Re: [RFC][PATCH] ftrace/x86: Emulate call function while updating in breakpoint handler

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To: Jiri Kosina <jikos@xxxxxxxxxx>
Subject: Re: [RFC][PATCH] ftrace/x86: Emulate call function while updating in breakpoint handler
From: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Date: Wed, 1 May 2019 21:41:32 +0200
Cc: Steven Rostedt <rostedt@xxxxxxxxxxx>, Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>, Andy Lutomirski <luto@xxxxxxxxxx>, Nicolai Stange <nstange@xxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>, Borislav Petkov <bp@xxxxxxxxx>, "H. Peter Anvin" <hpa@xxxxxxxxx>, the arch/x86 maintainers <x86@xxxxxxxxxx>, Josh Poimboeuf <jpoimboe@xxxxxxxxxx>, Miroslav Benes <mbenes@xxxxxxx>, Petr Mladek <pmladek@xxxxxxxx>, Joe Lawrence <joe.lawrence@xxxxxxxxxx>, Shuah Khan <shuah@xxxxxxxxxx>, Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>, Tim Chen <tim.c.chen@xxxxxxxxxxxxxxx>, Sebastian Andrzej Siewior <bigeasy@xxxxxxxxxxxxx>, Mimi Zohar <zohar@xxxxxxxxxxxxx>, Juergen Gross <jgross@xxxxxxxx>, Nick Desaulniers <ndesaulniers@xxxxxxxxxx>, Nayna Jain <nayna@xxxxxxxxxxxxx>, Masahiro Yamada <yamada.masahiro@xxxxxxxxxxxxx>, Joerg Roedel <jroedel@xxxxxxx>, Linux List Kernel Mailing <linux-kernel@xxxxxxxxxxxxxxx>, live-patching@xxxxxxxxxxxxxxx, "open list:KERNEL SELFTEST FRAMEWORK" <linux-kselftest@xxxxxxxxxxxxxxx>
In-reply-to: <nycvar.YFH.7.76.1905012132100.9803@cbobk.fhfr.pm>
User-agent: Mutt/1.10.1 (2018-07-13)

On Wed, May 01, 2019 at 09:33:28PM +0200, Jiri Kosina wrote:
> On Wed, 1 May 2019, Steven Rostedt wrote:
> 
> > I never tested the 32 bit version of this. And we could just not
> > implement it (I don't think there's live kernel patching for it
> > either).
> 
> That's correct, there is no livepatching on x86_32 (and no plans for 
> it). CONFIG_LIVEPATCH is not available for 32bit builds at all.

We still want this for static_call(), even on 32bit.

References:
- Re: [PATCH 3/4] x86/ftrace: make ftrace_int3_handler() not to skip fops invocation
  - From: Linus Torvalds
- Re: [PATCH 3/4] x86/ftrace: make ftrace_int3_handler() not to skip fops invocation
  - From: Andy Lutomirski
- Re: [PATCH 3/4] x86/ftrace: make ftrace_int3_handler() not to skip fops invocation
  - From: Steven Rostedt
- Re: [PATCH 3/4] x86/ftrace: make ftrace_int3_handler() not to skip fops invocation
  - From: Steven Rostedt
- [RFC][PATCH] ftrace/x86: Emulate call function while updating in breakpoint handler
  - From: Steven Rostedt
- Re: [RFC][PATCH] ftrace/x86: Emulate call function while updating in breakpoint handler
  - From: Linus Torvalds
- Re: [RFC][PATCH] ftrace/x86: Emulate call function while updating in breakpoint handler
  - From: Peter Zijlstra
- Re: [RFC][PATCH] ftrace/x86: Emulate call function while updating in breakpoint handler
  - From: Linus Torvalds
- Re: [RFC][PATCH] ftrace/x86: Emulate call function while updating in breakpoint handler
  - From: Steven Rostedt
- Re: [RFC][PATCH] ftrace/x86: Emulate call function while updating in breakpoint handler
  - From: Jiri Kosina

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