Re: [PATCH] macio: set user_creatable to false in macio_class_init()

[Thomas Huth <thuth@redhat.com>]

On 07/11/2020 12.28, Mark Cave-Ayland wrote:
> Commit 348b8d1a76 "macio: don't reference serial_hd() directly within the device"
> removed the setting of user_creatable to false on the basis that the restriction
> was due to the use of serial_hd() in macio_instance_init().
> 
> Unfortunately this isn't the full story since the PIC object property links
> must still be set before the device is realized. Whilst it is possible to update
> the macio device and Mac machines to resolve this, the fix is too invasive at
> this point in the release cycle.
> 
> For now simply set user_creatable back to false in macio_class_init() to
> prevent QEMU from segfaulting in anticipation of the proper fix arriving in
> QEMU 6.0.
> 
> Reported-by: Thomas Huth <thuth@redhat.com>
> Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
> ---
>  hw/misc/macio/macio.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/hw/misc/macio/macio.c b/hw/misc/macio/macio.c
> index 51368884d0..bb601f782c 100644
> --- a/hw/misc/macio/macio.c
> +++ b/hw/misc/macio/macio.c
> @@ -456,6 +456,8 @@ static void macio_class_init(ObjectClass *klass, void *data)
>      k->class_id = PCI_CLASS_OTHERS << 8;
>      device_class_set_props(dc, macio_properties);
>      set_bit(DEVICE_CATEGORY_BRIDGE, dc->categories);
> +    /* Reason: requires PIC property links to be set in macio_*_realize() */
> +    dc->user_creatable = false;
>  }

Reviewed-by: Thomas Huth <thuth@redhat.com>