Re: [Xen-devel] [PATCH 2/6] xen/hvm kexec: unregister shutdown+sysrq watches during reboot

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

On Tue, Jul 26, 2011 at 01:52:11PM +0200, Olaf Hering wrote:
> Unregister the shutdown and sysrq watch during kexec.  The watches can
> not be re-registered in the kexec kernel because they are still seen as
> busy by xenstore.

So this is the PV or HVM guest doing the kexec?

> 
> Signed-off-by: Olaf Hering <olaf@xxxxxxxxx>
> 
> ---
>  drivers/xen/manage.c |   13 +++++++++++++
>  1 file changed, 13 insertions(+)
> 
> Index: linux-3.0/drivers/xen/manage.c
> ===================================================================
> --- linux-3.0.orig/drivers/xen/manage.c
> +++ linux-3.0/drivers/xen/manage.c
> @@ -320,6 +320,18 @@ static int shutdown_event(struct notifie
>       return NOTIFY_DONE;
>  }
>  
> +static void xenbus_disable_shutdown_watcher(void)
> +{
> +     unregister_xenbus_watch(&shutdown_watch);
> +#ifdef CONFIG_MAGIC_SYSRQ
> +     unregister_xenbus_watch(&sysrq_watch);
> +#endif
> +}
> +
> +static struct syscore_ops xenbus_watcher_syscore_ops = {
> +     .shutdown = xenbus_disable_shutdown_watcher,
> +};
> +
>  int xen_setup_shutdown_event(void)
>  {
>       static struct notifier_block xenstore_notifier = {
> @@ -329,6 +341,7 @@ int xen_setup_shutdown_event(void)
>       if (!xen_domain())
>               return -ENODEV;
>       register_xenstore_notifier(&xenstore_notifier);
> +     register_syscore_ops(&xenbus_watcher_syscore_ops);
>  
>       return 0;
>  }
> 
> 
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