dpkg -l | grep libvirt
ii  libvirt-bin                         1.2.2-0ubuntu13.1.4                 amd64        programs for the libvirt library
ii  libvirt-dev                         1.2.2-0ubuntu13.1.4                 amd64        development files for the libvirt library
ii  libvirt-doc                         1.2.2-0ubuntu13.1.2                 all          documentation for the libvirt library
ii  libvirt0                            1.2.2-0ubuntu13.1.4                 amd64        library for interfacing with different virtualization systems
ii  libvirt0-dbg                        1.2.2-0ubuntu13.1.4                 amd64        library for interfacing with different virtualization systems
ii  python-libvirt                      1.2.2-0ubuntu1                      amd64        libvirt Python bindings



2014-08-10 13:50:37.720+0000: starting up
LC_ALL=C PATH=/usr/local/sbin:/usr/local/bin:/usr/bin:/usr/sbin:/sbin:/bin QEMU_AUDIO_DRV=none /usr/bin/qemu-system-x86_64 -name Win7vgapass -S -machine pc-q35-2.0,accel=kvm,usb=off -cpu SandyBridge,+pdpe1gb,+osxsave,+dca,+pcid,+pdcm,+xtpr,+tm2,+est,+vmx,+ds_cpl,+monitor,+dtes64,+pbe,+tm,+ht,+ss,+acpi,+ds,+vme -m 4096 -realtime mlock=off -smp 4,sockets=1,cores=4,threads=1 -uuid 971530ae-0db7-9014-939a-ccbee3666090 -nographic -no-user-config -nodefaults -chardev socket,id=charmonitor,path=/var/lib/libvirt/qemu/Win7vgapass.monitor,server,nowait -mon chardev=charmonitor,id=monitor,mode=control -rtc base=localtime -no-shutdown -boot strict=on -device i82801b11-bridge,id=pci.1,bus=pcie.0,addr=0x1e -device pci-bridge,chassis_nr=2,id=pci.2,bus=pci.1,addr=0x1 -device piix3-usb-uhci,id=usb,bus=pci.2,addr=0x3 -device virtio-scsi-pci,id=scsi0,bus=pci.2,addr=0x5 -drive if=none,id=drive-ide0-1-0,readonly=on,format=raw,cache=none -device ide-cd,bus=ide.1,unit=0,drive=drive-ide0-1-0,id=ide0-1-0 -drive file=/dev/ubuntu/Winxp,if=none,id=drive-virtio-disk0,format=raw,cache=none,aio=native -device virtio-blk-pci,scsi=off,bus=pci.2,addr=0x6,drive=drive-virtio-disk0,id=virtio-disk0,bootindex=1 -device intel-hda,id=sound0,bus=pci.2,addr=0x1 -device hda-duplex,id=sound0-codec0,bus=sound0.0,cad=0 -device AC97,id=sound1,bus=pci.2,addr=0x2 -device usb-host,hostbus=1,hostaddr=4,id=hostdev0 -device usb-host,hostbus=1,hostaddr=5,id=hostdev1 -device virtio-balloon-pci,id=balloon0,bus=pci.2,addr=0x4 -device ioh3420,bus=pcie.0,addr=1c.0,multifunction=on,port=1,chassis=1,id=root -device vfio-pci,host=04:00.0,bus=root,addr=00.0,multifunction=on,x-vga=on -device vfio-pci,host=04:00.1,bus=root,addr=00.1
Domain id=6 is tainted: custom-argv
qemu-system-x86_64: -device vfio-pci,host=04:00.0,bus=root,addr=00.0,multifunction=on,x-vga=on: vfio: error opening /dev/vfio/17: No such file or directory
qemu-system-x86_64: -device vfio-pci,host=04:00.0,bus=root,addr=00.0,multifunction=on,x-vga=on: vfio: failed to get group 17
qemu-system-x86_64: -device vfio-pci,host=04:00.0,bus=root,addr=00.0,multifunction=on,x-vga=on: Device initialization failed.
qemu-system-x86_64: -device vfio-pci,host=04:00.0,bus=root,addr=00.0,multifunction=on,x-vga=on: Device 'vfio-pci' could not be initialized
2014-08-10 13:50:37.930+0000: shutting down



2014-08-10 15:23:33.360+0000: starting up
LC_ALL=C PATH=/usr/local/sbin:/usr/local/bin:/usr/bin:/usr/sbin:/sbin:/bin QEMU_AUDIO_DRV=none /usr/bin/qemu-system-x86_64 -name Win7vgapass -S -machine pc-q35-2.0,accel=kvm,usb=off -cpu SandyBridge,+pdpe1gb,+osxsave,+dca,+pcid,+pdcm,+xtpr,+tm2,+est,+vmx,+ds_cpl,+monitor,+dtes64,+pbe,+tm,+ht,+ss,+acpi,+ds,+vme -m 4096 -realtime mlock=off -smp 4,sockets=1,cores=4,threads=1 -uuid 971530ae-0db7-9014-939a-ccbee3666090 -nographic -no-user-config -nodefaults -chardev socket,id=charmonitor,path=/var/lib/libvirt/qemu/Win7vgapass.monitor,server,nowait -mon chardev=charmonitor,id=monitor,mode=control -rtc base=localtime -no-shutdown -boot strict=on -device i82801b11-bridge,id=pci.1,bus=pcie.0,addr=0x1e -device pci-bridge,chassis_nr=2,id=pci.2,bus=pci.1,addr=0x1 -device piix3-usb-uhci,id=usb,bus=pci.2,addr=0x3 -device virtio-scsi-pci,id=scsi0,bus=pci.2,addr=0x5 -drive if=none,id=drive-ide0-1-0,readonly=on,format=raw,cache=none -device ide-cd,bus=ide.1,unit=0,drive=drive-ide0-1-0,id=ide0-1-0 -drive file=/dev/ubuntu/Winxp,if=none,id=drive-virtio-disk0,format=raw,cache=none,aio=native -device virtio-blk-pci,scsi=off,bus=pci.2,addr=0x6,drive=drive-virtio-disk0,id=virtio-disk0,bootindex=1 -device intel-hda,id=sound0,bus=pci.2,addr=0x1 -device hda-duplex,id=sound0-codec0,bus=sound0.0,cad=0 -device AC97,id=sound1,bus=pci.2,addr=0x2 -device usb-host,hostbus=1,hostaddr=4,id=hostdev0 -device usb-host,hostbus=1,hostaddr=5,id=hostdev1 -device virtio-balloon-pci,id=balloon0,bus=pci.2,addr=0x4 -device ioh3420,bus=pcie.0,addr=1c.0,multifunction=on,port=1,chassis=1,id=root -device vfio-pci,host=04:00.0,bus=root,addr=00.0,multifunction=on,x-vga=on -device vfio-pci,host=04:00.1,bus=root,addr=00.1
Domain id=9 is tainted: custom-argv
qemu-system-x86_64: -device vfio-pci,host=04:00.0,bus=root,addr=00.0,multifunction=on,x-vga=on: vfio: error opening /dev/vfio/17: Permission denied
qemu-system-x86_64: -device vfio-pci,host=04:00.0,bus=root,addr=00.0,multifunction=on,x-vga=on: vfio: failed to get group 17
qemu-system-x86_64: -device vfio-pci,host=04:00.0,bus=root,addr=00.0,multifunction=on,x-vga=on: Device initialization failed.
qemu-system-x86_64: -device vfio-pci,host=04:00.0,bus=root,addr=00.0,multifunction=on,x-vga=on: Device 'vfio-pci' could not be initialized
2014-08-10 15:23:33.576+0000: shutting down