Please confirm that you're running the kernel from this branch on the host system:
git://github.com/awilliam/linux-vfio.git vfio-vga-reset Both host kernel and qemu changes are required. Unfortunately the error code from the ioctl makes it difficult to tell if it isn't available in the kernel or failed, something I need to correct in getting them upstream. These branches only modify the x-vga=on path. Comment #8 indicates using this hangs the host, but comments #9 & #10 says the bus reset call didn't work, did you perhaps boot back into the wrong kernel after the system hang? >From your lspci, 02:00.0 and 02:00.1 are below the 00:0b.0 root port. The properties of 00:0b.0 seem to indicate that 02:00.0 and 02:00.1 should be the only iommu group below this root port, so a bus reset should be available, assuming we're using the correct kernel. In addition to verifying the kernel in use, please attach the output of `find /sys/kernel/iommu_groups/` -- You received this bug notification because you are a member of qemu- devel-ml, which is subscribed to QEMU. 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. To manage notifications about this bug go to: https://bugs.launchpad.net/qemu/+bug/1175513/+subscriptions
