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[Qemu-devel] [Bug 1175513] Re: Qemu 1.5-git gpu clock control doesn`t wo


From: commiethebeastie
Subject: [Qemu-devel] [Bug 1175513] Re: Qemu 1.5-git gpu clock control doesn`t work after guest reboot
Date: Sat, 04 May 2013 18:34:43 -0000

When I use vga none -device vfio-pci,host=02:00.0,x-vga=on with "Linux
localhost 3.9.0-rc2 #2 SMP PREEMPT Sat May 4 11:45:12 MSK 2013 x86_64
AMD FX(tm)-8120 Eight-Core Processor AuthenticAMD GNU/Linux" and
VFIO_PCI_VGA support. System starting with "qemu-system-x86_64: Attempt
to reset PCI bus for VGA support failed (Inappropriate ioctl for
device). VGA may not work" warning. And Windows 7 loading with the
catalyst drivers. But when I reboot the guest, the host hangs up.

On #8, #9, #10 comments I ran system with vfio-vga-reset branch.


** Attachment added: "iommu_groups.txt"
   
https://bugs.launchpad.net/qemu/+bug/1175513/+attachment/3665078/+files/iommu_groups.txt

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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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