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[109.64.41.91]) by smtp.gmail.com with ESMTPSA id o20sm24303052wra.29.2020.06.08.06.29.03 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 08 Jun 2020 06:29:04 -0700 (PDT) Date: Mon, 8 Jun 2020 09:29:01 -0400 From: "Michael S. Tsirkin" To: Jason Wang Cc: kvm@vger.kernel.org, virtualization@lists.linux-foundation.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, rob.miller@broadcom.com, lingshan.zhu@intel.com, eperezma@redhat.com, lulu@redhat.com, shahafs@mellanox.com, hanand@xilinx.com, mhabets@solarflare.com, gdawar@xilinx.com, saugatm@xilinx.com, vmireyno@marvell.com, zhangweining@ruijie.com.cn, eli@mellanox.com Subject: Re: [PATCH 5/6] vdpa: introduce virtio pci driver Message-ID: <20200608092530-mutt-send-email-mst@kernel.org> References: <20200607095012-mutt-send-email-mst@kernel.org> <9b1abd2b-232c-aa0f-d8bb-03e65fd47de2@redhat.com> <20200608021438-mutt-send-email-mst@kernel.org> <20200608052041-mutt-send-email-mst@kernel.org> <9d2571b6-0b95-53b3-6989-b4d801eeb623@redhat.com> <20200608054453-mutt-send-email-mst@kernel.org> <20200608055331-mutt-send-email-mst@kernel.org> <61117e6a-2568-d0f4-8713-d831af32814d@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <61117e6a-2568-d0f4-8713-d831af32814d@redhat.com> Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org On Mon, Jun 08, 2020 at 06:07:36PM +0800, Jason Wang wrote: > > On 2020/6/8 下午5:54, Michael S. Tsirkin wrote: > > On Mon, Jun 08, 2020 at 05:46:52PM +0800, Jason Wang wrote: > > > On 2020/6/8 下午5:45, Michael S. Tsirkin wrote: > > > > On Mon, Jun 08, 2020 at 05:43:58PM +0800, Jason Wang wrote: > > > > > > > Looking at > > > > > > > pci_match_one_device() it checks both subvendor and subdevice there. > > > > > > > > > > > > > > Thanks > > > > > > But IIUC there is no guarantee that driver with a specific subvendor > > > > > > matches in presence of a generic one. > > > > > > So either IFC or virtio pci can win, whichever binds first. > > > > > I'm not sure I get there. But I try manually bind IFCVF to qemu's > > > > > virtio-net-pci, and it fails. > > > > > > > > > > Thanks > > > > Right but the reverse can happen: virtio-net can bind to IFCVF first. > > > > > > That's kind of expected. The PF is expected to be bound to virtio-pci to > > > create VF via sysfs. > > > > > > Thanks > > > > > > > > > > > Once VFs are created, don't we want IFCVF to bind rather than > > virtio-pci? > > > Yes, but for PF we need virtio-pci. > > Thanks > (Ab)using the driver_data field for this is an option. What do you think? -- MST