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Diffstat (limited to 'doc/guides/rel_notes/known_issues.rst')
| -rw-r--r-- | doc/guides/rel_notes/known_issues.rst | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/doc/guides/rel_notes/known_issues.rst b/doc/guides/rel_notes/known_issues.rst index afcc2c44..716bd736 100644 --- a/doc/guides/rel_notes/known_issues.rst +++ b/doc/guides/rel_notes/known_issues.rst @@ -714,3 +714,28 @@ igb_uio can not be used when running l3fwd-power **Driver/Module**: ``igb_uio`` module. + + +Linux kernel 4.10.0 iommu attribute read error +---------------------------------------------- + +**Description**: + 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 commmit a7fdb6e648fb + <https://patchwork.kernel.org/patch/9595727/>`_, + This bug is introduced in `Linux commmit 39ab9555c241 + <https://patchwork.kernel.org/patch/9554403/>`_, + +**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. |