From mboxrd@z Thu Jan 1 00:00:00 1970 From: Rosen Xu Subject: [PATCH] doc/guides/rel_notes: Add known issue for IOMMU attributes read Date: Mon, 14 May 2018 18:44:12 +0800 Message-ID: <1526294652-102665-1-git-send-email-rosen.xu@intel.com> Cc: anatoly.burakov@intel.com, gaetan.rivet@6wind.com, john.mcnamara@intel.com, rosen.xu@intel.com, yulong.pei@intel.com, stable@dpdk.org To: dev@dpdk.org Return-path: List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org Sender: "dev" Read IOMMU attributes from linux kernle 4.10.0 error. Cc: stable@dpdk.org Signed-off-by: Rosen Xu --- 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