6.2.0 Regression with Intel GVT-g

Host environment

• Operating system: ArchLinux
• OS/kernel version: 5.15.8-arch1-1 (custom patches for gvt-g)
• Architecture: x86_64
• QEMU flavor: qemu-system-x86_64
• QEMU version: 6.2.0
• QEMU command line: libvirt

  /usr/bin/qemu-system-x86_64 \
  # ...
  -device vfio-pci,id=hostdev0,sysfsdev=/sys/bus/mdev/devices/$GVT_UUID,display=on,bus=pci.5,addr=0x0 \
  -set device.hostdev0.x-igd-opregion=on \
  -set device.hostdev0.display=on \
  -set device.hostdev0.ramfb=on \
  -set device.hostdev0.driver=vfio-pci-nohotplug \
  -set device.hostdev0.romfile=/vms/win11-cefet/vbios_gvt_uefi.rom

Emulated/Virtualized environment

• Operating system: Windows 11
• Architecture: x86_64

Description of problem

Until version 6.1.0 the Intel GVT-g graphics passtrought was working flawless. But, since the version 6.2.0 the machine with the exact same configuration is not working anymore, presenting an error that the graphics device was not found.

qemu-system-x86_64: -set device.hostdev0.x-igd-opregion=on: there is no device "hostdev0" defined

Downgrade to 6.1.0 fixes the problem.

Steps to reproduce

1. Create a virtual machine with GVT-g
2. Try to run the machine.