linux-kernel - Re: [RFC 0/5] livepatch: new API to track system state changes

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Message-ID: <20190615204736.coc2gbgffahkirnz@treble>
Date:   Sat, 15 Jun 2019 15:47:36 -0500
From:   Josh Poimboeuf <jpoimboe@...hat.com>
To:     Petr Mladek <pmladek@...e.com>
Cc:     Jiri Kosina <jikos@...nel.org>, Miroslav Benes <mbenes@...e.cz>,
        Joe Lawrence <joe.lawrence@...hat.com>,
        Kamalesh Babulal <kamalesh@...ux.vnet.ibm.com>,
        Nicolai Stange <nstange@...e.de>,
        live-patching@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC 0/5] livepatch: new API to track system state changes

On Tue, Jun 11, 2019 at 03:56:22PM +0200, Petr Mladek wrote:
> Hi,
> 
> this is another piece in the puzzle that helps to maintain more
> livepatches.
> 
> Especially pre/post (un)patch callbacks might change a system state.
> Any newly installed livepatch has to somehow deal with system state
> modifications done be already installed livepatches.
> 
> This patchset provides, hopefully, a simple and generic API that
> helps to keep and pass information between the livepatches.
> It is also usable to prevent loading incompatible livepatches.
> 
> There was also a related idea to add a sticky flag. It should be
> easy to add it later. It would perfectly fit into the new struct
> klp_state.
> 
> Petr Mladek (5):
>   livepatch: Keep replaced patches until post_patch callback is called
>   livepatch: Basic API to track system state changes
>   livepatch: Allow to distinguish different version of system state
>     changes
>   livepatch: Documentation of the new API for tracking system state
>     changes
>   livepatch: Selftests of the API for tracking system state changes

I confess I missed most of the previous discussion, but from a first
read-through this seems reasonable, and the code looks simple and
self-contained.

-- 
Josh