Re: [Qemu-devel] [PATCH] s390x/sclp: mark sclp-cpu-hotplug as non-usercreatable

[Christian Borntraeger]

On 10/04/2017 05:46 PM, Cornelia Huck wrote:
> A TYPE_SCLP_CPU_HOTPLUG device for handling cpu hotplug events
> is already created by the sclp event facility. Adding a second
> TYPE_SCLP_CPU_HOTPLUG device via -device sclp-cpu-hotplug creates
> an ambiguity in raise_irq_cpu_hotplug(), leading to a crash once
> a cpu is hotplugged.
> 
> To fix this, disallow creating a sclp-cpu-hotplug device manually.
> 
> Signed-off-by: Cornelia Huck <address@hidden>

Acked-by: Christian Borntraeger <address@hidden>

Most of these missing user_create things stem from a time of qdev.no_user
which was then later deprecated and replaced with 
cannot_instantiate_with_device_add_yet
It was supposed to be a temporary measure but now we all know that there ARE 
devices
which are not user_creatable.
    
So its good to get this all fixed.

> ---
>  hw/s390x/sclpcpu.c | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/hw/s390x/sclpcpu.c b/hw/s390x/sclpcpu.c
> index 023d059a46..3ee890b392 100644
> --- a/hw/s390x/sclpcpu.c
> +++ b/hw/s390x/sclpcpu.c
> @@ -82,6 +82,12 @@ static void cpu_class_init(ObjectClass *oc, void *data)
>      k->get_receive_mask = receive_mask;
>      k->read_event_data = read_event_data;
>      set_bit(DEVICE_CATEGORY_MISC, dc->categories);
> +    /*
> +     * Reason: raise_irq_cpu_hotplug() depends on an unique
> +     * TYPE_SCLP_CPU_HOTPLUG device, which is already created
> +     * by the sclp event facility
> +     */
> +    dc->user_creatable = false;
>  }
> 
>  static const TypeInfo sclp_cpu_info = {
>