Re: [PATCH v5 0/4] arm64: cross-CPU NMI via SDEI
Kiryl Shutsemau <[email protected]>
| Newsgroups | org.infradead.lists.kexec,org.infradead.lists.linux-arm-kernel,org.kernel.vger.linux-kernel |
|---|---|
| Message-ID | <ak_IRHwd02EjWMf8@thinkstation> |
On Mon, Jun 29, 2026 at 04:07:14PM +0100, Kiryl Shutsemau wrote: > From: "Kiryl Shutsemau (Meta)" <[email protected]> > > 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