linux-kernel - Re: [PATCH v4 00/11] livepatch,module: Remove .klp.arch and module_disable

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Message-ID: <nycvar.YFH.7.76.2005050019060.19713@cbobk.fhfr.pm>
Date:   Tue, 5 May 2020 00:20:34 +0200 (CEST)
From:   Jiri Kosina <jikos@...nel.org>
To:     Josh Poimboeuf <jpoimboe@...hat.com>
cc:     live-patching@...r.kernel.org, linux-kernel@...r.kernel.org,
        Peter Zijlstra <peterz@...radead.org>,
        Jessica Yu <jeyu@...nel.org>,
        Joe Lawrence <joe.lawrence@...hat.com>,
        Miroslav Benes <mbenes@...e.cz>
Subject: Re: [PATCH v4 00/11] livepatch,module: Remove .klp.arch and
 module_disable_ro()

On Wed, 29 Apr 2020, Josh Poimboeuf wrote:

> v4:
> - Fixed rebase bisection regression [Miroslav]
> - Made module_enable_ro() static [Jessica]
> - Added Acked-by's
> 
> v3:
> - klp: split klp_write_relocations() into object/section specific
>   functions [joe]
> - s390: fix plt/got writes [joe]
> - s390: remove text_mutex usage [mbenes]
> - x86: do text_poke_sync() before releasing text_mutex [peterz]
> - split x86 text_mutex changes into separate patch [mbenes]
> 
> v2:
> - add vmlinux.ko check [peterz]
> - remove 'klp_object' forward declaration [mbenes]
> - use text_mutex [jeyu]
> - fix documentation TOC [jeyu]
> - fix s390 issues [mbenes]
> - upstream kpatch-build now supports this
>   (though it's only enabled for Linux >= 5.8)
> 
> These patches add simplifications and improvements for some issues Peter
> found six months ago, as part of his non-writable text code (W^X)
> cleanups.
> 
> Highlights:
> 
> - Remove the livepatch arch-specific .klp.arch sections, which were used
>   to do paravirt patching and alternatives patching for livepatch
>   replacement code.
> 
> - Add support for jump labels in patched code (only for static keys
>   which live in vmlinux).
> 
> - Remove the last module_disable_ro() usage.
> 
> For more background, see this thread:
> 
>   https://lkml.kernel.org/r/20191021135312.jbbxsuipxldocdjk@treble
> 
> This has been tested with kpatch-build integration tests and klp-convert
> selftests.

So I think this should best go through livepatching.git for 5.8. Unless 
anyone has a better idea or objects heavily, I'll queue it tomorrow.

Thanks,

-- 
Jiri Kosina
SUSE Labs