Subject: Re: [PATCH] arm64/irq: use NMI to send stop IPI

From: Marc Zyngier <[email-masked]>
Date: Tue, 08 Dec 2020 14:04:49 +0000

On 2020-12-08 13:14, Pingfan Liu wrote:
> Like other arches, both 'kexec -l' and 'kexec -p' expect to use NMI to
> interrupt other cpus in order to capture cpus tightly to a known state.
> 
> So for both of the cases, try to use NMI IPI if irqchip supports NMI.

There are at least 2 other competing series doing the same thing,
and (ab)using NMIs for dubious purposes (kexec, kgdb...)

(1) Please work with others instead of reinventing things from scratch,
     with similar problems

(2) No additional NMI patches will make it until we have resolved the 
issues
     described in [1], which is likely to take some time

Thanks,

         M.

[1] 
https://lore.kernel.org/linux-arm-kernel/[email-masked]/
-- 
Jazz is not dead. It just smells funny...

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