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

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Date:	Mon, 11 Oct 2010 00:23:57 +0400
From:	Cyrill Gorcunov <gorcunov@...il.com>
To:	"Maciej W. Rozycki" <macro@...ux-mips.org>,
	Don Zickus <dzickus@...hat.com>
Cc:	Andi Kleen <andi@...stfloor.org>, mingo@...e.hu,
	fweisbec@...il.com, robert.richter@....com,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC] arch generic way to trigger unknown NMIs

On Thu, Oct 07, 2010 at 11:45:59PM +0100, Maciej W. Rozycki wrote:
> On Thu, 7 Oct 2010, Don Zickus wrote:
> 
> > No I prefer a single one too, but there didn't seem to be a
> > send_IPI_self() command, so I took the short route and sent it to
> > everyone. :-(
> 
>  Odd, APIC hardware does explicitly support such a mode (there are three 
> shorthands like this actually: all-but-self, all and self), so why don't 
> just add a suitable wrapper?
> 
>   Maciej
> 

We have send_IPI_self which can't be used for NMI delivery mode (ie with
self shortland) but still can be used as say (didn't test)

	apic->send_IPI_mask(cpumask_of(cpu), NMI_VECTOR)

where cpu is a target.

  Cyrill
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