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@dpdk.org
Reporter: nandinipersad...@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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