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Message-Id: <169124746774.186149.2326708176801468806.stgit@devnote2>
Date: Sat, 5 Aug 2023 23:57:47 +0900
From: "Masami Hiramatsu (Google)" <mhiramat@...nel.org>
To: Alexei Starovoitov <alexei.starovoitov@...il.com>,
Steven Rostedt <rostedt@...dmis.org>,
Florent Revest <revest@...omium.org>
Cc: linux-trace-kernel@...r.kernel.org,
LKML <linux-kernel@...r.kernel.org>,
Martin KaFai Lau <martin.lau@...ux.dev>,
bpf <bpf@...r.kernel.org>, Sven Schnelle <svens@...ux.ibm.com>,
Alexei Starovoitov <ast@...nel.org>,
Jiri Olsa <jolsa@...nel.org>,
Arnaldo Carvalho de Melo <acme@...nel.org>,
Daniel Borkmann <daniel@...earbox.net>,
Alan Maguire <alan.maguire@...cle.com>,
Mark Rutland <mark.rutland@....com>,
Peter Zijlstra <peterz@...radead.org>,
Thomas Gleixner <tglx@...utronix.de>
Subject: [RFC PATCH 0/5] bpf: fprobe: rethook: Use ftrace_regs instead of pt_regs
Hi,
Here is RFC series to use ftrace_regs instead of pt_regs. But this includes
the generic part and minimum modifications of arch dependent code. (e.g. not
including rethook for arm64.) This series is based on the discussion at
https://lore.kernel.org/all/20230801112036.0d4ee60d@gandalf.local.home/
This has 5 patches,
- Simply replace pt_regs in fprobe_entry_handler with ftrace_regs.
- Replace pt_regs in rethook and fprobe_exit_handler with ftrace_regs. This
introduce a new HAVE_PT_REGS_COMPAT_FTRACE_REGS which means ftrace_regs is
just a wrapper of pt_regs (except for arm64, other architectures do this)
- Update fprobe-events to use ftrace_regs natively.
- Introduce ftrace_partial_regs(). (This changes ARM64 which needs a custom
implementation)
- Update bpf multi-kprobe handler use ftrace_partial_regs().
Florent, feel free to add your rethook for arm64, but please do not remove
kretprobe trampoline yet. It is another discussion point. We may be possible
to use ftrace_regs for kretprobe by ftrace_partial_regs() but kretprobe
allows nest probe. (maybe we can skip that case?)
Thank you,
---
Masami Hiramatsu (Google) (5):
fprobe: Use fprobe_regs in fprobe entry handler
fprobe: rethook: Use fprobe_regs in fprobe exit handler and rethook
tracing/fprobe: Enable fprobe events with CONFIG_DYNAMIC_FTRACE_WITH_ARGS
ftrace: Add ftrace_partial_regs() for converting ftrace_regs to pt_regs
bpf: Enable kprobe_multi feature if CONFIG_FPROBE is enabled
arch/Kconfig | 1 +
arch/arm64/include/asm/ftrace.h | 11 ++++++
arch/loongarch/Kconfig | 1 +
arch/s390/Kconfig | 1 +
arch/x86/Kconfig | 1 +
arch/x86/kernel/rethook.c | 9 +++--
include/linux/fprobe.h | 4 +-
include/linux/ftrace.h | 11 ++++++
include/linux/rethook.h | 11 +++---
kernel/kprobes.c | 9 ++++-
kernel/trace/Kconfig | 9 ++++-
kernel/trace/bpf_trace.c | 14 +++++--
kernel/trace/fprobe.c | 8 ++--
kernel/trace/rethook.c | 16 ++++----
kernel/trace/trace_fprobe.c | 76 ++++++++++++++++++++++++---------------
kernel/trace/trace_probe_tmpl.h | 2 +
lib/test_fprobe.c | 10 +++--
samples/fprobe/fprobe_example.c | 4 +-
18 files changed, 130 insertions(+), 68 deletions(-)
--
Masami Hiramatsu (Google) <mhiramat@...nel.org>
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