linux-kernel - [PATCH 0/3] Add NMI Support to RISC-V via SSE

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Message-Id: <20251027133431.15321-1-cuiyunhui@bytedance.com>
Date: Mon, 27 Oct 2025 21:34:28 +0800
From: Yunhui Cui <cuiyunhui@...edance.com>
To: paul.walmsley@...ive.com,
	palmer@...belt.com,
	aou@...s.berkeley.edu,
	alex@...ti.fr,
	conor@...nel.org,
	cuiyunhui@...edance.com,
	luxu.kernel@...edance.com,
	atishp@...osinc.com,
	cleger@...osinc.com,
	ajones@...tanamicro.com,
	apatel@...tanamicro.com,
	linux-kernel@...r.kernel.org,
	linux-riscv@...ts.infradead.org,
	songshuaishuai@...ylab.org,
	bjorn@...osinc.com,
	charlie@...osinc.com,
	masahiroy@...nel.org,
	valentina.fernandezalanis@...rochip.com,
	jassisinghbrar@...il.com,
	conor.dooley@...rochip.com
Subject: [PATCH 0/3] Add NMI Support to RISC-V via SSE

We thank Clément Léger (Rivos Inc.) for his foundational SSE
work ([1]), upon which this patch series builds. This series adds
NMI support to RISC-V via SSE, with two key focuses:
1. A PR to the RISC-V SBI spec ([2]) for unknown NMI handling, with
matching Linux kernel changes.
2. Extending NMI usage to all system scenarios where it boosts
robustness—e.g., stopping CPUs during crashes.

[1] https://lore.kernel.org/all/20250908181717.1997461-1-cleger@rivosinc.com/
[2] https://github.com/riscv-non-isa/riscv-sbi-doc/pull/223

Yunhui Cui (3):
  drivers: firmware: riscv: add SSE NMI support
  riscv: crash: move IPI crash handling logic to crash.c
  riscv: crash: use NMI to stop the CPU

 MAINTAINERS                      |   7 ++
 arch/riscv/include/asm/crash.h   |  17 ++++
 arch/riscv/include/asm/sbi.h     |   2 +
 arch/riscv/include/asm/smp.h     |  14 +++
 arch/riscv/kernel/Makefile       |   2 +-
 arch/riscv/kernel/crash.c        | 111 +++++++++++++++++++++++
 arch/riscv/kernel/smp.c          |  99 +-------------------
 drivers/firmware/riscv/Kconfig   |  10 +++
 drivers/firmware/riscv/Makefile  |   1 +
 drivers/firmware/riscv/sse_nmi.c | 150 +++++++++++++++++++++++++++++++
 include/linux/sse_nmi.h          |   8 ++
 11 files changed, 323 insertions(+), 98 deletions(-)
 create mode 100644 arch/riscv/include/asm/crash.h
 create mode 100644 arch/riscv/kernel/crash.c
 create mode 100644 drivers/firmware/riscv/sse_nmi.c
 create mode 100644 include/linux/sse_nmi.h

-- 
2.39.5