Bug 1377958 - VFIO: include no-IOMMU mode - not supported [rhel-7.2.z]
Summary: VFIO: include no-IOMMU mode - not supported [rhel-7.2.z]
Keywords:
Status: CLOSED CURRENTRELEASE
Alias: None
Product: Red Hat Enterprise Linux 7
Classification: Red Hat
Component: Driver Update Disk
Version: 7.3
Hardware: Unspecified
OS: Unspecified
high
unspecified
Target Milestone: rc
: ---
Assignee: Petr Oros
QA Contact: Red Hat Kernel QE team
URL:
Whiteboard:
Depends On: 1299662
Blocks: 1383822
TreeView+ depends on / blocked
 
Reported: 2016-09-21 07:31 UTC by Marcel Kolaja
Modified: 2017-02-14 16:14 UTC (History)
23 users (show)

Fixed In Version: kmod-vfio-0.3-3.el7fdb.x86_64.rpm
Doc Type: Enhancement
Doc Text:
As a Technology Preview, this update adds No-IOMMU mode for virtual function I/O (VFIO) drivers. No-IOMMU mode provides the user with full user-space I/O (UIO) access to a direct memory access (DMA)-capable device without a I/O memory management unit (IOMMU). Note that in addition to not being supported, using this mode is not secure, due to the the lack of I/O management provided by IOMMU. However, it is recommended to use the VFIO No-IOMMU driver instead of UIO drivers, such as uio_pci_generic or igb_uio, for Red Hat Enterprise Linux guests that use the Data Plane Development Toolkit (DPDK) on hosts that use any of the following: - Single-root I/O virtualization (SR-IOV) - Open vSwitch-accelerated Data Plane Development Toolkit (OVS-DPDK)
Clone Of: 1299662
Environment:
Last Closed: 2017-02-14 16:14:29 UTC
Target Upstream Version:

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Description Marcel Kolaja 2016-09-21 07:31:08 UTC 
This bug has been copied from bug #1299662 and has been proposed
to be backported to 7.2 z-stream (EUS).
Comment 3 Jeff Nelson 2016-09-22 15:58:58 UTC 
According to BZ1358853#c17, this has been solved in build kmod-vfio-0.3-3.el7fdb.x86_64.rpm:

>The installation path issue and #modprobe issue both have been fixed well
>with kmod-vfio-0.3-3.el7fdb.x86_64 in 7.2GA kernel(3.10.0-327.el7.x86_64)
>and 7.2.z kernel(3.10.0-327.41.1.el7.x86_64).
Comment 4 Whitney Chadwick 2016-09-22 17:27:58 UTC 
Added the fast-datapath-rhel-7 flag and put to +
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