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Thu, 12 Nov 2020 13:10:28 +0000 Date: Thu, 12 Nov 2020 09:10:26 -0400 From: Jason Gunthorpe To: "Raj, Ashok" CC: Thomas Gleixner , Christoph Hellwig , David Woodhouse , Dan Williams , "Tian, Kevin" , "Jiang, Dave" , Bjorn Helgaas , "vkoul@kernel.org" , "Dey, Megha" , "maz@kernel.org" , "bhelgaas@google.com" , "alex.williamson@redhat.com" , "Pan, Jacob jun" , "Liu, Yi L" , "Lu, Baolu" , "Kumar, Sanjay K" , "Luck, Tony" , "jing.lin@intel.com" , "kwankhede@nvidia.com" , "eric.auger@redhat.com" , "parav@mellanox.com" , "rafael@kernel.org" , "netanelg@mellanox.com" , "shahafs@mellanox.com" , "yan.y.zhao@linux.intel.com" , "pbonzini@redhat.com" , "Ortiz, Samuel" , "Hossain, Mona" , "dmaengine@vger.kernel.org" , "linux-kernel@vger.kernel.org" , "linux-pci@vger.kernel.org" , "kvm@vger.kernel.org" Subject: Re: [PATCH v4 06/17] PCI: add SIOV and IMS capability detection Message-ID: <20201112131026.GB2620339@nvidia.com> References: <20201106164850.GA85879@otc-nc-03> <20201106175131.GW2620339@nvidia.com> <20201107001207.GA2620339@nvidia.com> <87pn4nk7nn.fsf@nanos.tec.linutronix.de> <20201111154159.GA24059@infradead.org> <20201111160922.GA83266@otc-nc-03> <87k0uro7fz.fsf@nanos.tec.linutronix.de> <20201111230321.GC83266@otc-nc-03> Content-Type: text/plain; charset="us-ascii" Content-Disposition: inline In-Reply-To: <20201111230321.GC83266@otc-nc-03> X-ClientProxiedBy: MN2PR01CA0040.prod.exchangelabs.com (2603:10b6:208:23f::9) To DM6PR12MB3834.namprd12.prod.outlook.com (2603:10b6:5:14a::12) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from mlx.ziepe.ca (156.34.48.30) by MN2PR01CA0040.prod.exchangelabs.com (2603:10b6:208:23f::9) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3541.21 via Frontend Transport; Thu, 12 Nov 2020 13:10:27 +0000 Received: from jgg by mlx with local (Exim 4.94) (envelope-from ) id 1kdCMs-003fVN-EB; Thu, 12 Nov 2020 09:10:26 -0400 X-LD-Processed: 43083d15-7273-40c1-b7db-39efd9ccc17a,ExtAddr DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=nvidia.com; s=n1; t=1605186638; bh=JDzWZV5PMJTQTEmEpY/tlijlKuercM8A1+TCvshb8xI=; h=ARC-Seal:ARC-Message-Signature:ARC-Authentication-Results:Date: From:To:CC:Subject:Message-ID:References:Content-Type: Content-Disposition:In-Reply-To:X-ClientProxiedBy:MIME-Version: X-MS-Exchange-MessageSentRepresentingType:X-LD-Processed; b=ocIcSCQRr32Jb5ucGC891UICEaV/T3IYesXRfdM0vAyHRpcHgaAxyDGHg5S1G32cM lgvbLs2kGS0uv6okW4tjRGXHBoWtVeIcwd+T2DAO03rH6i5LewUI8b0Z4qbtnQ/GQK phzWm/0JMnegWAjkGUJPMfbz9QnmmpsbDJF0rTM5BhbbsoNWjh5arl53O/oIOQ+tGq e3QvooR7GwlfU645b+hxIklhgVcvr3JX8nRMaXszlUSFVrSYMqYegYcxeoZxsz5h4q TljFci5TVPRAuZrDPa0YPuRj3wQfiac3bT9qARgXfsF7WBN4iU3SS1gJ+8W6HRlIuL 6zDsO4rgcYW7g== Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org On Wed, Nov 11, 2020 at 03:03:21PM -0800, Raj, Ashok wrote: > By default the DVSEC is not presented to guest even when the full PF is > presented to guest. I believe VFIO only builds and presents known standard > capabilities and specific extended capabilities. I'm a bit weak but maybe > @AlexWilliamson can confirm if I'm off track. This also need to work on Hyper-V and all other cases, you can't just assume everything is vfio and kvm. It is horrible to ask people to go back an retroactively change their config space in a device just to work around all the design failings Thomas eloquantly describes :( Jason