qemu-system-x86_64 -machine accel=kvm -smp 2 -m 1024 -net none -device usb-ehci,id=usb,bus=pci.0,addr=0x4 -device usb-host,hostbus=2,hostaddr=4 -usb -usbdevice tablet -hda win7-profess -soundhw hda -boot c