From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-3.9 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 1AB46ECE58F for ; Tue, 15 Oct 2019 13:15:35 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id D7FD621848 for ; Tue, 15 Oct 2019 13:15:34 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=microsoft.com header.i=@microsoft.com header.b="KFxhxdFc" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730687AbfJONPe (ORCPT ); Tue, 15 Oct 2019 09:15:34 -0400 Received: from mail-eopbgr730116.outbound.protection.outlook.com ([40.107.73.116]:8298 "EHLO NAM05-DM3-obe.outbound.protection.outlook.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1729551AbfJONPe (ORCPT ); Tue, 15 Oct 2019 09:15:34 -0400 ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=Y3+RN66aLjdbSpPZ77jqUFh5JcgES0kFoL+z9KNLfVeFjwsFxvA2BFN37GXbBePybu/dAYEYpwYO1R94Is99Vzg0wu3eWkgvMLEJx10DGznKupOIE5oNGrIkPiIgo2Eva8HqtRdzi7+QtjQZvMQ/cBcc0OS5qsHdbgShAyRyTtQNVKYtfM9Fa81JMtn309AQfR0G4bqIVJsRq5XYeLw4UxOIXoadba3bJToyLR+izz0wbXumjNg/+NHMsPKs3zwroYAaCiA+EMWFU2DcqeNonNHMOSgvE9e8rCYAthhYkmoATIxAmmGS9eZ94uV+bysYIeWE99/mNZFFMwJkir8smQ== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector9901; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=0q9oSQ9mKdD7JK1RBjH5CRcUw88eXkNwR+5yxXns5X0=; b=P1hFEk+93m5f4PPRX1cEpwh7PdOeJk7Hd9eDDXsZSo4Z+ocWE8so1QScgw+2Qel+77t5Tps7zPdip0jRBBUm6JfCEdSNiZDQvtKks3OWs8UUCp4z2ovmjyjmsHFiPCP0nrgkax0A3NBAJsp863hL9Yg8CPkiDQtJMiZ6iyuE+G53gosANxt560ToPKXwymKjKwxMHE0LANg2bXqtRg71pfI+aEEtVH95vU74+1XWWK21jvCuDfvODV6SQPlCEZhTxz1kijuNp5CSF9fyULbrV6rmL53l7Mq9dnGh6VYw4E23haA5JqjxCMzeS3paEMRpqpp+swPco/MV6qm5Rc9Eeg== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=microsoft.com; dmarc=pass action=none header.from=microsoft.com; dkim=pass header.d=microsoft.com; arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=selector2; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=0q9oSQ9mKdD7JK1RBjH5CRcUw88eXkNwR+5yxXns5X0=; b=KFxhxdFcJO79ghq1doD12JerOg8FXeCBXOhhIQCCIP2nNR66FGnkHq8dvKegRXO3XDZoDOnipOBoZV2RU3PkW3ovJ98BFXgZ9DCTn9WSxCN+nf9CucIBHvjWW8A42gVDmBwsQ0Z0u+Evyc9dQm6ejQdm3h8/puYo1PY1zEudJU4= Received: from DM5PR21MB0137.namprd21.prod.outlook.com (10.173.173.12) by DM5PR21MB0745.namprd21.prod.outlook.com (10.173.172.11) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.2347.11; Tue, 15 Oct 2019 13:15:32 +0000 Received: from DM5PR21MB0137.namprd21.prod.outlook.com ([fe80::a50f:aa3c:c7d6:f05e]) by DM5PR21MB0137.namprd21.prod.outlook.com ([fe80::a50f:aa3c:c7d6:f05e%11]) with mapi id 15.20.2347.023; Tue, 15 Oct 2019 13:15:32 +0000 From: Michael Kelley To: Andrea Parri , "linux-kernel@vger.kernel.org" , "linux-hyperv@vger.kernel.org" CC: KY Srinivasan , Haiyang Zhang , Stephen Hemminger , Sasha Levin , vkuznets , Dexuan Cui , Wei Liu Subject: RE: [PATCH v3 3/3] Drivers: hv: vmbus: Add module parameter to cap the VMBus version Thread-Topic: [PATCH v3 3/3] Drivers: hv: vmbus: Add module parameter to cap the VMBus version Thread-Index: AQHVg05RRjxab/oj70GFm8EYihbfkadbrdtw Date: Tue, 15 Oct 2019 13:15:32 +0000 Message-ID: References: <20191015114646.15354-1-parri.andrea@gmail.com> <20191015114646.15354-4-parri.andrea@gmail.com> In-Reply-To: <20191015114646.15354-4-parri.andrea@gmail.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: msip_labels: MSIP_Label_f42aa342-8706-4288-bd11-ebb85995028c_Enabled=True; MSIP_Label_f42aa342-8706-4288-bd11-ebb85995028c_SiteId=72f988bf-86f1-41af-91ab-2d7cd011db47; MSIP_Label_f42aa342-8706-4288-bd11-ebb85995028c_Owner=mikelley@ntdev.microsoft.com; MSIP_Label_f42aa342-8706-4288-bd11-ebb85995028c_SetDate=2019-10-15T13:15:30.3848646Z; MSIP_Label_f42aa342-8706-4288-bd11-ebb85995028c_Name=General; MSIP_Label_f42aa342-8706-4288-bd11-ebb85995028c_Application=Microsoft Azure Information Protection; MSIP_Label_f42aa342-8706-4288-bd11-ebb85995028c_ActionId=9ba475e1-64fd-4334-bb09-77238936d2a6; MSIP_Label_f42aa342-8706-4288-bd11-ebb85995028c_Extended_MSFT_Method=Automatic authentication-results: spf=none (sender IP is ) smtp.mailfrom=mikelley@microsoft.com; x-originating-ip: [24.22.167.197] x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: 9ee2c6c4-a5f3-4370-22de-08d75171c205 x-ms-office365-filtering-ht: Tenant x-ms-traffictypediagnostic: DM5PR21MB0745:|DM5PR21MB0745:|DM5PR21MB0745: x-ms-exchange-transport-forked: True x-ld-processed: 72f988bf-86f1-41af-91ab-2d7cd011db47,ExtAddr x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:813; x-forefront-prvs: 01917B1794 x-forefront-antispam-report: SFV:NSPM;SFS:(10019020)(4636009)(366004)(396003)(376002)(346002)(39860400002)(136003)(199004)(189003)(55016002)(52536014)(8936002)(6506007)(2906002)(229853002)(11346002)(5660300002)(446003)(4744005)(2201001)(81166006)(81156014)(305945005)(6246003)(86362001)(7736002)(66066001)(186003)(74316002)(26005)(71190400001)(71200400001)(4326008)(6116002)(8676002)(6436002)(3846002)(102836004)(316002)(10090500001)(256004)(9686003)(2501003)(33656002)(22452003)(10290500003)(478600001)(110136005)(54906003)(76116006)(66946007)(25786009)(486006)(66446008)(64756008)(66556008)(66476007)(476003)(7696005)(99286004)(76176011)(14454004)(8990500004);DIR:OUT;SFP:1102;SCL:1;SRVR:DM5PR21MB0745;H:DM5PR21MB0137.namprd21.prod.outlook.com;FPR:;SPF:None;LANG:en;PTR:InfoNoRecords;A:1;MX:1; received-spf: None (protection.outlook.com: microsoft.com does not designate permitted sender hosts) x-ms-exchange-senderadcheck: 1 x-microsoft-antispam: BCL:0; x-microsoft-antispam-message-info: Xmugq4WkcaUOB+4U4fGtd1je8iSFmsVj6X8gr2je+wFgxwk9XJ6EqgOKyhWm1OxEbo/Sfnrb04Nuq1zyp2RXV7ChxsAXSbjFu9nhveZGyLgYzDuFp7fI4lE94UAA+uyerUA6mNKzxWPBGQu0aH6btylMILgPsbsUqpOS3h3h9QiTjqV/fT5ivJYBZE+uH2WFz6d//jQU4OHOkcUE3hLDSHAvdK3ZLjF7PEpeBbOGnqbhVKZedEdEa+927DkVXerygTZ4PmssWfHv5PKvTEybdunHBd6opEWm/qAVSR484FtyXVZFXXZCZk9FjgRm6Zi5rK+FC6OmBw/cgMgOQwHrcJPUR7G2SCZy3/4pUmX8b2ZuGrma5r5VMVv1Y5s1d9e0u0c8E0VEeU+ucXzChlejUJNG7FvbKRSdrekK39RW3dg= Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: microsoft.com X-MS-Exchange-CrossTenant-Network-Message-Id: 9ee2c6c4-a5f3-4370-22de-08d75171c205 X-MS-Exchange-CrossTenant-originalarrivaltime: 15 Oct 2019 13:15:32.3965 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 72f988bf-86f1-41af-91ab-2d7cd011db47 X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: ykhgr2nvum5PPAXH7P6qTTYbtwxbNn42E5/djfTYpScsS/Z6jGwnQIj4LRG2SD0IMhZVdiEnSOhQzgz8LFD58yMje7FGgTXpKh4QZnXV2Vo= X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM5PR21MB0745 Sender: linux-hyperv-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-hyperv@vger.kernel.org From: Andrea Parri Sent: Tuesday, October 15, 2019= 4:47 AM >=20 > Currently, Linux guests negotiate the VMBus version with Hyper-V > and use the highest available VMBus version they can connect to. > This has some drawbacks: by using the highest available version, > certain code paths are never executed and can not be tested when > the guest runs on the newest host. >=20 > Add the module parameter "max_version", to upper-bound the VMBus > versions guests can negotiate. >=20 > Suggested-by: Dexuan Cui > Signed-off-by: Andrea Parri > --- > drivers/hv/connection.c | 13 +++++++++++++ > 1 file changed, 13 insertions(+) >=20 Reviewed-by: Michael Kelley