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| author |   Christian Ehrhardt <christian.ehrhardt@canonical.com> | 2018-06-01 09:09:08 +0200 |
|---|---|---|
| committer | Christian Ehrhardt <christian.ehrhardt@canonical.com> | 2018-06-04 15:56:02 +0200 |
| commit | 15dedf321036ae67c61f35a3ab55de767b07801f (patch) | |
| tree | 08e18a1b8bb1339a8a8b68802fe4c4ad09b9cdfb /doc/guides/rel_notes/known_issues.rst | |
| parent | 9f3a8cb4cfe59ea63e267f69700fb0fde13d7dd3 (diff) | |
New upstream version 18.05upstream-18.05-stable
Change-Id: Ib515da8d5db1114f07a5fe26239d1c2061007c1c
Signed-off-by: Christian Ehrhardt <christian.ehrhardt@canonical.com>
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. |