linux-kernel - Re: [PATCH perf/core 08/22] uprobes/x86: Add mapping for optimized uprobe trampolines

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Message-ID: <CAEf4BzbBykRTQJxNLYN5zXzdK+xMMzNT9LCRp3+N7R2=+xbLZw@mail.gmail.com>
Date: Tue, 22 Apr 2025 16:51:19 -0700
From: Andrii Nakryiko <andrii.nakryiko@...il.com>
To: Jiri Olsa <jolsa@...nel.org>
Cc: Oleg Nesterov <oleg@...hat.com>, Peter Zijlstra <peterz@...radead.org>, 
	Andrii Nakryiko <andrii@...nel.org>, bpf@...r.kernel.org, linux-kernel@...r.kernel.org, 
	linux-trace-kernel@...r.kernel.org, x86@...nel.org, 
	Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>, 
	John Fastabend <john.fastabend@...il.com>, Hao Luo <haoluo@...gle.com>, 
	Steven Rostedt <rostedt@...dmis.org>, Masami Hiramatsu <mhiramat@...nel.org>, 
	Alan Maguire <alan.maguire@...cle.com>, David Laight <David.Laight@...lab.com>, 
	Thomas Weißschuh <thomas@...ch.de>, 
	Ingo Molnar <mingo@...nel.org>
Subject: Re: [PATCH perf/core 08/22] uprobes/x86: Add mapping for optimized
 uprobe trampolines

On Mon, Apr 21, 2025 at 2:46 PM Jiri Olsa <jolsa@...nel.org> wrote:
>
> Adding support to add special mapping for for user space trampoline

for for

> with following functions:
>
>   uprobe_trampoline_get - find or add uprobe_trampoline
>   uprobe_trampoline_put - remove or destroy uprobe_trampoline
>
> The user space trampoline is exported as arch specific user space special
> mapping through tramp_mapping, which is initialized in following changes
> with new uprobe syscall.
>
> The uprobe trampoline needs to be callable/reachable from the probed address,
> so while searching for available address we use is_reachable_by_call function
> to decide if the uprobe trampoline is callable from the probe address.
>
> All uprobe_trampoline objects are stored in uprobes_state object and are
> cleaned up when the process mm_struct goes down. Adding new arch hooks
> for that, because this change is x86_64 specific.
>
> Locking is provided by callers in following changes.
>
> Signed-off-by: Jiri Olsa <jolsa@...nel.org>
> ---
>  arch/x86/kernel/uprobes.c | 131 ++++++++++++++++++++++++++++++++++++++
>  include/linux/uprobes.h   |   6 ++
>  kernel/events/uprobes.c   |  10 +++
>  kernel/fork.c             |   1 +
>  4 files changed, 148 insertions(+)
>

Acked-by: Andrii Nakryiko <andrii@...nel.org>

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