From: "H. Peter Anvin" <hpa@zytor.com>
To: Neil Horman <nhorman@redhat.com>
Cc: Neil Horman <nhorman@tuxdriver.com>,
kexec@lists.infradead.org, linux-kernel@vger.kernel.org,
mingo@redhat.com, tglx@linutronix.de,
Vivek Goyal <vgoyal@redhat.com>
Subject: Re: [PATCH], issue EOI to APIC prior to calling crash_kexec in die_nmi path
Date: Wed, 06 Feb 2008 12:21:30 -0800 [thread overview]
Message-ID: <47AA16CA.6000003@zytor.com> (raw)
In-Reply-To: <20080206201223.GA25183@hmsendeavour.rdu.redhat.com>
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
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WARNING: multiple messages have this Message-ID (diff)
From: "H. Peter Anvin" <hpa@zytor.com>
To: Neil Horman <nhorman@redhat.com>
Cc: 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, 06 Feb 2008 12:21:30 -0800 [thread overview]
Message-ID: <47AA16CA.6000003@zytor.com> (raw)
In-Reply-To: <20080206201223.GA25183@hmsendeavour.rdu.redhat.com>
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
next prev parent reply other threads:[~2008-02-06 20:25 UTC|newest]
Thread overview: 50+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-02-06 19:25 [PATCH], issue EOI to APIC prior to calling crash_kexec in die_nmi path Neil Horman
2008-02-06 19:25 ` Neil Horman
2008-02-06 19:40 ` Vivek Goyal
2008-02-06 19:40 ` Vivek Goyal
2008-02-06 20:12 ` Neil Horman
2008-02-06 20:12 ` Neil Horman
2008-02-06 20:21 ` H. Peter Anvin [this message]
2008-02-06 20:21 ` H. Peter Anvin
2008-02-06 21:04 ` Neil Horman
2008-02-06 21:04 ` Neil Horman
2008-02-06 20:35 ` Vivek Goyal
2008-02-06 20:35 ` Vivek Goyal
2008-02-06 22:00 ` Ingo Molnar
2008-02-06 22:00 ` Ingo Molnar
2008-02-06 22:48 ` Vivek Goyal
2008-02-06 22:48 ` Vivek Goyal
2008-02-06 22:53 ` Ingo Molnar
2008-02-06 22:53 ` Ingo Molnar
2008-02-06 22:56 ` H. Peter Anvin
2008-02-06 22:56 ` H. Peter Anvin
2008-02-06 23:36 ` Ingo Molnar
2008-02-06 23:36 ` Ingo Molnar
2008-02-06 23:50 ` Vivek Goyal
2008-02-06 23:50 ` Vivek Goyal
2008-02-07 0:31 ` Eric W. Biederman
2008-02-07 0:31 ` Eric W. Biederman
2008-02-07 0:39 ` Ingo Molnar
2008-02-07 0:39 ` Ingo Molnar
2008-02-07 1:30 ` Eric W. Biederman
2008-02-07 1:30 ` Eric W. Biederman
2008-02-07 12:17 ` Neil Horman
2008-02-07 12:17 ` Neil Horman
2008-02-07 12:24 ` Ingo Molnar
2008-02-07 12:24 ` Ingo Molnar
2008-02-07 20:37 ` Neil Horman
2008-02-07 20:37 ` Neil Horman
2008-02-08 16:14 ` Neil Horman
2008-02-08 16:14 ` Neil Horman
2008-02-08 16:45 ` Vivek Goyal
2008-02-08 16:45 ` Vivek Goyal
2008-02-08 17:26 ` Neil Horman
2008-02-08 17:26 ` Neil Horman
2008-02-12 21:08 ` Neil Horman
2008-02-12 21:08 ` Neil Horman
2008-02-15 14:02 ` Eric W. Biederman
2008-02-15 14:02 ` Eric W. Biederman
2008-02-20 14:57 ` Neil Horman
2008-02-20 14:57 ` Neil Horman
2008-02-08 16:54 ` Andi Kleen
2008-02-08 16:54 ` Andi Kleen
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