linux-kernel - Re: [V5][PATCH 4/6] x86, nmi: add in logic to handle multiple events and unknown NMIs

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Date:	Wed, 21 Sep 2011 08:45:06 +0300
From:	Avi Kivity <avi@...hat.com>
To:	Don Zickus <dzickus@...hat.com>
CC:	x86@...nel.org, Andi Kleen <andi@...stfloor.org>,
	Robert Richter <robert.richter@....com>,
	Peter Zijlstra <peterz@...radead.org>, ying.huang@...el.com,
	LKML <linux-kernel@...r.kernel.org>, paulmck@...ux.vnet.ibm.com,
	jeremy@...p.org
Subject: Re: [V5][PATCH 4/6] x86, nmi:  add in logic to handle multiple events
 and unknown NMIs

On 09/20/2011 11:10 PM, Don Zickus wrote:
> On Tue, Sep 20, 2011 at 08:23:03PM +0300, Avi Kivity wrote:
> >  >V4:
> >  >    - clean up fixes, like adding 'static', rename save_rip to last_nmi_rip
> >  >
> >  >
> >
> >  Missing a zeroing of last_nmi_rip in the idle path.  Otherwise, as
> >  Andi points out, and idle machine will always see NMIs coming in
> >  from the hlt/mwait address and detect them as back-to-back NMIs.
>
> You mean something like this?
>

Yes.

-- 
I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.

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