From: Kiryl Shutsemau <kas@kernel.org>
To: Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will@kernel.org>, James Morse <james.morse@arm.com>
Cc: Mark Rutland <mark.rutland@arm.com>,
Marc Zyngier <maz@kernel.org>,
Doug Anderson <dianders@chromium.org>,
Petr Mladek <pmladek@suse.com>,
Thomas Gleixner <tglx@linutronix.de>,
Andrew Morton <akpm@linux-foundation.org>,
Baoquan He <bhe@redhat.com>,
Puranjay Mohan <puranjay@kernel.org>,
Usama Arif <usama.arif@linux.dev>,
Breno Leitao <leitao@debian.org>,
Julien Thierry <julien.thierry.kdev@gmail.com>,
Lecopzer Chen <lecopzer@gmail.com>,
Sumit Garg <sumit.garg@kernel.org>,
kernel-team@meta.com, kexec@lists.infradead.org,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH v5 0/4] arm64: cross-CPU NMI via SDEI
Date: Thu, 9 Jul 2026 17:16:37 +0100 [thread overview]
Message-ID: <ak_IRHwd02EjWMf8@thinkstation> (raw)
In-Reply-To: <cover.1782744912.git.kas@kernel.org>
On Mon, Jun 29, 2026 at 04:07:14PM +0100, Kiryl Shutsemau wrote:
> From: "Kiryl Shutsemau (Meta)" <kas@kernel.org>
>
> 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
prev parent reply other threads:[~2026-07-09 16:16 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-06-29 15:07 [PATCH v5 0/4] arm64: cross-CPU NMI via SDEI Kiryl Shutsemau
2026-06-29 15:07 ` [PATCH v5 1/4] firmware: arm_sdei: add sdei_is_present() Kiryl Shutsemau
2026-06-30 10:47 ` Usama Arif
2026-06-30 10:57 ` Kiryl Shutsemau
2026-06-29 15:07 ` [PATCH v5 2/4] firmware: arm_sdei: add SDEI_EVENT_SIGNAL support Kiryl Shutsemau
2026-06-30 10:51 ` Usama Arif
2026-06-30 10:58 ` Kiryl Shutsemau
2026-06-29 15:07 ` [PATCH v5 3/4] drivers/firmware: add SDEI cross-CPU NMI service for arm64 Kiryl Shutsemau
2026-06-29 15:07 ` [PATCH v5 4/4] arm64: escalate smp_send_stop() to an SDEI NMI as a last resort Kiryl Shutsemau
2026-07-03 6:01 ` [PATCH v5 0/4] arm64: cross-CPU NMI via SDEI YinFengwei
2026-07-09 16:16 ` Kiryl Shutsemau [this message]
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