawei.xie@intel.com>
To: Yuanhan Liu <yuanhan.liu@linux.intel.com>
Thread-Topic: [PATCH v2 7/7] virtio: add 1.0 support
Thread-Index: AdFOn8qVIMp9mFhvQbG10T5nROu3pg==
Date: Thu, 14 Jan 2016 07:51:08 +0000
Message-ID: <C37D651A908B024F974696C65296B57B4C58E56F@SHSMSX101.ccr.corp.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>
Accept-Language: en-US
Content-Language: en-US
X-MS-Has-Attach: 
X-MS-TNEF-Correlator: 
x-originating-ip: [10.239.4.80]
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: quoted-printable
MIME-Version: 1.0
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 07:51:12 -0000

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