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

[Alex Williamson]

You've somehow managed to not load the vfio_iommu_type1 module.  The
vfio module will request it when loading, if the module is not available
when loading, such as from an initramfs that does not include the full
set of vfio modules, it will need to be loaded later manually.

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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:
  New

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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