linux-kernel - Re: [PATCH v3 8/8] x86/ftrace: enable EXECMEM_ROX

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Message-ID: <20250714122243.19c9ab59@batman.local.home>
Date: Mon, 14 Jul 2025 12:22:43 -0400
From: Steven Rostedt <rostedt@...dmis.org>
To: Mike Rapoport <rppt@...nel.org>
Cc: Andrew Morton <akpm@...ux-foundation.org>, Andy Lutomirski
 <luto@...nel.org>, Borislav Petkov <bp@...en8.de>, Christophe Leroy
 <christophe.leroy@...roup.eu>, Daniel Gomez <da.gomez@...sung.com>, Dave
 Hansen <dave.hansen@...ux.intel.com>, Ingo Molnar <mingo@...hat.com>, "Liam
 R. Howlett" <Liam.Howlett@...cle.com>, Luis Chamberlain
 <mcgrof@...nel.org>, Mark Rutland <mark.rutland@....com>, Masami Hiramatsu
 <mhiramat@...nel.org>, "H. Peter Anvin" <hpa@...or.com>, Peter Zijlstra
 <peterz@...radead.org>, Petr Pavlu <petr.pavlu@...e.com>, Sami Tolvanen
 <samitolvanen@...gle.com>, Thomas Gleixner <tglx@...utronix.de>, Yann
 Ylavic <ylavic.dev@...il.com>, linux-kernel@...r.kernel.org,
 linux-mm@...ck.org, linux-modules@...r.kernel.org,
 linux-trace-kernel@...r.kernel.org, x86@...nel.org
Subject: Re: [PATCH v3 8/8] x86/ftrace: enable EXECMEM_ROX_CACHE for ftrace
 allocations

On Sun, 13 Jul 2025 10:17:30 +0300
Mike Rapoport <rppt@...nel.org> wrote:

> From: "Mike Rapoport (Microsoft)" <rppt@...nel.org>
> 
> For the most part ftrace uses text poking and can handle ROX memory.
> The only place that requires writable memory is create_trampoline() that
> updates the allocated memory and in the end makes it ROX.
> 
> Use execmem_alloc_rw() in x86::ftrace::alloc_tramp() and enable ROX cache
> for EXECMEM_FTRACE when configuration and CPU features allow that.
> 
> Acked-by: Peter Zijlstra (Intel) <peterz@...radead.org>
> Signed-off-by: Mike Rapoport (Microsoft) <rppt@...nel.org>

Acked-by: Steven Rostedt (Google) <rostedt@...dmis.org>

-- Steve