linux-kernel - Re: [RFC] arch generic way to trigger unknown NMIs

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Date:	Thu, 7 Oct 2010 09:26:41 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Don Zickus <dzickus@...hat.com>
Cc:	mingo@...e.hu, fweisbec@...il.com, andi@...stfloor.org,
	robert.richter@....com, gorcunov@...il.com,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC] arch generic way to trigger unknown NMIs


Having a regression test for this is good, but it would 
be also good if it wasn't a private one but in some public
git repository.

>  static struct jprobe lkdtm;
> @@ -340,6 +343,9 @@ static void lkdtm_do_action(enum ctype which)
>  		set_current_state(TASK_UNINTERRUPTIBLE);
>  		schedule();
>  		break;
> +	case NMI:
> +		apic->send_IPI_allbutself(NMI_VECTOR);
> +		break;
>  	case NONE:
>  	default:
>  		break;
> 
> Anyone have any thoughts?  Maybe there is an easier way?

Do you really want the NMI on all CPUs - 1? Normally it's directed to
a single one.

-Andi
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