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From: Neil Horman <nhorman@redhat.com>
To: "H. Peter Anvin" <hpa@zytor.com>
Cc: Neil Horman <nhorman@redhat.com>, Vivek Goyal <vgoyal@redhat.com>,
	Neil Horman <nhorman@tuxdriver.com>,
	tglx@linutronix.de, mingo@redhat.com, kexec@lists.infradead.org,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH], issue EOI to APIC prior to calling crash_kexec in die_nmi path
Date: Wed, 6 Feb 2008 16:04:07 -0500	[thread overview]
Message-ID: <20080206210407.GB25183@hmsendeavour.rdu.redhat.com> (raw)
In-Reply-To: <47AA16CA.6000003@zytor.com>

On Wed, Feb 06, 2008 at 12:21:30PM -0800, H. Peter Anvin wrote:
> Neil Horman wrote:
> >Can an APIC accept an NMI while already handling an NMI?  I didn't think 
> >they
> >would interrupt one another, but rather, pend until such time as the 
> >previous
> >NMI was cleared
> 
> The CPU certainly won't (there is a hidden flag that's cleared on IRET 
> which disables NMI; it's possible to re-enable NMI by executing a dummy 
> IRET inside the NMI handler.)
> 
> 	-hpa

So that would be another solution I would expect.  Would you rather I
investigate that, or is the proposed solution more reasonable?

Neil


-- 
/***************************************************
 *Neil Horman
 *Software Engineer
 *Red Hat, Inc.
 *nhorman@redhat.com
 *gpg keyid: 1024D / 0x92A74FA1
 *http://pgp.mit.edu
 ***************************************************/

  reply	other threads:[~2008-02-06 21:05 UTC|newest]

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-02-06 19:25 Neil Horman
2008-02-06 19:40 ` Vivek Goyal
2008-02-06 20:12   ` Neil Horman
2008-02-06 20:21     ` H. Peter Anvin
2008-02-06 21:04       ` Neil Horman [this message]
2008-02-06 20:35     ` Vivek Goyal
2008-02-06 22:00 ` Ingo Molnar
2008-02-06 22:48   ` Vivek Goyal
2008-02-06 22:53     ` Ingo Molnar
2008-02-06 22:56     ` H. Peter Anvin
2008-02-06 23:36       ` Ingo Molnar
2008-02-06 23:50         ` Vivek Goyal
2008-02-07  0:31         ` Eric W. Biederman
2008-02-07  0:39           ` Ingo Molnar
2008-02-07  1:30             ` Eric W. Biederman
2008-02-07 12:17           ` Neil Horman
2008-02-07 12:24             ` Ingo Molnar
2008-02-07 20:37               ` Neil Horman
2008-02-08 16:14               ` Neil Horman
2008-02-08 16:45                 ` Vivek Goyal
2008-02-08 17:26                   ` Neil Horman
2008-02-12 21:08                   ` Neil Horman
2008-02-15 14:02                     ` Eric W. Biederman
2008-02-20 14:57                     ` Neil Horman
2008-02-08 16:54               ` Andi Kleen

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