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b66ed23238
This patch implements a new chardev backend `hub` device, which aggregates input from multiple backend devices and forwards it to a single frontend device. Additionally, `hub` device takes the output from the frontend device and sends it back to all the connected backend devices. This allows for seamless interaction between different backend devices and a single frontend interface. The idea of the change is trivial: keep list of backend devices (up to 4), init them on demand and forward data buffer back and forth. The following is QEMU command line example: -chardev pty,path=/tmp/pty,id=pty0 \ -chardev vc,id=vc0 \ -chardev hub,id=hub0,chardevs.0=pty0,chardevs.1=vc0 \ -device virtconsole,chardev=hub0 \ -vnc 0.0.0.0:0 Which creates 2 backend devices: text virtual console (`vc0`) and a pseudo TTY (`pty0`) connected to the single virtio hvc console with the backend aggregator (`hub0`) help. `vc0` renders text to an image, which can be shared over the VNC protocol. `pty0` is a pseudo TTY backend which provides biderectional communication to the virtio hvc console. 'chardevs.N' list syntax is used for the sake of compatibility with the representation of JSON lists in 'key=val' pairs format of the util/keyval.c, despite the fact that modern QAPI way of parsing, namely qobject_input_visitor_new_str(), is not used. Choice of keeping QAPI list syntax may help to smoothly switch to modern parsing in the future. Signed-off-by: Roman Penyaev <r.peniaev@gmail.com> Reviewed-by: "Marc-André Lureau" <marcandre.lureau@redhat.com> Cc: qemu-devel@nongnu.org Message-ID: <20250123085327.965501-3-r.peniaev@gmail.com> |
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| .. | ||
| baum.c | ||
| char-console.c | ||
| char-fd.c | ||
| char-fe.c | ||
| char-file.c | ||
| char-hmp-cmds.c | ||
| char-hub.c | ||
| char-io.c | ||
| char-mux.c | ||
| char-null.c | ||
| char-parallel.c | ||
| char-pipe.c | ||
| char-pty.c | ||
| char-ringbuf.c | ||
| char-serial.c | ||
| char-socket.c | ||
| char-stdio.c | ||
| char-udp.c | ||
| char-win-stdio.c | ||
| char-win.c | ||
| char.c | ||
| chardev-internal.h | ||
| meson.build | ||
| msmouse.c | ||
| spice.c | ||
| testdev.c | ||
| trace-events | ||
| trace.h | ||
| wctablet.c | ||