From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received-SPF: None (no SPF record) identity=mailfrom; client-ip=180.169.121.91; helo=zxshcas1.zhaoxin.com; envelope-from=tigerliu@zhaoxin.com; receiver=edk2-devel@lists.01.org Received: from ZXSHCAS1.zhaoxin.com (unknown [180.169.121.91]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ml01.01.org (Postfix) with ESMTPS id 4459E2265A328 for ; Wed, 11 Apr 2018 19:40:35 -0700 (PDT) Received: from zxbjmbx2.zhaoxin.com (10.29.252.164) by ZXSHCAS1.zhaoxin.com (10.28.252.161) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.1261.35; Thu, 12 Apr 2018 10:40:31 +0800 Received: from zxbjmbx2.zhaoxin.com (10.29.252.164) by zxbjmbx2.zhaoxin.com (10.29.252.164) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.1261.35; Thu, 12 Apr 2018 10:40:29 +0800 Received: from zxbjmbx2.zhaoxin.com ([fe80::4d77:9dba:64a8:8ec3]) by zxbjmbx2.zhaoxin.com ([fe80::4d77:9dba:64a8:8ec3%4]) with mapi id 15.01.1261.035; Thu, 12 Apr 2018 10:40:29 +0800 From: "Tiger Liu(BJ-RD)" To: "'edk2-devel@lists.01.org'" Thread-Topic: [edk2] VT-d : VER_REG register question Thread-Index: AdPSBqKwcVHIsYg/TCq0NLTxlH/1jw== Date: Thu, 12 Apr 2018 02:40:29 +0000 Message-ID: <4977d7c207464e08973f9e6f4d051727@zhaoxin.com> Accept-Language: zh-CN, en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.29.8.22] MIME-Version: 1.0 X-Content-Filtered-By: Mailman/MimeDel 2.1.26 Subject: VT-d : VER_REG register question X-BeenThere: edk2-devel@lists.01.org X-Mailman-Version: 2.1.26 Precedence: list List-Id: EDK II Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 12 Apr 2018 02:40:36 -0000 Content-Language: zh-CN Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Hi, Jiewen: I have a question about VER_REG register's content. (VT-d spec) Does current Intel chipset support VT-d spec 2.4 ? It seems VER_REG always display 1.0 , why? Thanks Best wishes, ????? ????????????????????????????????????????????????????? CONFIDENTIAL NOTE: This email contains confidential or legally privileged information and is f= or the sole use of its intended recipient. Any unauthorized review, use, co= pying or forwarding of this email or the content of this email is strictly = prohibited.