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

[David Woodhouse]

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?

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