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.richard...@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.