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

From: Joe Lawrence
Date: Fri Jun 21 2019 - 09:19:38 EST


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.
>

Thanks for posting, Petr and aplogies for not getting to this RFC
earlier. I think this strikes a reasonable balance between the (too)
"simplified" versioning scheme that I posted a few weeks back, and what
I was afraid might have been too complicated callback-state-version
concept.

This RFC reads fairly straightforward and especially easy to review
given the included documentation and self-tests. I'll add a few
comments per patch, but again, I like how this came out.

> 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.

I think so, too. It would indicate that the patch is introducing a
state which cannot be safely unloaded. But we can talk about that at a
later time if/when we want to add that wrinkle to klp_state.

-- Joe