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[Qemu-devel] [Bug 1288385] Re: VFIO passthrough causes assertation failu

From: T. Huth
Subject: [Qemu-devel] [Bug 1288385] Re: VFIO passthrough causes assertation failure
Date: Mon, 27 Jun 2016 21:15:23 -0000

** Changed in: qemu
       Status: Fix Committed => Fix Released

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  VFIO passthrough causes assertation failure

Status in QEMU:
  Fix Released

Bug description:
  Since commit 5e95494380ec I am no longer able to passthrough my Nvidia
  GTX 770 using VFIO. Qemu terminates with:

  qemu-system-x86_64: hw/pci/pcie.c:240: pcie_cap_slot_hotplug_common:
  Assertion `((pci_dev->devfn) & 0x07) == 0' failed.

  Above output was generated using commit f55ea6297cc0.

  Lspci of the vga card:

  01:00.0 VGA compatible controller: NVIDIA Corporation GK104 [GeForce GTX 770] 
(rev a1)
        Subsystem: Gigabyte Technology Co., Ltd Device 360c
        Kernel driver in use: vfio-pci
  01:00.1 Audio device: NVIDIA Corporation GK104 HDMI Audio Controller (rev a1)
        Subsystem: Gigabyte Technology Co., Ltd Device 360c
        Kernel driver in use: vfio-pci

  Commandline used to start qemu:

  qemu-system-x86_64 -machine accel=kvm \
          -nodefaults \
          -name VFIO-Test \
          -machine q35 \
          -cpu host \
          -smp 1 \
          -enable-kvm \
          -m 1024 \
          -k de \
          -vga none \
ioh3420,bus=pcie.0,addr=1c.0,multifunction=on,port=1,chassis=1,id=root.1 \
vfio-pci,host=01:00.0,bus=root.1,addr=00.0,multifunction=on,x-vga=on \
          -device vfio-pci,host=01:00.1,bus=root.1,addr=00.1 \
          -rtc base=utc \
          -boot order=d \
          -device ide-cd,drive=drive-cd-disk1,id=cd-disk1,unit=0 \

  Full output of git bisect:

  5e95494380ecf83c97d28f72134ab45e0cace8f9 is the first bad commit
  commit 5e95494380ecf83c97d28f72134ab45e0cace8f9
  Author: Igor Mammedov <address@hidden>
  Date:   Wed Feb 5 16:36:52 2014 +0100

      hw/pci: switch to a generic hotplug handling for PCIDevice
      make qdev_unplug()/device_set_realized() to call hotplug handler's
      plug/unplug methods if available and remove not needed anymore
      hot(un)plug handling from PCIDevice.
      In case if hotplug handler is not available, revert to the legacy
      hotplug method for compatibility with not yet converted buses.
      Signed-off-by: Igor Mammedov <address@hidden>
      Reviewed-by: Michael S. Tsirkin <address@hidden>
      Signed-off-by: Michael S. Tsirkin <address@hidden>

  :040000 040000 9bdab0d75fbc9be4fe2e4274e58e0cdcd347ac7e 
d6d6294ea9c06e80a0fc8fcabd6345dfae5137ad M    hw
  :040000 040000 d064d75ca8b8f169c41eee2683082e8f9104e968 
f2abbf9bee754ada0f49135968455fd1a69b2186 M    include
  :040000 040000 c515daff6c77f9bd2cc32873be4c5c3a1c20cbb9 
c506f5587afe8f7ee129a7ca6e3ae2e5118254f9 M    tests

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