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From: "Burakov, Anatoly" <anatoly.burakov@intel.com>
To: Sarosh Arif <sarosh.arif@emumba.com>
Cc: Bruce Richardson <bruce.richardson@intel.com>, dev@dpdk.org
Subject: Re: [dpdk-dev] unable to bind to vfio-pci
Date: Mon, 21 Sep 2020 12:36:35 +0100
Message-ID: <46cecc05-81d3-2933-dc8f-6c6671e219f2@intel.com> (raw)
In-Reply-To: <CABoZmYNh0NOhepMpGdQNX34mQ1tpM_mfd4_B6nxZkNgLOxyrzQ@mail.gmail.com>

On 21-Sep-20 12:10 PM, Sarosh Arif wrote:
> On Thu, Sep 17, 2020 at 4:50 PM Burakov, Anatoly
> <anatoly.burakov@intel.com> wrote:
>> 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
>>>> <bruce.richardson@intel.com> 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 unbinded all other ports from the kernel driver yet I could not bind
> to vfio. The problem seems to be the inability to write in
> /sys/bus/pci/drivers/vfio-pci/bind and
> /sys/bus/pci/drivers/vfio-pci/new_id. When I manually try to echo in
> these files I get "Permission denied".

Does dmesg | tail indicate anything?

>> 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


      reply	other threads:[~2020-09-21 11:36 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-09-17  6:52 Sarosh Arif
2020-09-17  7:31 ` Dybkowski, AdamX
2020-09-17  8:39   ` Sarosh Arif
2020-09-17  9:17 ` Bruce Richardson
2020-09-17  9:21   ` Sarosh Arif
2020-09-17  9:35     ` Burakov, Anatoly
2020-09-21 11:54       ` Sarosh Arif
2020-09-21 11:58         ` Burakov, Anatoly
2020-09-17 10:22     ` Bruce Richardson
2020-09-17 11:49       ` Burakov, Anatoly
2020-09-21 11:10         ` Sarosh Arif
2020-09-21 11:36           ` Burakov, Anatoly [this message]

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