Re: [PULL v3 09/25] ui/console: allow to override the default VC

[Stefan Hajnoczi <stefanha@gmail.com>]

On Thu, 9 Nov 2023 at 19:10, David Woodhouse <dwmw2@infradead.org> wrote:
>
> On Tue, 2023-11-07 at 14:15 +0400, marcandre.lureau@redhat.com wrote:
> > From: Marc-André Lureau <marcandre.lureau@redhat.com>
> >
> > If a display is backed by a specialized VC, allow to override the
> > default "vc:80Cx24C".
> >
> > As suggested by Paolo, if the display doesn't implement a VC (get_vc()
> > returns NULL), use a fallback that will use a muxed console on stdio.
> >
> > This changes the behaviour of "qemu -display none", to create a muxed
> > serial/monitor by default (on TTY & not daemonized).
> >
> > Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
> > Reviewed-by: Thomas Huth <thuth@redhat.com>
>
> Hrm. This breaks the command line documented at
> https://qemu-project.gitlab.io/qemu/system/i386/xen.html
>
>  $ ./qemu-system-x86_64 --accel kvm,xen-version=0x40011,kernel-irqchip=split \
>     -display none -chardev stdio,mux=on,id=char0,signal=off -mon char0 \
>     -device xen-console,chardev=char0  -drive file=${GUEST_IMAGE},if=xen
>
> qemu-system-x86_64: cannot use stdio by multiple character devices
> qemu-system-x86_64: could not connect serial device to character backend 'stdio'
>
> Can we make it create a Xen console by default, instead of a serial
> port? And/or make it *not* use stdio if something else on the command
> line already does?

I have filed this in QEMU's bug tracker so it's not forgotten:
https://gitlab.com/qemu-project/qemu/-/issues/1974

Here is the list of open 8.2 bugs:
https://gitlab.com/qemu-project/qemu/-/milestones/10

Stefan