linux-kernel - Re: [PATCH] livepatch: add (un)patch hooks

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Date:   Thu, 27 Jul 2017 16:43:58 -0400
From:   Joe Lawrence <joe.lawrence@...hat.com>
To:     Josh Poimboeuf <jpoimboe@...hat.com>,
        Petr Mladek <pmladek@...e.com>
Cc:     live-patching@...r.kernel.org, linux-kernel@...r.kernel.org,
        Jessica Yu <jeyu@...nel.org>, Jiri Kosina <jikos@...nel.org>,
        Miroslav Benes <mbenes@...e.cz>,
        Chris J Arges <chris.j.arges@...onical.com>
Subject: Re: [PATCH] livepatch: add (un)patch hooks

On 07/20/2017 12:17 AM, Josh Poimboeuf wrote:
> - The pre-patch and pre-unpatch hooks can be run before the
>   patching/unpatching process begins.

Hi Josh,

By "(un)patching process" are you referring to the klp_patch at large or
each klp_object?  ie, would all klp_objects execute their hooks before
anything is (un)patched?  Just trying to clarify.

> - The post-patch and post-unpatch hooks will need to be run from either
>   klp_complete_transition() or klp_module_coming/going(), depending on
>   whether the to-be-patched module is already loaded or is being
>   loaded/unloaded.

You're suggesting that post-(un)patch-hooks:

  1 - Notify klp_objects when a KLP_(UN)PATCHED transition completes

and for subsequently loaded klp_objects (ie modules):

  2 - On load - notify it with current KLP_(UN)PATCHED state,
      Steady state - same as (1) above.

Thanks,

-- Joe