From mboxrd@z Thu Jan  1 00:00:00 1970
From: bugzilla@dpdk.org
Subject: [Bug 76] 2MB hugepages with IOMMU and passthrough not
	working
Date: Wed, 25 Jul 2018 09:18:53 +0000
Message-ID: <bug-76-3@http.bugs.dpdk.org/>
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https://bugs.dpdk.org/show_bug.cgi?id=3D76

            Bug ID: 76
           Summary: 2MB hugepages with IOMMU and passthrough not working
           Product: DPDK
           Version: 18.05
          Hardware: All
                OS: All
            Status: CONFIRMED
          Severity: normal
          Priority: Normal
         Component: core
          Assignee: dev@dpdk.org
          Reporter: kevuzaj@gmail.com
  Target Milestone: ---

With this combination, when testpmd is run in the guest after some initial
packets (< 1000), all other packets are Rx-missed. Working in 18.02.0, not
working in 18.05.0 or master (711f43ba568ac).=20

i.e. combination of below in libvirt xml, with 2MB hugepages in guest not
working.

    <hostdev mode=3D'subsystem' type=3D'pci' managed=3D'yes'>
      <driver name=3D'vfio'/>
      <source>
        <address domain=3D'0x0000' bus=3D'0x01' slot=3D'0x00' function=3D'0=
x0'/>
      </source>
      <address type=3D'pci' domain=3D'0x0000' bus=3D'0x06' slot=3D'0x00'
function=3D'0x0'/>
    </hostdev>
    <hostdev mode=3D'subsystem' type=3D'pci' managed=3D'yes'>
      <driver name=3D'vfio'/>
      <source>
        <address domain=3D'0x0000' bus=3D'0x01' slot=3D'0x00' function=3D'0=
x1'/>
      </source>
      <address type=3D'pci' domain=3D'0x0000' bus=3D'0x07' slot=3D'0x00'
function=3D'0x0'/>
    </hostdev>

...

    <iommu model=3D'intel'>
      <driver intremap=3D'on' caching_mode=3D'on' iotlb=3D'on'/>
    </iommu>


Working if remove IOMMU or switch to 1GB hugepages in guest. Tested with
82599ES.

--=20
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