From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from dpdk.org (dpdk.org [92.243.14.124]) by inbox.dpdk.org (Postfix) with ESMTP id B88CEA04BB; Thu, 17 Sep 2020 13:50:05 +0200 (CEST) Received: from [92.243.14.124] (localhost [127.0.0.1]) by dpdk.org (Postfix) with ESMTP id 9535F1D617; Thu, 17 Sep 2020 13:50:05 +0200 (CEST) Received: from mga05.intel.com (mga05.intel.com [192.55.52.43]) by dpdk.org (Postfix) with ESMTP id F3532E07 for ; Thu, 17 Sep 2020 13:50:03 +0200 (CEST) IronPort-SDR: 1+KoPrYsxhXzR6hXdSPV+DukWf9hG4wyXe6ihOwrjlts5kYqz8nfpqgzFC5UB6PHShEjbniiZX gbD/bGS8myBQ== X-IronPort-AV: E=McAfee;i="6000,8403,9746"; a="244514087" X-IronPort-AV: E=Sophos;i="5.76,436,1592895600"; d="scan'208";a="244514087" X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga005.jf.intel.com ([10.7.209.41]) by fmsmga105.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 17 Sep 2020 04:50:02 -0700 IronPort-SDR: U9M0oXyZ77RAShYvXXMIWIo4/mwH+nZ7a8A+a7LfMrVCGCd2YY1G2MOvYoIE1G4V92OVQVtcCM 8BzeLtwthE8A== X-IronPort-AV: E=Sophos;i="5.76,436,1592895600"; d="scan'208";a="483716213" Received: from aburakov-mobl.ger.corp.intel.com (HELO [10.213.206.43]) ([10.213.206.43]) by orsmga005-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 17 Sep 2020 04:50:01 -0700 To: Bruce Richardson , Sarosh Arif Cc: dev@dpdk.org References: <20200917091723.GD1568@bricha3-MOBL.ger.corp.intel.com> <20200917102204.GE1568@bricha3-MOBL.ger.corp.intel.com> From: "Burakov, Anatoly" Message-ID: <8fa1aae5-617c-64a7-a647-fd2508e0f662@intel.com> Date: Thu, 17 Sep 2020 12:49:59 +0100 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:68.0) Gecko/20100101 Thunderbird/68.12.0 MIME-Version: 1.0 In-Reply-To: <20200917102204.GE1568@bricha3-MOBL.ger.corp.intel.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit Subject: Re: [dpdk-dev] unable to bind to vfio-pci 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" On 17-Sep-20 11:22 AM, Bruce Richardson wrote: > On Thu, Sep 17, 2020 at 02:21:27PM +0500, Sarosh Arif wrote: >> On Thu, Sep 17, 2020 at 2:17 PM Bruce Richardson >> wrote: >>> >>> On Thu, Sep 17, 2020 at 11:52:58AM +0500, Sarosh Arif wrote: >>>> I have been trying to bind to vfio-pci using usertools/dpdk-devbind.py >>>> but am unable to do so. The reason behind this is that I am unable to >>>> write in /sys/bus/pci/drivers/vfio-pci/bind. Upon searching solutions >>>> I tried a couple of things such as setting iommu=pt and intel_iommu=on >>>> and ensured vt-d is enabled. >>>> Along with this I have made sure that the vfio-pci module is correctly >>>> loaded. I have also tried >>>> >>>> chmod 666 /sys/bus/pci/drivers/vfio-pci/bind >>>> >>>> So that I have permissions to write in this file. >>>> >>>> The error I get when I use usertools/dpdk-devbind.py to bind is this: >>>> Error: bind failed for 0000:b7:00.1 - Cannot bind to driver vfio-pci >>>> >>>> The details of 0000:b7:00.1 are as follows: >>>> Ethernet Connection X722 for 10GBASE-T 37d2' if=eno6 drv=i40e >>>> >>>> I have also unbinded The pci bridge to which 0000:b7:00.1 was connected. >>>> >>>> What more can be done to resolve this? >>>> >>> Since you describe changing permissions on the "bind" file, are you trying >>> to run dpdk-devbind.py as a non-root user? Does it work as root? >> I am running it as a root user. It does not work as a root user. > > One possible problem that it could be, is that you will need to ensure that > any other ports on the same device are either similarly bound to vfio-pci > or not bound to any driver. You can't have e.g. a 2-port X722 NIC where one > port is bound to the kernel driver, while another is bound to vfio in > userspace. > I don't think this would result in a bind error; rather, you'd see the IOMMU group as non-viable when attempting to use it with VFIO, but the binding itself should succeed. -- Thanks, Anatoly