Hi. > -----Original Message----- > From: dev <dev-boun...@dpdk.org> On Behalf Of Sarosh Arif > Sent: Thursday, 17 September, 2020 08:53 > To: dev@dpdk.org > Subject: [dpdk-dev] unable to bind to vfio-pci > > 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.
[Adam] First thing: to check if VT-d is enabled in Linux, you can read MSR 0x3a register. Its lowest bit set will show VT-d works: (optionally on Ubuntu: apt-get install msr-tools) modprobe msr rdmsr 0x3a 3 or 5 -> OK Other possible way to check for VT-d (IOMMU) working is to view the booting log (dmesg): dmesg | grep DMAR "DMAR: IOMMU enabled" -> OK Both of these should be met in order to use vfio-pci in the next step. > 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? > > Regards, > Sarosh Arif Adam Dybkowski