[Qemu-devel] [Bug 1175513] Re: Qemu 1.5-git gpu clock control doesn`t work after guest reboot

[commiethebeastie]

I installed Windows 8 with VFIO_PCI_VGA, vfio-vga-reset branches and
"-vga none -device vfio-pci,host=02:00.0,x-vga=on" I received an error:

"qemu-system-x86_64: Attempt to reset PCI bus for VGA support failed
(Inappropriate ioctl for device). VGA may not work." on start.

Then I installed the catalyst drivers. I started the Valley benchmark
and the video card is working in normally 3D mode. After rebooting the
host system does not hang, but in guest graphics card was in powersafe
mode with 100 mhz GPU and 300 mhz memry clocks.

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https://bugs.launchpad.net/bugs/1175513

Title:
  Qemu 1.5-git gpu clock control doesn`t work after guest reboot

Status in QEMU:
  New

Bug description:
  I run qemu from git with such command:

  qemu-system-x86_64 -nodefaults -m 4096 -smp 8,cores=4,threads=2,sockets=1 
-cpu 'kvm64' -device usb-mouse -M q35 -vga qxl -no-hpet -boot once=c,menu=on 
-device vfio-pci,host=02:00.0,x-vga=on \
  -enable-kvm -monitor stdio -chardev 
socket,path=/tmp/qga.sock,server,nowait,id=qga0 -device virtio-serial -device 
virtserialport,chardev=qga0,name=org.qemu.guest_agent.0 -net 
nic,vlan=0,model=e1000 -net tap,ifname=tap0,script=/etc/guest-ifup -usb -device 
intel-hda -device hda-duplex \
  -drive 
file='/home/<user>/qemu/win7',if=none,id=drive-virtio-disk0,cache=writeback,aio=native,format=qed,discard=on
 -device virtio-blk-pci,drive=drive-virtio-disk0,id=virtio-disk \
  -drive 
file='/dev/sr0',if=none,id=drive-ide1-0-0,media=cdrom,snapshot=off,format=raw 
-device ide-drive,bus=ide.1,unit=0,drive=drive-ide1-0-0,id=ide1-0-0 \
  -spice port=5930,disable-ticketing

  Before guest (Windows 7) reboot, videocard works in 3D mode with full
  frequency. But after reboot videocard works in 3D only with powersafe
  frequency. Then I must reboot host for recover gpu clock control.

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