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

[Thomas Huth <thuth@redhat.com>]

On 04.10.2017 17:46, 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 <cohuck@redhat.com>
> ---
>  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;
>  }

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