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Re: [PATCH], issue EOI to APIC prior to calling crash_kexec in die_nmi path

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From: Andi Kleen <andi@...>
To: Ingo Molnar <public-mingo-X9Un+BFzKDI@...>
Cc: Neil Horman <public-nhorman-2XuSBdqkA4R54TAoqtyWWQ@...>, <public-kexec-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@...>, <public-linux-kernel-u79uwXL29TY76Z2rM5mHXA@...>, <public-mingo-H+wXaHxf7aLQT0dZR+AlfA@...>, Eric W. Biederman <public-ebiederm-aS9lmoZGLiVWk0Htik3J/w@...>, H. Peter Anvin <public-hpa-YMNOUZJC4hwAvxtiuMwx3w@...>, <public-tglx-hfZtesqFncYOwBW4kG4KsQ@...>, Vivek Goyal <public-vgoyal-H+wXaHxf7aLQT0dZR+AlfA@...>
Subject: Re: [PATCH], issue EOI to APIC prior to calling crash_kexec in die_nmi path
Date: Friday, February 8, 2008 - 12:54 pm

Ingo Molnar <mingo-X9Un+BFzKDI@public.gmane.org> writes:

Just if you do this while running on the NMI stack (and I think
you do if you insert it at the same place as Neil's original patch)
and another NMI happens for some reason you will be dead
because your stack will corrupt.

If you really want nested NMIs you would need to fix up the NMI
stacks first by pointing them below your own stack.

-Andi

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Messages in current thread:
[PATCH], issue EOI to APIC prior to calling crash_kexec in d..., Neil Horman, (Wed Feb 6, 3:25 pm)
Re: [PATCH], issue EOI to APIC prior to calling crash_kexec ..., Ingo Molnar, (Wed Feb 6, 6:00 pm)
Re: [PATCH], issue EOI to APIC prior to calling crash_kexec ..., Vivek Goyal, (Wed Feb 6, 6:48 pm)
Re: [PATCH], issue EOI to APIC prior to calling crash_kexec ..., H. Peter Anvin, (Wed Feb 6, 6:56 pm)
Re: [PATCH], issue EOI to APIC prior to calling crash_kexec ..., Ingo Molnar, (Wed Feb 6, 7:36 pm)
Re: [PATCH], issue EOI to APIC prior to calling crash_kexec ..., Eric W. Biederman, (Wed Feb 6, 8:31 pm)
Re: [PATCH], issue EOI to APIC prior to calling crash_kexec ..., Neil Horman, (Thu Feb 7, 8:17 am)
Re: [PATCH], issue EOI to APIC prior to calling crash_kexec ..., Ingo Molnar, (Thu Feb 7, 8:24 am)
Re: [PATCH], issue EOI to APIC prior to calling crash_kexec ..., Andi Kleen, (Fri Feb 8, 12:54 pm)
Re: [PATCH], issue EOI to APIC prior to calling crash_kexec ..., Neil Horman, (Fri Feb 8, 12:14 pm)
Re: [PATCH], issue EOI to APIC prior to calling crash_kexec ..., Vivek Goyal, (Fri Feb 8, 12:45 pm)
Re: [PATCH], issue EOI to APIC prior to calling crash_kexec ..., Neil Horman, (Tue Feb 12, 5:08 pm)
Re: [PATCH], issue EOI to APIC prior to calling crash_kexec ..., Neil Horman, (Wed Feb 20, 10:57 am)
Re: [PATCH], issue EOI to APIC prior to calling crash_kexec ..., Eric W. Biederman, (Fri Feb 15, 10:02 am)
Re: [PATCH], issue EOI to APIC prior to calling crash_kexec ..., Neil Horman, (Fri Feb 8, 1:26 pm)
Re: [PATCH], issue EOI to APIC prior to calling crash_kexec ..., Neil Horman, (Thu Feb 7, 4:37 pm)
Re: [PATCH], issue EOI to APIC prior to calling crash_kexec ..., Ingo Molnar, (Wed Feb 6, 8:39 pm)
Re: [PATCH], issue EOI to APIC prior to calling crash_kexec ..., Eric W. Biederman, (Wed Feb 6, 9:30 pm)
Re: [PATCH], issue EOI to APIC prior to calling crash_kexec ..., Vivek Goyal, (Wed Feb 6, 7:50 pm)
Re: [PATCH], issue EOI to APIC prior to calling crash_kexec ..., Ingo Molnar, (Wed Feb 6, 6:53 pm)
Re: [PATCH], issue EOI to APIC prior to calling crash_kexec ..., Vivek Goyal, (Wed Feb 6, 3:40 pm)
Re: [PATCH], issue EOI to APIC prior to calling crash_kexec ..., Neil Horman, (Wed Feb 6, 4:12 pm)
Re: [PATCH], issue EOI to APIC prior to calling crash_kexec ..., Vivek Goyal, (Wed Feb 6, 4:35 pm)
Re: [PATCH], issue EOI to APIC prior to calling crash_kexec ..., H. Peter Anvin, (Wed Feb 6, 4:21 pm)
Re: [PATCH], issue EOI to APIC prior to calling crash_kexec ..., Neil Horman, (Wed Feb 6, 5:04 pm)