Hi,
This is v6 of the RISC-V reliable stack unwinding series for livepatch.
Wang Han has left our team, so I am taking over this series from now on.
The series adds explicit frame-record metadata, preserves the frame
pointer through dynamic ftrace, and replaces the open-coded stack walker
with a conservative frame-pointer based unwinder. It then enables the
RISC-V livepatch capability and adds the syscall-wrapper selftest prefix.
Changes since v5:
* Rebase onto the current riscv/for-next; no functional changes.
* Fold in the tags collected from the v5 thread:
- Reviewed-by: Shuai Xue on 2/7, 3/7, 4/7 and 6/7
- Acked-by: Miroslav Benes on 7/7
* Add my sign-off as the new sender.
Since the patches are otherwise identical to v5, the v5 validation
results still apply. For reference, from the v5 cover letter:
* Built Linux 7.2.0-rc6 with riscv64-unknown-linux-gnu-gcc 15.2.0
and binutils 2.46.
* Standard livepatch configuration built successfully, including
Image, vmlinux, modules, compile_commands.json and GDB scripts.
* CONFIG_IRQ_STACKS=n variant linked successfully with GCC.
* QEMU 8.2.2, 1 CPU: livepatch selftests PASS: 7, SKIP: 1,
FAIL: 0; ftrace function graph 3 passed, 0 failed, 3 unsupported.
* QEMU 8.2.2, 4 CPUs: livepatch selftests PASS: 7, SKIP: 1,
FAIL: 0; ftrace function graph 3 passed, 0 failed, 3 unsupported.
* No BUG, WARNING, Oops, panic, unreliable stack or Call Trace found
by the validation log scans. Expected negative livepatch errors are
part of the selftests.
v5 was posted in early August and has been quiet since then. I would
appreciate it if the series could be considered for the upcoming merge
window. Happy to address any remaining feedback.
Base:
riscv/for-next 77ae27fd98f3 ("Merge tag 'printk-for-7.3' of
git://git.kernel.org/pub/scm/linux/kernel/git/printk/linux")
Previous versions:
v5: https://lore.kernel.org/r/[email protected]
v4 RESEND:
https://lore.kernel.org/r/[email protected]
v3:
https://lore.kernel.org/r/[email protected]
v2: https://lore.kernel.org/r/[email protected]
v1: https://lore.kernel.org/r/[email protected]
Assisted-by: Qoder:Qwen-3.8-MAX-Preview
Wang Han (7):
riscv: stacktrace: Add frame record metadata
riscv: stacktrace: disable KASAN and KCOV instrumentation for
stacktrace.o
riscv: ftrace: always preserve s0 in dynamic ftrace register frame
riscv: stacktrace: introduce stack-bound tracking helpers
riscv: stacktrace: switch to frame-pointer based unwinder
riscv: Kconfig: enable HAVE_RELIABLE_STACKTRACE and HAVE_LIVEPATCH
selftests/livepatch: Add RISC-V syscall wrapper prefix
arch/riscv/Kconfig | 4 +
arch/riscv/include/asm/ptrace.h | 9 +
arch/riscv/include/asm/stacktrace.h | 67 ++-
arch/riscv/include/asm/stacktrace/common.h | 159 +++++
arch/riscv/include/asm/stacktrace/frame.h | 53 ++
arch/riscv/kernel/Makefile | 6 +
arch/riscv/kernel/asm-offsets.c | 6 +
arch/riscv/kernel/entry.S | 39 +-
arch/riscv/kernel/ftrace.c | 6 +-
arch/riscv/kernel/head.S | 23 +
arch/riscv/kernel/mcount-dyn.S | 4 -
arch/riscv/kernel/perf_callchain.c | 2 +-
arch/riscv/kernel/process.c | 33 +-
arch/riscv/kernel/stacktrace.c | 561 +++++++++++++++---
.../livepatch/test_modules/test_klp_syscall.c | 2 +
15 files changed, 868 insertions(+), 106 deletions(-)
create mode 100644 arch/riscv/include/asm/stacktrace/common.h
create mode 100644 arch/riscv/include/asm/stacktrace/frame.h
base-commit: 77ae27fd98f3b9ab376239051ec7f9ee34c2c072
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2.39.3
