linux-kernel - Re: [PATCH 8/8] arm64: Enable livepatch for ARM64

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Message-ID: <20250203101617.5300f930@gandalf.local.home>
Date: Mon, 3 Feb 2025 10:16:17 -0500
From: Steven Rostedt <rostedt@...dmis.org>
To: Prasanna Kumar T S M <ptsm@...ux.microsoft.com>
Cc: Weinan Liu <wnliu@...gle.com>, Josh Poimboeuf <jpoimboe@...nel.org>,
 Indu Bhagat <indu.bhagat@...cle.com>, Peter Zijlstra
 <peterz@...radead.org>, Mark Rutland <mark.rutland@....com>,
 roman.gushchin@...ux.dev, Will Deacon <will@...nel.org>, Ian Rogers
 <irogers@...gle.com>, linux-toolchains@...r.kernel.org,
 linux-kernel@...r.kernel.org, live-patching@...r.kernel.org,
 joe.lawrence@...hat.com, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 8/8] arm64: Enable livepatch for ARM64

On Fri, 31 Jan 2025 21:38:46 +0530
Prasanna Kumar T S M <ptsm@...ux.microsoft.com> wrote:

> > --- a/arch/arm64/Kconfig
> > +++ b/arch/arm64/Kconfig
> > @@ -271,6 +271,8 @@ config ARM64
> >   	select HAVE_SOFTIRQ_ON_OWN_STACK
> >   	select USER_STACKTRACE_SUPPORT
> >   	select VDSO_GETRANDOM
> > +	select HAVE_RELIABLE_STACKTRACE if SFRAME_UNWINDER
> > +	select HAVE_LIVEPATCH		if HAVE_DYNAMIC_FTRACE_WITH_ARGS && HAVE_RELIABLE_STACKTRACE
> >   	help
> >   	  ARM 64-bit (AArch64) Linux support.
> >   
> > @@ -2498,3 +2500,4 @@ source "drivers/acpi/Kconfig"
> >   
> >   source "arch/arm64/kvm/Kconfig"
> >   
> > +source "kernel/livepatch/Kconfig"  
> 
> Will this work for ftrace'd (kprobe'd) function as well?

What work? The stack walker? It may require updates to the tracing
trampolines, but it should be doable just like ORC is.

-- Steve