Re: [PATCH v4 0/4] arm64: cross-CPU NMI via SDEI

Breno Leitao <[email protected]>
Newsgroups org.infradead.lists.kexec,org.infradead.lists.linux-arm-kernel,org.kernel.vger.linux-kernel
Message-ID <[email protected]> 
On Mon, Jun 22, 2026 at 09:52:40AM -0700, Doug Anderson wrote:
> Having them as a stop-gap until true NMI is available
> seems nice to me

I completely agree. Should these patches unfortunately not make it upstream,
my plan is to maintain them downstream at Meta kernels until the Meta fleet
no longer contains any non-FEAT_NMI hosts.

The trade-offs under consideration are:

	1) Accept the performance overhead from pseudo-NMI
	2) Lose debuggability by disabling NMI entirely
	3) Maintain downstream patches

Of these three options, carrying downstream patches appears to be the least
disruptive path for our business needs.
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