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doc: add Linux 4.10.0 known issue in release notes

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Linux kernel 4.10.0 IOMMU attribute read error.

Cc: stable@dpdk.org

Signed-off-by: Rosen Xu <rosen.xu@intel.com>
Acked-by: John McNamara <john.mcnamara@intel.com>
This commit is contained in:
Rosen Xu 2018-05-16 15:29:12 +08:00 committed by Thomas Monjalon
parent a654e29b50
commit b667029e90
1 changed files with 25 additions and 0 deletions
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doc/guides/rel_notes/known_issues.rst
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@ -714,3 +714,28 @@ igb_uio can not be used when running l3fwd-power
**Driver/Module**: **Driver/Module**:
``igb_uio`` 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.