[dpdk-dev] [Bug 76] 2MB hugepages with IOMMU and passthrough not working

[bugzilla at dpdk.org]

https://bugs.dpdk.org/show_bug.cgi?id=76

            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 at dpdk.org
          Reporter: kevuzaj at 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). 

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

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

...

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


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

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