linux-kernel - Re: [RFC PATCH v4 0/6] (mostly) Arch-independent livepatch

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Date:	Tue, 9 Feb 2016 16:56:30 +0100
From:	Petr Mladek <pmladek@...e.com>
To:	Jessica Yu <jeyu@...hat.com>
Cc:	Rusty Russell <rusty@...tcorp.com.au>,
	Josh Poimboeuf <jpoimboe@...hat.com>,
	Seth Jennings <sjenning@...hat.com>,
	Jiri Kosina <jikos@...nel.org>,
	Vojtech Pavlik <vojtech@...e.com>,
	Jonathan Corbet <corbet@....net>,
	Miroslav Benes <mbenes@...e.cz>, linux-api@...r.kernel.org,
	live-patching@...r.kernel.org, x86@...nel.org,
	linux-kernel@...r.kernel.org, linux-s390@...r.kernel.org,
	linux-doc@...r.kernel.org
Subject: Re: [RFC PATCH v4 0/6] (mostly) Arch-independent livepatch

On Wed 2016-02-03 20:11:05, Jessica Yu wrote:
> This patchset removes livepatch's need for architecture-specific relocation
> code by leveraging existing code in the module loader to perform
> arch-dependent work. Specifically, instead of duplicating code and
> re-implementing what the apply_relocate_add() function in the module loader
> already does in livepatch's klp_write_module_reloc(), we reuse
> apply_relocate_add() to write relocations. The hope is that this will make
> livepatch more easily portable to other architectures and greatly reduce
> the amount of arch-specific code required to port livepatch to a particular
> architecture.
> 
> Jessica Yu (6):
>   Elf: add livepatch-specific Elf constants
>   module: s390: keep mod_arch_specific for livepatch modules
>   samples: livepatch: mark as livepatch module
>   Documentation: livepatch: outline Elf format and requirements for
>     patch modules

For the four above patches:

Reviewed-by: Petr Mladek <pmladek@...e.com>


>   module: preserve Elf information for livepatch modules
>   livepatch: reuse module loader code to write relocations

These two still need some tweaking.

I think that we are getting close. I like the way we go.
The documentation is excellent.

Thanks a lot for working on it.

Best Regards,
Petr