[Qemu-devel] [Bug 1529187] Re: vfio passtrhough fails at 'No available IOMMU models' on Intel BDW-EP platform

[Robert Hu]

You're right. After I manually load vfio_iommu_type1, the error is gone.

** Changed in: qemu
       Status: New => Invalid

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https://bugs.launchpad.net/bugs/1529187

Title:
  vfio passtrhough fails at 'No available IOMMU models' on Intel BDW-EP
  platform

Status in QEMU:
  Invalid

Bug description:
  Environment:
   ------------
   Host OS (ia32/ia32e/IA64): ia32e
   Guest OS (ia32/ia32e/IA64): ia32e
   Guest OS Type (Linux/Windows): linux
   kvm.git Commit: da3f7ca3
   qemu.git Commit: 38a762fe 
   Host Kernel Version: 4.4.0-rc2
   Hardware: BDW EP (Intel(R) Xeon(R) CPU E5-2699 v4 @ 2.20GHz, Grantley-EP)

  Bug description:
   --------------------------
   when create guest with vt-d assignment using vfio-pci driver, the guest can 
not be created.
  Warning 'No available IOMMU models'

  
  Reproduce steps:
   ----------------
   1. bind device to vfio-pci driver
   2. qemu-system-x86_64 -enable-kvm -m 512 -smp 2 -device 
vfio-pci,host=81:00.0 -net none -drive 
file=rhel7u2.qcow2,if=none,id=virtio-disk0 -device 
virtio-blk-pci,drive=virtio-disk0

  Current result:
   ----------------
   qemu-system-x86_64: -device vfio-pci,host=81:00.0: vfio: No available IOMMU 
models
   qemu-system-x86_64: -device vfio-pci,host=81:00.0: vfio: failed to setup 
container for group 41
   qemu-system-x86_64: -device vfio-pci,host=81:00.0: vfio: failed to get group 
41
   qemu-system-x86_64: -device vfio-pci,host=81:00.0: Device initialization 
failed

  Expected result:
   ----------------
   guest can be created
  Basic root-causing log:
   ----------------------
  

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