Re: [PATCH v5 0/4] arm64: cross-CPU NMI via SDEI

[Kiryl Shutsemau]

On Mon, Jun 29, 2026 at 04:07:14PM +0100, Kiryl Shutsemau wrote:
> From: "Kiryl Shutsemau (Meta)" <kas@xxxxxxxxxx>
> 
> A class of debug/observability features needs to interrupt a CPU that has
> its interrupts locally masked: the all-CPU backtrace behind sysrq-l /
> RCU-stall / hung-task / hard-lockup dumps, and crash_smp_send_stop()
> capturing a stuck CPU's state into the vmcore. On arm64 these need a
> mechanism that reaches a CPU spinning with DAIF masked, which a normal IPI
> cannot.

Gentle ping. Any feedback?

I'm looking forward to finding an upstreamable solution to the problem.

-- 
  Kiryl Shutsemau / Kirill A. Shutemov