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Changes between Version 7 and Version 8 of UsersGuide/RunningInQEMU

2012-03-26T11:55:23Z (10 years ago)
Vojtech Horky

Several notes on USB


  • UsersGuide/RunningInQEMU

    v7 v8  
    5858== USB ==
    60 TODO write this section
     60To make use of the UHCI host controller built-into QEMU, add `-usb` option to the command line. That only initializes the USB but no devices would be present. QEMU emulates some of USB devices by its own or you can bridge real USB device from the host system. Plugging and unplugging can be specified either at the command line or from QEMU console at runtime.
     62=== Bridging of host devices ===
     64The following example assume you are running Linux box and you are able to pin-point the device you want to bridge to QEMU in `lsusb` output. The `lsusb` output can look like this
     66Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
     67Bus 002 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
     68Bus 002 Device 074: ID 04f2:0403 Chicony Electronics Co., Ltd KU-0420 keyboard
     71If you want to bridge the Chicony keyboard, you add another option ``-usbdevice`` with parameter ``host:2.74`` where '''2''' denotes bus number and '''74''' device number. Notice that the delimiter is a period instead of colon that is used when filtering ``lsusb`` output.
     74qemu-system-x86_64 -cdrom image.iso -usb -usbdevice host:2.74
     77Depending on your OS settings, you may need to run QEMU with higher privileges.
     79QEMU will grab the device from your OS and you will no longer be able to use it in the host system (rather do not try it). When QEMU terminates, it releases the control. Depending on your OS and QEMU version you are using, it might be needed to physically reattach the device, before the host OS can work with it again.
     82=== Emulated devices ===
     84QEMU by itself is able to emulate keyboard, mouse, tablet and a mass storage backed by a file representing disk image. To use emulated keyboard and mouse, run QEMU like this.
     87qemu-system-x86_64 -cdrom image.iso -usb -usbdevice keyboard -usbdevice mouse
     90Note that using the emulated USB keyboard disables the standard AT keyboard, thus you will not be able to use kernel console (more details at discontinued [ USB Trac]).
     92The disk image is specified as `disk:filename`. Following command shall create an illusion that `image.iso` is on a mass storage device plugged to the machine:
     95qemu-system-x86_64 -cdrom image.iso -usb -usbdevice disk:image.iso
     99=== Working with USB devices in the control console