docs/system/device-emulation.rst

3 Device Emulation
15 Device Front End
18 A device front end is how a device is presented to the guest. The type
19 of device presented should match the hardware that the guest operating
21 ``--device`` command line option. Running QEMU with the command line
22 options ``--device help`` will list all devices it is aware of. Using
23 the command line ``--device foo,help`` will list the additional
24 configuration options available for that device.
29 Device Buses
34 automatically created. In most cases the BUS a device is attached to
38 (``bus=ID``) a device is attached to along with its address
45   --device foo,bus=pci.0,addr=0,id=foo
46   --device bar,bus=foo.0,addr=1,id=baz
48 which would be a bar device (with the ID of baz) which is attached to
49 the first foo bus (foo.0) at address 1. The foo device which provides
53 Device Back End
56 The back end describes how the data from the emulated device will be
58 specific to the class of device being emulated. For example serial
70 Device Pass Through
73 Device pass through is where the device is actually given access to
75 USB device on the host system to the guest or dedicating a video card