linux-kernel - Re: [PATCH v6 1/3] livepatch: add (un)patch callbacks

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Message-ID: <alpine.LSU.2.21.1710181504360.8638@san.suse.cz>
Date:   Wed, 18 Oct 2017 15:05:51 +0200 (CEST)
From:   Miroslav Benes <mbenes@...e.cz>
To:     Joe Lawrence <joe.lawrence@...hat.com>
cc:     live-patching@...r.kernel.org, linux-kernel@...r.kernel.org,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Jessica Yu <jeyu@...nel.org>, Jiri Kosina <jikos@...nel.org>,
        Petr Mladek <pmladek@...e.com>,
        Chris J Arges <chris.j.arges@...onical.com>
Subject: Re: [PATCH v6 1/3] livepatch: add (un)patch callbacks

On Fri, 13 Oct 2017, Joe Lawrence wrote:

> Provide livepatch modules a klp_object (un)patching notification
> mechanism.  Pre and post-(un)patch callbacks allow livepatch modules to
> setup or synchronize changes that would be difficult to support in only
> patched-or-unpatched code contexts.
> 
> Callbacks can be registered for target module or vmlinux klp_objects,
> but each implementation is klp_object specific.
> 
>   - Pre-(un)patch callbacks run before any (un)patching transition
>     starts.
> 
>   - Post-(un)patch callbacks run once an object has been (un)patched and
>     the klp_patch fully transitioned to its target state.
> 
> Example use cases include modification of global data and registration
> of newly available services/handlers.
> 
> See Documentation/livepatch/callbacks.txt for details and
> samples/livepatch/ for examples.
> 
> Signed-off-by: Joe Lawrence <joe.lawrence@...hat.com>

Acked-by: Miroslav Benes <mbenes@...e.cz>

Miroslav