When VT-d is enabled (iommu=pt intel_iommu=on), reading IOMMU attributes from
/sys/devices/virtual/iommu/dmarXXX/intel-iommu/cap on Linux kernel 4.10.0
error. This bug is fixed in Linux commit a7fdb6e648fb, This bug is introduced
in Linux commit 39ab9555c241,

Implication:
When binding devices to VFIO and attempting to run testpmd application, testpmd
(and other DPDK applications) will not initialize.

Resolution/Workaround:
Use other linux kernel version. It only happens in linux kernel 4.10.0.

Affected Environment/Platform:
ALL OS of linux kernel 4.10.0.

Driver/Module:
vfio-pci module.