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From: Rosen Xu <rosen.xu@intel.com>
To: dev@dpdk.org
Cc: anatoly.burakov@intel.com, gaetan.rivet@6wind.com, john.mcnamara@intel.com,
rosen.xu@intel.com, yulong.pei@intel.com, stable@dpdk.org
Date: Mon, 14 May 2018 18:44:12 +0800
Message-Id: <1526294652-102665-1-git-send-email-rosen.xu@intel.com>
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Subject: [dpdk-dev] [PATCH] doc/guides/rel_notes: Add known issue for IOMMU
attributes read
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Read IOMMU attributes from linux kernle 4.10.0 error.
Cc: stable@dpdk.org
Signed-off-by: Rosen Xu <rosen.xu@intel.com>
---
doc/guides/rel_notes/known_issues.rst | 21 +++++++++++++++++++++
1 file changed, 21 insertions(+)
diff --git a/doc/guides/rel_notes/known_issues.rst b/doc/guides/rel_notes/known_issues.rst
index afcc2c4..74876ff 100644
--- a/doc/guides/rel_notes/known_issues.rst
+++ b/doc/guides/rel_notes/known_issues.rst
@@ -714,3 +714,24 @@ igb_uio can not be used when running l3fwd-power
**Driver/Module**:
``igb_uio`` module.
+
+
+linux kernel iommu attribute read error
+---------------------------------------
+
+**Description**:
+ Read immu attributes from /sys/devices/virtual/iommu/dmarXXX/intel-iommu/cap in linux kernel
+ 4.10.0 error. That because the link between the iommu sysfs-device and the struct intel_iommu
+ is no longer stored as driver-data.
+
+**Implication**:
+ When insmod ``vfio-pci`` and running testpmd APP, it doesn't initiate properly.
+
+**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.
--
1.8.3.1