Mouse and Keyboard not working in qemu emulator

The problem was, I need to specify USB bus number with device number for USB Pass-Through. Get the list of USB's by this command lsusb and it will list them as following:

My keyboard bus number is 002 and address is 001. So, change the command based on the device number and address. So, my command will be as follows:

qemu-system-arm -M overo -m 256 -sd ./test.img -clock unix -serial stdio -usb -device usb-host,hostbus=2,hostaddr=1

You need to add this line -usb -device usb-host,hostbus=2,hostaddr=1 based on the device number and address. To get cursor pointer working add -show-cursor as specified by here

Add -show-cursor argument to your command.

i.e qemu-system-arm -M overo -m 256 -sd ./test.img -clock unix -serial stdio -device usb-mouse -device usb-kbd -show-cursor

That will emulate your cursor pointer

I had the same problem, installing os x 10.0 and the keyboard stopped working, on installing os x 10.1 no mouse even, but after removing the following entries I got it to work (OS X gave me a hint saying USB error at start up in verbose mode)

-device usb-mouse -device usb-kbd