linux-kernel - Re: [PATCH 1/1] livepatch: add support on s390

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Date:	Fri, 27 Mar 2015 10:29:28 +0100 (CET)
From:	Jiri Kosina <jkosina@...e.cz>
To:	Heiko Carstens <heiko.carstens@...ibm.com>
cc:	Jiri Slaby <jslaby@...e.cz>, jpoimboe@...hat.com,
	sjenning@...hat.com, vojtech@...e.cz,
	live-patching@...r.kernel.org, linux-s390@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] livepatch: add support on s390

On Fri, 27 Mar 2015, Heiko Carstens wrote:

> On Thu, Mar 26, 2015 at 07:24:58PM +0100, Jiri Kosina wrote:
> > On Thu, 26 Mar 2015, Jiri Slaby wrote:
> > 
> > > This is a trivial port from kGraft. Module relocations are not
> > > supported.
> > > 
> > > Signed-off-by: Jiri Slaby <jslaby@...e.cz>
> > > ---
> > > [v2] return ENOSYS
> > > [v3] proper return value from klp_check_compiler_support
> > 
> > Applied to for-4.1/core.
> 
> Hello Jiri,
> 
> while I do appreciate your work on the s390 architecture backend for
> livepatching:  this should go upstream only via the s390 tree or with
> an Ack from Martin or me.

Fair enough; I merged it because I was convinced that we have your Ack for 
the very same patch in our tree for kGraft, but now that I look again, we 
apparently don't. So sorry for that. What is your standpoint on this one 
then, please?

> That being said, what is the reason why module relocations are not
> supported?

That's an addon feature that can be added gradually, it's not crucial for 
basic functionality. Basically: someone has to write the code, but it's 
useful even without it.

> As far as I can tell right now there is only one simple in-kernel test 
> case available (which is fine). However is the tool chain to generate 
> additional livepatch modules, available somewhere? If so, where?

For the current feature set of livepatching as-is upstream, no tooling is 
really hard requirement and the patches are to be written by hand (exactly 
as the one in the samples/ directory).

Thanks,

-- 
Jiri Kosina
SUSE Labs
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