Re: [Qemu-devel] [PATCH] spapr_rng: disable hotpluggability

[Thomas Huth <thuth@redhat.com>]

On 25.02.2016 12:08, Greg Kurz wrote:
> It is currently possible to hotplug a spapr_rng device but QEMU crashes
> when we try to hot unplug:
> 
> ERROR:hw/core/qdev.c:295:qdev_unplug: assertion failed: (hotplug_ctrl)
> Aborted
> 
> This happens because spapr_rng isn't plugged to any bus and sPAPR does
> not provide hotplug support for it: qdev_get_hotplug_handler() hence
> return NULL and we hit the assertion.
> 
> And anyway, it doesn't make much sense to unplug this device since hcalls
> cannot be unregistered. Even the idea of hotplugging a RNG device instead
> of declaring it on the QEMU command line looks weird.
> 
> This patch simply disables hotpluggability for the spapr-rng class.
> 
> Signed-off-by: Greg Kurz <gkurz@linux.vnet.ibm.com>
> ---
>  hw/ppc/spapr_rng.c |    1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/hw/ppc/spapr_rng.c b/hw/ppc/spapr_rng.c
> index 8484fcf54774..a39d472b66fd 100644
> --- a/hw/ppc/spapr_rng.c
> +++ b/hw/ppc/spapr_rng.c
> @@ -170,6 +170,7 @@ static void spapr_rng_class_init(ObjectClass *oc, void *data)
>      dc->realize = spapr_rng_realize;
>      set_bit(DEVICE_CATEGORY_MISC, dc->categories);
>      dc->props = spapr_rng_properties;
> +    dc->hotpluggable = false;
>  }

That makes sense!

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