docs/system/device-emulation.rst

1 .. _device-emulation:
4 ----------------
15 Device Front End
18 A device front end is how a device is presented to the guest. The type
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
26 A front end is often paired with a back end, which describes how the
33 machine model you choose (``-M foo``) a number of buses will have been
45   --device foo,bus=pci.0,addr=0,id=foo
46   --device bar,bus=foo.0,addr=1,id=baz
53 Device Back End
56 The back end describes how the data from the emulated device will be
57 processed by QEMU. The configuration of the back end is usually
59 devices will be backed by a ``--chardev`` which can redirect the data
61 by ``--blockdev`` which will specify how blocks are handled, for
63 partition. Back ends can sometimes be stacked to implement features
66 While the choice of back end is generally transparent to the guest,
68 the back end is unable to support it.
93    devices/vhost-user.rst
94    devices/virtio-gpu.rst
95    devices/virtio-pmem.rst
96    devices/virtio-snd.rst
97    devices/vhost-user-input.rst
98    devices/vhost-user-rng.rst
100    devices/usb-u2f.rst