[DPDK/testpmd Bug 1651] Linux kernel 4.10.0 iommu attribute read error

[bugzilla at dpdk.org]

https://bugs.dpdk.org/show_bug.cgi?id=1651

            Bug ID: 1651
           Summary: Linux kernel 4.10.0 iommu attribute read error
           Product: DPDK
           Version: unspecified
          Hardware: All
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: testpmd
          Assignee: dev at dpdk.org
          Reporter: nandinipersad361 at gmail.com
  Target Milestone: ---

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.

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