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b=Ne3gMKsgaCgGFDZTKOrZVOj/JN8VALlNM8jbr4EquU3NNXjVLCMv3CmVcf5wn/5yG0QNv2sJwAhwukaGnJSoVRRHoFODOQdn+AxrHK826w0/uBUxPdxfijcwc/odOtcLLbSXJ4nhNYQrA+OZoI5ydj7LfnlNmrduWEoSz/356DY= Received: from BY5PR21MB1506.namprd21.prod.outlook.com (2603:10b6:a03:23d::12) by BYAPR21MB1144.namprd21.prod.outlook.com (2603:10b6:a03:102::13) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4628.4; Mon, 11 Oct 2021 17:46:48 +0000 Received: from BY5PR21MB1506.namprd21.prod.outlook.com ([fe80::6472:67ea:9a66:38a4]) by BY5PR21MB1506.namprd21.prod.outlook.com ([fe80::6472:67ea:9a66:38a4%3]) with mapi id 15.20.4628.005; Mon, 11 Oct 2021 17:46:48 +0000 From: Long Li To: vkuznets , Greg Kroah-Hartman CC: Bart Van Assche , "longli@linuxonhyperv.com" , "linux-block@vger.kernel.org" , "linux-kernel@vger.kernel.org" , "linux-hyperv@vger.kernel.org" , Jonathan Corbet , KY Srinivasan , Haiyang Zhang , Stephen Hemminger , Wei Liu , Dexuan Cui , Bjorn Andersson , Hans de Goede , "Williams, Dan J" , Maximilian Luz , Mike Rapoport , Ben Widawsky , Jiri Slaby , Andra Paraschiv , Siddharth Gupta , Hannes Reinecke Subject: RE: [Patch v5 0/3] Introduce a driver to support host accelerated access to Microsoft Azure Blob for Azure VM Thread-Topic: [Patch v5 0/3] Introduce a driver to support host accelerated access to Microsoft Azure Blob for Azure VM Thread-Index: AQHXiceSNIn8c8rqq0aMs/Uc2xnVEKtlJaUAgAARXqCAAAZzgIADIFJggAC3SwCAAv3hYIBE4/SggAyEiKCAAJ8QAIAKHh2wgADF34CAAFhQAIAFJJ+w Date: Mon, 11 Oct 2021 17:46:48 +0000 Message-ID: References: <87fstb3h6h.fsf@vitty.brq.redhat.com> In-Reply-To: <87fstb3h6h.fsf@vitty.brq.redhat.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_ActionId=a7fea1fb-92f3-4de5-8432-f4b2b33f3d72;MSIP_Label_f42aa342-8706-4288-bd11-ebb85995028c_ContentBits=0;MSIP_Label_f42aa342-8706-4288-bd11-ebb85995028c_Enabled=true;MSIP_Label_f42aa342-8706-4288-bd11-ebb85995028c_Method=Standard;MSIP_Label_f42aa342-8706-4288-bd11-ebb85995028c_Name=Internal;MSIP_Label_f42aa342-8706-4288-bd11-ebb85995028c_SetDate=2021-10-11T17:43:24Z;MSIP_Label_f42aa342-8706-4288-bd11-ebb85995028c_SiteId=72f988bf-86f1-41af-91ab-2d7cd011db47; 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charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: microsoft.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: BY5PR21MB1506.namprd21.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: 41d05e03-a123-45de-fdb0-08d98cdf19cd X-MS-Exchange-CrossTenant-originalarrivaltime: 11 Oct 2021 17:46:48.6807 (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: OGcy2BGTahoY+6ZxLOmQVD2RDGIcsMYAYtjt17CMn2h2K8Mt/uoBurnQyRSBtLlf3KlG8vFBj/vH5QHIFidqCw== X-MS-Exchange-Transport-CrossTenantHeadersStamped: BYAPR21MB1144 Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org > Subject: Re: [Patch v5 0/3] Introduce a driver to support host accelerate= d access > to Microsoft Azure Blob for Azure VM >=20 > Greg Kroah-Hartman writes: >=20 > ... > > > > Not to mention the whole crazy idea of "let's implement our REST api > > that used to go over a network connection over an ioctl instead!" > > That's the main problem that you need to push back on here. > > > > What is forcing you to put all of this into the kernel in the first > > place? What's wrong with the userspace network connection/protocol > > that you have today? > > > > Does this mean that we now have to implement all REST apis that people > > dream up as ioctl interfaces over a hyperv transport? That would be > > insane. >=20 > As far as I understand, the purpose of the driver is to replace a "slow" > network connection to API endpoint with a "fast" transport over Vmbus. So > what if instead of implementing this new driver we just use Hyper-V Vsock= and > move API endpoint to the host? Hi Vitaly, We looked at Hyper-V Vsock when designing this driver. The problem is that = the Hyper-V device model of Vsock can't support the data throughput and sca= le needed for Blobs. Vsock is mostly used for management tasks. The usage of Blob in Azure justifies an dedicated VMBUS channel (and sub-ch= annels) for a new VSP/VSC driver. Thanks, Long >=20 > -- > Vitaly