[dpdk-dev] unable to bind to vfio-pci

Bruce Richardson bruce.richardson at intel.com
Thu Sep 17 12:22:04 CEST 2020


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 at 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.


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