linux-kernel - Re: [PATCH 0/2] Kernel Live Patching

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Message-ID: <20141106200200.GB16347@treble.redhat.com>
Date:	Thu, 6 Nov 2014 14:02:00 -0600
From:	Josh Poimboeuf <jpoimboe@...hat.com>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Christoph Hellwig <hch@...radead.org>,
	Vojtech Pavlik <vojtech@...e.cz>,
	Seth Jennings <sjenning@...hat.com>,
	Jiri Kosina <jkosina@...e.cz>, live-patching@...r.kernel.org,
	kpatch@...hat.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/2] Kernel Live Patching

On Thu, Nov 06, 2014 at 02:49:26PM -0500, Steven Rostedt wrote:
> On Thu, 6 Nov 2014 13:34:33 -0600
> Josh Poimboeuf <jpoimboe@...hat.com> wrote:
> 
> > On Thu, Nov 06, 2014 at 10:58:57AM -0800, Christoph Hellwig wrote:
> > > On Thu, Nov 06, 2014 at 07:51:57PM +0100, Vojtech Pavlik wrote:
> > > > I don't think this specific example was generated. 
> > 
> > So there are two ways to use this live patching API: using a generated
> > module (e.g., using the kpatch-build tool) or manually compiling a
> > module via kbuild.
> > 
> > Vojtech's right, the provided example was not generated.  Maybe it
> > belongs in samples/livepatch?
> > 
> 
> I understand that there is two methods in doing this. Is it possible to
> create a "simple generator" that only does the simple case. Perhaps can
> detect non simple cases where it rejects the change and tells the user
> they need to reboot.
> 
> Something that isn't really related to either kpatch or kGraft, but can
> be used for testing purposes?

For basic testing, a generator isn't needed.  You can just use kbuild to
compile a kmod from a human-created source file, a la kGraft.  For
example:

  https://github.com/spartacus06/livepatch/blob/master/patch/patch.c

-- 
Josh
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