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

[Sarosh Arif]

Hello,

On Thu, Sep 17, 2020 at 12:32 PM Dybkowski, AdamX
<adamx.dybkowski at intel.com> wrote:
>
> Hi.
>
> > -----Original Message-----
> > From: dev <dev-bounces at dpdk.org> On Behalf Of Sarosh Arif
> > Sent: Thursday, 17 September, 2020 08:53
> > To: dev at 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
>
I used this method to check and vt-d is enabled.
Is there anything else that I can do?
> 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
>