[ovs-dev] Cannot open /dev/vfio/noiommu-0: Permission denied

[Leon Goldberg]

On Fri, May 4, 2018 at 10:19 PM, Aaron Conole <aconole at redhat.com> wrote:

> Leon Goldberg <lgoldber at redhat.com> writes:
>
> > Hi list,
> >
> > I'm trying to integrate ovs-dpdk into oVirt. For testing purposes, I'm
> > writing a test that looks to run a VM on top of a dpdk port.
> >
> > The testing environment consists of nested virtualization:
> >
> > Physical machine -> Jenkins CI VM -> Target VM
> >
> > The test merely looks to see that the various components are properly
> > configured for the real world. For that purpose, I'm using NOIOMMU mode
> of
> > VFIO.
> >
> > The select virtio device fails to to be attached to dpdk, and I suspect
> it
> > is due to $subject.
> >
> > Here are the CI logs[1]. I see some other red lights, but $subject seems
> > the brightest.
>
> Can you provide:
>
> $ ps aux | grep ovs-vswitchd
> $ ls -lah /dev/vfio

Hey Aaron,

Here it is:

[root at lago-network-suite-master-host-0 ~]# ps aux | grep ovs-vswitchd
openvsw+   840  0.6  6.2 1273732 116716 ?      S<Lsl 07:28   0:10
ovs-vswitchd unix:/var/run/openvswitch/db.sock -vconsole:emer -vsyslog:err
-vfile:info --mlockall --user openvswitch:hugetlbfs --no-chdir
--log-file=/var/log/openvswitch/ovs-vswitchd.log
--pidfile=/var/run/openvswitch/ovs-vswitchd.pid --detach
root      4425  0.0  0.0 112660   976 pts/0    R+   07:55   0:00 grep
--color=auto ovs-vswitchd

[root at lago-network-suite-master-host-0 ~]# ls -lah /dev/vfio
total 0
drwxr-xr-x.  2 root root            80 May  6 07:28 .
drwxr-xr-x. 19 root root          3.2K May  6 07:28 ..
crw-rw----.  1 root hugetlbfs 244,   0 May  6 07:28 noiommu-0
crw-rw-rw-.  1 root root       10, 196 May  6 07:28 vfio

>
> Just want to see if there's a disconnect between the userid for ovs
> and the permissions on the vfio file.  If that's the case, we may need
> to update the vfio rules.
>
> > Any tips will be greatly appreciated!
> >
> > Thanks,
> > Leon
> >
> > [1]
> > http://jenkins.ovirt.org/job/ovirt-system-tests_standard-
> check-patch/642/artifact/exported-artifacts/check-
> patch.network_suite_master.el7.x86_64/tests.test_dpdk/
> lago-network-suite-master-host-0/_var_log/openvswitch/ovs-vswitchd.log
> > <http://jenkins.ovirt.org/job/ovirt-system-tests_standard-
> check-patch/642/artifact/exported-artifacts/check-
> patch.network_suite_master.el7.x86_64/tests.test_dpdk/
> lago-network-suite-master-host-0/_var_log/openvswitch/ovs-vswitchd.log>
> > _______________________________________________
> > dev mailing list
> > dev at openvswitch.org
> > https://mail.openvswitch.org/mailman/listinfo/ovs-dev
>