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

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From: Ingo Molnar <mingo@...>
To: H. Peter Anvin <hpa@...>
Cc: Vivek Goyal <vgoyal@...>, Neil Horman <nhorman@...>, <tglx@...>, <mingo@...>, <kexec@...>, <linux-kernel@...>
Subject: Re: [PATCH], issue EOI to APIC prior to calling crash_kexec in die_nmi path
Date: Wednesday, February 6, 2008 - 7:36 pm

* H. Peter Anvin <hpa@zytor.com> wrote:


cross-CPU IPIs are a bit fragile on some PC platforms. So if the kexec 
code relies on getting IPIs to all other CPUs, it might not be able to 
do it reliably. There might be limitations on how many APIC irqs there 
can be queued at a time, and if those slots are used up and the CPU is 
not servicing irqs then stuff gets retried. This might even affect NMIs 
sent via APIC messages - not sure about that.

	Ingo
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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)