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Re: [PATCH 1/2] chardev: implement backend chardev multiplexing
From: |
Peter Maydell |
Subject: |
Re: [PATCH 1/2] chardev: implement backend chardev multiplexing |
Date: |
Tue, 17 Sep 2024 13:56:45 +0100 |
On Tue, 17 Sept 2024 at 13:40, Peter Maydell <peter.maydell@linaro.org> wrote:
>
> On Tue, 17 Sept 2024 at 13:32, Marc-André Lureau
> <marcandre.lureau@redhat.com> wrote:
> >
> > Hi Roman
> >
> > On Fri, Sep 13, 2024 at 8:37 PM Roman Penyaev <r.peniaev@gmail.com> wrote:
> > >
> > > This patch implements multiplexing capability of several backend
> > > devices, which opens up an opportunity to use a single frontend
> > > device on the guest, which can be manipulated from several
> > > backend devices.
> > >
> > > 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 socket,path=/tmp/sock,server=on,wait=off,id=sock0 \
> > > -chardev vc,id=vc0 \
> > > -chardev mux,id=mux0,chardev=vc0,,sock0 \
> > > -device virtconsole,chardev=mux0 \
> > > -vnc 0.0.0.0:0
> > >
> > > Which creates 2 backend devices: text virtual console (`vc0`)
> > > and a socket (`sock0`) connected to the single virtio hvc
> > > console with the multiplexer (`mux0`) help. `vc0` renders
> > > text to an image, which can be shared over the VNC protocol.
> > > `sock0` is a socket backend which provides biderectional
> > > communication to the virtio hvc console.
> >
> > I think I would rather implement a new mux for this purpose, like
> > "mux-be" perhaps?
> >
> > "mux" has been a bit hidden (behind mux=on) for various reasons, and
> > is probably not at production quality level.
>
> You get a mux by default (for serial vs HMP monitor), so
> I think it's pretty heavily used and tested in that sense...
I should have said "by default for any -nographic invocation";
that's still a pretty common usage pattern, though.
-- PMM