[Qemu-devel] [Bug 1488363] Re: qemu 2.4.0 hangs using vfio for pci passthrough of graphics card

[Peter Maloney]

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

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Title:
  qemu 2.4.0 hangs using vfio for pci passthrough of graphics card

Status in QEMU:
  Fix Released

Bug description:
  2.3.0 (manjaro distro package) works fine. 2.4.0 (manjaro or the arch
  vanilla one) hangs on the SeaBIOS screen when saying "Press F12 for
  boot menu". All tested with the same hardware, OS, command and
  configuration. It also starts without the GPU passed through, even
  with the USB passed through. I am using the latest SeaBIOS 1.8.2.

  The release notes say:
   VFIO
      Support for resetting AMD Bonaire and Hawaii GPUs
      Platform device passthrough support for Calxeda xgmac devices 
      
  So maybe something there broke it.
      
  I am using the arch qemu 2.4.0 PKGBUILD (modified to have make -j8 and 
removed iscsi, gluster, ceph, etc.), which uses vanilla sources and no patches. 
https://projects.archlinux.org/svntogit/packages.git/tree/trunk?h=packages/qemu

  I am not using a frontend. I am using a script I wrote that generates
  the command below.

  Guest OS here would be 64 bit windows 7, but it didn't start so that's
  not relevant. Also a Manjaro Linux VM won't start.

  CPU is AMD FX-8150; board is Gigabyte GA-990FXA-UD5 (990FX chipset).

  full command line (without the \ after each line) is:

  qemu-system-x86_64
      -enable-kvm
      -M q35
      -m 3584
      -cpu host
      -boot c
      -smp 7,sockets=1,cores=7,threads=1
      -vga none
      -device ioh3420,bus=pcie.0,addr=1c.0,port=1,chassis=1,id=root.1
      -device 
vfio-pci,host=04:00.0,bus=root.1,multifunction=on,x-vga=on,addr=0.0,romfile=Sapphire.R7260X.1024.131106.rom
      -device vfio-pci,host=00:14.2,bus=pcie.0
      -device vfio-pci,host=00:16.0,bus=root.1
      -device vfio-pci,host=00:16.2,bus=root.1
      -usb
      -device ahci,bus=pcie.0,id=ahci
      -drive 
file=/dev/data/vm1,id=disk1,format=raw,if=virtio,index=0,media=disk,discard=on
      -drive media=cdrom,id=cdrom,index=5,media=cdrom
      -netdev type=tap,id=net0,ifname=tap-vm1
      -device virtio-net-pci,netdev=net0,mac=00:01:02:03:04:05
      -monitor stdio
      -boot menu=on

  
  $ lspci -nn | grep -E "04:00.0|00:14.2|00:16.0|00:16.2"
  00:14.2 Audio device [0403]: Advanced Micro Devices, Inc. [AMD/ATI] SBx00 
Azalia (Intel HDA) [1002:4383] (rev 40)
  00:16.0 USB controller [0c03]: Advanced Micro Devices, Inc. [AMD/ATI] 
SB7x0/SB8x0/SB9x0 USB OHCI0 Controller [1002:4397]
  00:16.2 USB controller [0c03]: Advanced Micro Devices, Inc. [AMD/ATI] 
SB7x0/SB8x0/SB9x0 USB EHCI Controller [1002:4396]
  04:00.0 VGA compatible controller [0300]: Advanced Micro Devices, Inc. 
[AMD/ATI] Bonaire XTX [Radeon R7 260X] [1002:6658]

  
  Also I have this one that also hangs:
  05:00.0 VGA compatible controller [0300]: Advanced Micro Devices, Inc. 
[AMD/ATI] Juniper XT [Radeon HD 6770] [1002:68ba]

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