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Tsirkin" , "John G. Johnson" , Andra-Irina Paraschiv , Alexander Graf , "qemu-devel@nongnu.org" , "kvm@vger.kernel.org" , Maxime Coquelin , =?iso-8859-1?Q?Alex_Benn=E9e?= , Felipe Franciosi , Swapnil Ingle Subject: RE: Inter-VM device emulation (call on Mon 20th July 2020) Thread-Topic: Inter-VM device emulation (call on Mon 20th July 2020) Thread-Index: AQHWWpp0s37rL88/sEC6+WdVwr18HakI0k+g Date: Wed, 15 Jul 2020 16:20:37 +0000 Message-ID: References: <86d42090-f042-06a1-efba-d46d449df280@arrikto.com> <20200715112342.GD18817@stefanha-x1.localdomain> In-Reply-To: <20200715112342.GD18817@stefanha-x1.localdomain> Accept-Language: en-GB, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: authentication-results: redhat.com; dkim=none (message not signed) header.d=none;redhat.com; dmarc=none action=none header.from=nutanix.com; x-originating-ip: [92.29.225.29] x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: 94f593b2-c32f-4deb-f15b-08d828db027e x-ms-traffictypediagnostic: MWHPR0201MB3404: x-ms-exchange-transport-forked: True x-microsoft-antispam-prvs: x-proofpoint-crosstenant: true x-ms-oob-tlc-oobclassifiers: OLM:10000; x-ms-exchange-senderadcheck: 1 x-microsoft-antispam: BCL:0; x-microsoft-antispam-message-info: IOs2Pll/SFWysXFWtrN/+HLKicshYm21JYwpupoV+1/1VOxjq7sxVH/HDcHHeT+ffAwsb4ZTigf2mFwuYl8e+7MJXAieA9ls1quoqFY09roxeUEHmq0X13tsLEMiRupNmN5HjzuTWxIUi2blM7E75/hY4dSf70ykUstula3lA3RaV4AlKFvgfrvQbbxG+2p2pynLS4SBd13ACmFdIoRxS36rGkHor29W8EBqOR4towPM4oUAkpjrnAlxZdBCG6QSHFMkBr0FTj88+lyzVecEsrzqoTsQ/gPwFv6iT6EYTtvbeTxu5M7Sb9x8I04hXyoyWDAv8hsMC9f91RS9zCPnWPYt4CIAIKPK7ketJYKT8CYIlJGzxk02sDyvguT775xLtsm7muF5SMr6k6A8lyXAyg== x-forefront-antispam-report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:MW2PR02MB3723.namprd02.prod.outlook.com;PTR:;CAT:NONE;SFTY:;SFS:(4636009)(366004)(5660300002)(86362001)(33656002)(83380400001)(53546011)(54906003)(55016002)(6506007)(498600001)(9686003)(110136005)(7696005)(966005)(76116006)(66476007)(66556008)(71200400001)(66446008)(26005)(64756008)(66946007)(52536014)(8676002)(7416002)(107886003)(44832011)(4326008)(186003)(2906002)(8936002);DIR:OUT;SFP:1102; x-ms-exchange-antispam-messagedata: 6RMMPFeJEFy1E7jZQzCr/OGCLhjJYm8jLTyMcDYk5gddsem4aVOkY1EgybEOq95HH/2WG/59Bqtwt0YDs5EtinQw/jOBK4f7rOtMOdGf9H6XtSWbbo0vvv90jtlYPT/YM8PYjHlCIGkNsABSr9ZR8NHioXDrTctpvDjDa4ltOxaEQhQZVJg5k40N6xavoJCoeaDrmrrwuOydguLvpE3vy4e21sUNiGBalvm+HPitKq8n2hjmiffglZfmMJyVy2jJkf1Ib9W1kHXttcaukaj/R/B8IEE9eYl527gpjGvrUyzm81EHBPEo5wFbLZLX3vZrVCmu8C+jF+iTlb1HseR5jggdCMxhZ/EB0TyxvUFg2KdhZVJtcZwlSrcFYhC7egUGPRI/fhFpMQSCrPT08IO7Zc8lAxO4JjQ9JhJVLgV9Hn5MxLhhCMxcY+GgNNyz05xQE+jLn0NjrXZ0jsSJDuuDTXOZkjItILf3Junmfc2gT7k= Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: nutanix.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: MW2PR02MB3723.namprd02.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: 94f593b2-c32f-4deb-f15b-08d828db027e X-MS-Exchange-CrossTenant-originalarrivaltime: 15 Jul 2020 16:20:37.4929 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: bb047546-786f-4de1-bd75-24e5b6f79043 X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: 3SkyBBBiJwtDH/6IzPg/pyKE78sCooDYZPAbraUo3D8kZoUhTUn/RyspzoaoQG+gbFF3YCbAQtQTJhJJzhb7xrZlo3jv7uZmnEK4QEvYxW0= X-MS-Exchange-Transport-CrossTenantHeadersStamped: MWHPR0201MB3404 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.235,18.0.687 definitions=2020-07-15_12:2020-07-15,2020-07-15 signatures=0 X-Proofpoint-Spam-Reason: safe Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org > -----Original Message----- > From: kvm-owner@vger.kernel.org On > Behalf Of Stefan Hajnoczi > Sent: 15 July 2020 12:24 > To: Nikos Dragazis ; Jan Kiszka > > Cc: Michael S. Tsirkin ; Thanos Makatos > ; John G. Johnson > ; Andra-Irina Paraschiv > ; Alexander Graf ; qemu- > devel@nongnu.org; kvm@vger.kernel.org; Maxime Coquelin > ; Alex Benn=E9e > Subject: Inter-VM device emulation (call on Mon 20th July 2020) >=20 > Hi, > Several projects are underway to create an inter-VM device emulation > interface: >=20 > * ivshmem v2 > https://www.mail-archive.com/qemu-devel@nongnu.org/msg706465.html >=20 > A PCI device that provides shared-memory communication between VMs. > This device already exists but is limited in its current form. The > "v2" project updates IVSHMEM's capabilities and makes it suitable as > a VIRTIO transport. >=20 > Jan Kiszka is working on this and has posted specs for review. >=20 > * virtio-vhost-user > https://www.mail-archive.com/virtio-dev@lists.oasis- > open.org/msg06429.html >=20 > A VIRTIO device that transports the vhost-user protocol. Allows > vhost-user device emulation to be implemented by another VM. >=20 > Nikos Dragazis is working on this with QEMU, DPDK, and VIRTIO patches > posted. >=20 > * VFIO-over-socket > https://github.com/tmakatos/qemu/blob/master/docs/devel/vfio-over- > socket.rst >=20 > Similar to the vhost-user protocol in spirit but for any PCI device. > Uses the Linux VFIO ioctl API as the protocol instead of vhost. >=20 > It doesn't have a virtio-vhost-user equivalent yet, but the same > approach could be applied to VFIO-over-socket too. >=20 > Thanos Makatos and John G. Johnson are working on this. The draft > spec is available. >=20 > Let's have a call to figure out: >=20 > 1. What is unique about these approaches and how do they overlap? > 2. Can we focus development and code review efforts to get something > merged sooner? >=20 > Jan and Nikos: do you have time to join on Monday, 20th of July at 15:00 > UTC? > https://www.timeanddate.com/worldclock/fixedtime.html?iso=3D20200720T1 > 500 >=20 > Video call URL: https://bluejeans.com/240406010 >=20 > It would be nice if Thanos and/or JJ could join the call too. Others > welcome too (feel free to forward this email)! Sure! >=20 > Stefan 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=-8.8 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, MENTIONS_GIT_HOSTING,SPF_HELO_NONE,SPF_PASS autolearn=unavailable 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 65331C433DF for ; Wed, 15 Jul 2020 16:21:36 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 2EA3B2065E for ; Wed, 15 Jul 2020 16:21:36 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=nutanix.com header.i=@nutanix.com header.b="oMpXJrAG" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 2EA3B2065E Authentication-Results: mail.kernel.org; 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dmarc=pass action=none header.from=nutanix.com; dkim=pass header.d=nutanix.com; arc=none Received: from MW2PR02MB3723.namprd02.prod.outlook.com (2603:10b6:907:2::32) by MWHPR0201MB3404.namprd02.prod.outlook.com (2603:10b6:301:7d::30) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3174.20; Wed, 15 Jul 2020 16:20:37 +0000 Received: from MW2PR02MB3723.namprd02.prod.outlook.com ([fe80::41c0:3347:6d78:a869]) by MW2PR02MB3723.namprd02.prod.outlook.com ([fe80::41c0:3347:6d78:a869%5]) with mapi id 15.20.3174.025; Wed, 15 Jul 2020 16:20:37 +0000 From: Thanos Makatos To: Stefan Hajnoczi , Nikos Dragazis , Jan Kiszka Subject: RE: Inter-VM device emulation (call on Mon 20th July 2020) Thread-Topic: Inter-VM device emulation (call on Mon 20th July 2020) Thread-Index: AQHWWpp0s37rL88/sEC6+WdVwr18HakI0k+g Date: Wed, 15 Jul 2020 16:20:37 +0000 Message-ID: References: <86d42090-f042-06a1-efba-d46d449df280@arrikto.com> <20200715112342.GD18817@stefanha-x1.localdomain> In-Reply-To: <20200715112342.GD18817@stefanha-x1.localdomain> Accept-Language: en-GB, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: authentication-results: redhat.com; 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envelope-from=thanos.makatos@nutanix.com; helo=mx0b-002c1b01.pphosted.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/07/15 12:20:45 X-ACL-Warn: Detected OS = Linux 3.x [generic] X-Spam_score_int: -37 X-Spam_score: -3.8 X-Spam_bar: --- X-Spam_report: (-3.8 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-1, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: "John G. Johnson" , Swapnil Ingle , Andra-Irina Paraschiv , "kvm@vger.kernel.org" , "Michael S. Tsirkin" , "qemu-devel@nongnu.org" , Maxime Coquelin , Alexander Graf , Felipe Franciosi , =?iso-8859-1?Q?Alex_Benn=E9e?= Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" > -----Original Message----- > From: kvm-owner@vger.kernel.org On > Behalf Of Stefan Hajnoczi > Sent: 15 July 2020 12:24 > To: Nikos Dragazis ; Jan Kiszka > > Cc: Michael S. Tsirkin ; Thanos Makatos > ; John G. Johnson > ; Andra-Irina Paraschiv > ; Alexander Graf ; qemu- > devel@nongnu.org; kvm@vger.kernel.org; Maxime Coquelin > ; Alex Benn=E9e > Subject: Inter-VM device emulation (call on Mon 20th July 2020) >=20 > Hi, > Several projects are underway to create an inter-VM device emulation > interface: >=20 > * ivshmem v2 > https://www.mail-archive.com/qemu-devel@nongnu.org/msg706465.html >=20 > A PCI device that provides shared-memory communication between VMs. > This device already exists but is limited in its current form. The > "v2" project updates IVSHMEM's capabilities and makes it suitable as > a VIRTIO transport. >=20 > Jan Kiszka is working on this and has posted specs for review. >=20 > * virtio-vhost-user > https://www.mail-archive.com/virtio-dev@lists.oasis- > open.org/msg06429.html >=20 > A VIRTIO device that transports the vhost-user protocol. Allows > vhost-user device emulation to be implemented by another VM. >=20 > Nikos Dragazis is working on this with QEMU, DPDK, and VIRTIO patches > posted. >=20 > * VFIO-over-socket > https://github.com/tmakatos/qemu/blob/master/docs/devel/vfio-over- > socket.rst >=20 > Similar to the vhost-user protocol in spirit but for any PCI device. > Uses the Linux VFIO ioctl API as the protocol instead of vhost. >=20 > It doesn't have a virtio-vhost-user equivalent yet, but the same > approach could be applied to VFIO-over-socket too. >=20 > Thanos Makatos and John G. Johnson are working on this. The draft > spec is available. >=20 > Let's have a call to figure out: >=20 > 1. What is unique about these approaches and how do they overlap? > 2. Can we focus development and code review efforts to get something > merged sooner? >=20 > Jan and Nikos: do you have time to join on Monday, 20th of July at 15:00 > UTC? > https://www.timeanddate.com/worldclock/fixedtime.html?iso=3D20200720T1 > 500 >=20 > Video call URL: https://bluejeans.com/240406010 >=20 > It would be nice if Thanos and/or JJ could join the call too. Others > welcome too (feel free to forward this email)! Sure! >=20 > Stefan