linux-kernel - [PATCH v2 0/6] riscv: vector: misc ptrace fixes for debug use-cases

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Message-ID: <20251007115840.2320557-1-geomatsi@gmail.com>
Date: Tue,  7 Oct 2025 14:58:16 +0300
From: Sergey Matyukevich <geomatsi@...il.com>
To: linux-riscv@...ts.infradead.org,
	linux-kselftest@...r.kernel.org
Cc: linux-kernel@...r.kernel.org,
	Paul Walmsley <pjw@...nel.org>,
	Palmer Dabbelt <palmer@...belt.com>,
	Albert Ou <aou@...s.berkeley.edu>,
	Alexandre Ghiti <alex@...ti.fr>,
	Oleg Nesterov <oleg@...hat.com>,
	Shuah Khan <shuah@...nel.org>,
	Jisheng Zhang <jszhang@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Thomas Huth <thuth@...hat.com>,
	Charlie Jenkins <charlie@...osinc.com>,
	Andy Chiu <andybnac@...il.com>,
	Han Gao <rabenda.cn@...il.com>,
	Samuel Holland <samuel.holland@...ive.com>,
	Nam Cao <namcao@...utronix.de>,
	Joel Granados <joel.granados@...nel.org>,
	Clément Léger <cleger@...osinc.com>,
	Conor Dooley <conor.dooley@...rochip.com>,
	Sergey Matyukevich <geomatsi@...il.com>
Subject: [PATCH v2 0/6] riscv: vector: misc ptrace fixes for debug use-cases

This patch series suggests fixes for several corner cases in the RISC-V
vector ptrace implementation:

- follow gdbserver expectations and return ENODATA instead of EINVAL if vector
  extension is supported but not yet activated for a traced process

- force vector context save on the next context switch after ptrace call that
  modified vector CSRs, to avoid reading stale values by the next ptrace calls

- force vector context save on the first context switch after vector context
  initialization, to avoid reading zero vlenb by an early attached debugger

For detailed description see the appropriate commit messages. A new test is
added into the tools/testing/selftests/riscv/vector to verify the fixes.
Each fix is accompanied by its own test case.

Initial version [1] of this series included only the last fix for zero vlenb.

[1] https://lore.kernel.org/linux-riscv/20250821173957.563472-1-geomatsi@gmail.com/T/#u


Ilya Mamay (1):
  riscv: ptrace: return ENODATA for inactive vector extension

Sergey Matyukevich (5):
  selftests: riscv: test ptrace vector interface
  selftests: riscv: set invalid vtype using ptrace
  riscv: vector: allow to force vector context save
  selftests: riscv: verify initial vector state with ptrace
  riscv: vector: initialize vlenb on the first context switch

 arch/riscv/include/asm/thread_info.h          |   2 +
 arch/riscv/include/asm/vector.h               |   3 +
 arch/riscv/kernel/process.c                   |   2 +
 arch/riscv/kernel/ptrace.c                    |  15 +-
 arch/riscv/kernel/vector.c                    |   4 +
 .../testing/selftests/riscv/vector/.gitignore |   1 +
 tools/testing/selftests/riscv/vector/Makefile |   5 +-
 .../testing/selftests/riscv/vector/v_ptrace.c | 302 ++++++++++++++++++
 8 files changed, 331 insertions(+), 3 deletions(-)
 create mode 100644 tools/testing/selftests/riscv/vector/v_ptrace.c


base-commit: c746c3b5169831d7fb032a1051d8b45592ae8d78
-- 
2.51.0