From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from dpdk.org (dpdk.org [92.243.14.124]) by dpdk.space (Postfix) with ESMTP id B096BA0679 for ; Tue, 2 Apr 2019 12:38:57 +0200 (CEST) Received: from [92.243.14.124] (localhost [127.0.0.1]) by dpdk.org (Postfix) with ESMTP id 63AC8378B; Tue, 2 Apr 2019 12:38:56 +0200 (CEST) Received: from mail.oneaccess-net.com (mail2.belgium.oneaccess-net.com [91.183.184.101]) by dpdk.org (Postfix) with ESMTP id 5ACF93576 for ; Tue, 2 Apr 2019 12:38:55 +0200 (CEST) Received: from [10.0.21.136] (10.0.21.136) by mail.oneaccess-net.com (10.0.24.95) with Microsoft SMTP Server (TLS) id 14.3.435.0; Tue, 2 Apr 2019 12:38:54 +0200 To: , References: <20190312093826.GA914268@bricha3-MOBL.ger.corp.intel.com> <20190312102009.GA932176@bricha3-MOBL.ger.corp.intel.com> <38327cd0-7fa2-9172-5343-0cded8e51594@intel.com> From: John Sucaet Message-ID: <38a5d7ab-7449-fabb-46f7-6acf9d99680f@oneaccess-net.com> Date: Tue, 2 Apr 2019 12:38:54 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.9.1 MIME-Version: 1.0 In-Reply-To: <38327cd0-7fa2-9172-5343-0cded8e51594@intel.com> Content-Type: text/plain; charset="UTF-8"; format="flowed" Content-Transfer-Encoding: 8bit Content-Language: en-US Subject: Re: [dpdk-dev] Query : Does Binding with vfio-pci is supported inside qemu-kvm guest/vm instance.? X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org Sender: "dev" Message-ID: <20190402103854.zKzsxeg0RIi8IEd7tC_UrqydVvouEVdjb8ioWqcXupU@z> Hi Anatoly, As you said: There's no reason to use igb_uio, ever! I would like to ask whether vfio-pci with or without vIOMMU should/could work for virtio-pci net devices in the case of a 32-bit dpdk application, on a 64-bit kernel (4.9) inside a guest VM (qemu-2.10.2-1.fc27)? I tried both a 64-bit and a 32-bit version of the same application, but only in the case of the 64-bit application, the port was found by eal. The 32-bit application gave errors like: EAL: pci_map_resource(): cannot mmap(16, 0xf4a01000, 0x4000, 0x0): Invalid argument (0xffffffff) EAL: Failed to map pci BAR4 EAL:   0000:00:02.0 mapping BAR4 failed: Invalid argument EAL: Can't write to PCI bar (0) : offset (12) EAL: Can't read from PCI bar (0) : offset (12) EAL: Can't read from PCI bar (0) : offset (12) EAL: Can't write to PCI bar (0) : offset (12) EAL: Can't read from PCI bar (0) : offset (12) EAL: Can't write to PCI bar (0) : offset (12) EAL: Can't read from PCI bar (0) : offset (0) EAL: Can't write to PCI bar (0) : offset (4) EAL: Can't write to PCI bar (0) : offset (14) EAL: Can't read from PCI bar (0) : offset (14) EAL: Can't read from PCI bar (0) : offset (1a) EAL: Can't read from PCI bar (0) : offset (1c) EAL: Can't write to PCI bar (0) : offset (e) EAL: Can't read from PCI bar (0) : offset (c) virtio_init_queue(): virtqueue size is not powerof 2 EAL: Requested device 0000:00:02.0 cannot be used Maybe you have an idea what went wrong here? By preference, I would like to continue to use the 32-bit application which worked fine with the igb_uio driver. Thanks John On 03/12/2019 11:57 AM, Burakov, Anatoly wrote: > On 12-Mar-19 10:20 AM, Bruce Richardson wrote: >> On Tue, Mar 12, 2019 at 05:54:39PM +0800, Jason Wang wrote: >>> >>> On 2019/3/12 下午5:42, Thanneeru Srinivasulu wrote: >>>> Thanks Bruce.. >>>> >>>> On Tue, Mar 12, 2019 at 3:08 PM Bruce Richardson >>>> wrote: >>>>> On Tue, Mar 12, 2019 at 10:57:55AM +0530, Thanneeru Srinivasulu >>>>> wrote: >>>>>> Hi Everyone. >>>>>> >>>>>> I did attached pice  to Guest VM using vfio-pci with qemu >>>>>> command, and then >>>>>> tried binding the pcie bdf with vfio-pci, observing binding >>>>>> failure with >>>>>> vfio-pci. >>>>>> >>>>>> Where as when tryied with igb_uio, everything works fine. >>>>>> >>>>>> Does Binding with vfio-pci is supported inside VM/guest? >>>>>> >>>>> vfio support requires the presence of an IOMMU, and you generally >>>>> don't >>>>> have an IOMMU available in a VM. >>>>> >>>>> /Bruce >>> >>> >>> Actually, Qemu support vIOMMU + VFIO in guest[1], all you need is to >>> add a >>> intel IOMMU and enabling caching mode. >>> >>> Thanks >>> >>> >>> [1] >>> >>> https://www.lfasiallc.com/wp-content/uploads/2017/11/Device-Assignment-with-Nested-Guests-and-DPDK_Peter-Xu.pdf >>> >>> >> Thanks for the info. >> >> /Bruce >> > > One more thing: even without vIOMMU, VFIO has no-IOMMU mode which can > be enabled (for a recent-enough kernel). This will make VFIO work even > in cases where the guest doesn't have IOMMU emulation. See? There's no > reason to use igb_uio, ever! :D >