Re: [PATCH v3] Warn user if the vga flag is passed but no vga device is created

[Thomas Huth <thuth@redhat.com>]

On 06/05/2022 17.43, Paolo Bonzini wrote:
> On 5/6/22 16:48, Peter Maydell wrote:
>>> I'm just in progress of preparing a pull request with misc patches, I can
>>> also throw it in there if nobody minds.
>> Paolo mentioned on IRC yesterday that there was some detail he thought
>> it wasn't handling right with VGA_DEVICE, but I didn't really understand
>> the details. Paolo ?
> 
> Yeah, I was wondering if this would warn for "-device VGA".

Yes, it's possible to trigger the warning like this:

$ ./qemu-system-ppc -M ppce500 -device VGA
qemu-system-ppc: warning: A -vga option was passed but this machine type 
does not use that option; No VGA device has been created

> But if so it should be enough to do this to fix it:
> 
> diff --git a/softmmu/vl.c b/softmmu/vl.c
> index eef1558281..7ff76b795a 100644
> --- a/softmmu/vl.c
> +++ b/softmmu/vl.c
> @@ -1352,6 +1352,7 @@ static void qemu_disable_default_devices(void)
> 
>       if (!vga_model && !default_vga) {
>           vga_interface_type = VGA_DEVICE;
> +        vga_interface_created = true;
>       }
>       if (!has_defaults || machine_class->no_serial) {
>           default_serial = 0;

That fixes the warning, indeed. Thanks, I'll fix up the patch with this hunk 
and respin my pull request.

  Thomas