[vfio-users] No IOMMU Groups seen in /sys/kernel/iommu_groups/

[Venumadhav Josyula]

Hi All,
We are trying to use vfio-pci. We have following
- intel_iommu=on in bios
- it shows in /proc/cmdline

[root at vflac2-kvm ~]# cat /proc/cmdline
BOOT_IMAGE=/vmlinuz-3.10.0-957.1.3.el7.x86_64 root=/dev/mapper/c7--kvm-root
ro crashkernel=auto rd.lvm.lv=c7-kvm/root rd.lvm.lv=c7-kvm/swap rhgb
quiet *intel_iommu=on
*isolcpus=2,3,6,7
[root at vflac2-kvm ~]# dmesg | grep IOM
*[    0.000000] DMAR: IOMMU enabled*
[root at vflac2-kvm ~]# uname -mrs
Linux 3.10.0-957.1.3.el7.x86_64 x86_64
[root at vflac2-kvm ~]# ls /sys/kernel/iommu_groups/

*[root at vflac2-kvm ~]# ls -al /sys/kernel/iommu_groups/total 0*



04:00.0 Ethernet controller: Intel Corporation Ethernet Controller
10-Gigabit X540-AT2 (rev 01)
04:00.1 Ethernet controller: Intel Corporation Ethernet Controller
10-Gigabit X540-AT2 (rev 01)
04:10.0 Ethernet controller: Intel Corporation X540 Ethernet Controller
Virtual Function (rev 01)
04:10.2 Ethernet controller: Intel Corporation X540 Ethernet Controller
Virtual Function (rev 01)
05:00.0 Ethernet controller: Intel Corporation Ethernet Controller X710 for
10GbE SFP+ (rev 02)
05:00.1 Ethernet controller: Intel Corporation Ethernet Controller X710 for
10GbE SFP+ (rev 02)

Can u suggest what could wrong ? We  are seeing no iommu_groups getting
created.

Thanks,
Regards,
Venu
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