[Qemu-devel] [Bug 1175513] Re: Qemu 1.5.0 gpu clock control doesn`t work after guest reboot

[Alex Williamson]

One-shot use is about the state of the art until we implement a way for
vfio to do a bus reset on devices.  A couple comments on the usage;
we're using the x-vga option to vfio-pci and also using -vga qxl.
Without specifying a bus for the vfio-pci device this will put qxl vga
and vfio vga both on the root complex with no way to switch between them
aside from completely disabling the device.  This likely means qxl is
disabled and effectively the same as booting with -vga none.  Second
oddity, vfio vga support wasn't added to the kernel until 3.9, how does
this qemu command like work on 3.8?

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

Title:
  Qemu 1.5.0 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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