linux-kernel - Re: [PATCH v4 06/11] s390/module: Use s390_kernel

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Date:   Thu, 7 May 2020 14:27:44 +0200
From:   Gerald Schaefer <gerald.schaefer@...ibm.com>
To:     Jiri Kosina <jikos@...nel.org>
Cc:     Josh Poimboeuf <jpoimboe@...hat.com>,
        live-patching@...r.kernel.org, linux-kernel@...r.kernel.org,
        Peter Zijlstra <peterz@...radead.org>,
        Jessica Yu <jeyu@...nel.org>,
        Joe Lawrence <joe.lawrence@...hat.com>,
        Miroslav Benes <mbenes@...e.cz>, linux-s390@...r.kernel.org,
        Heiko Carstens <heiko.carstens@...ibm.com>,
        Christian Borntraeger <borntraeger@...ibm.com>,
        Gerald Schaefer <gerald.schaefer@...ibm.com>
Subject: Re: [PATCH v4 06/11] s390/module: Use s390_kernel_write() for late
 relocations

On Thu, 7 May 2020 12:00:13 +0200 (CEST)
Jiri Kosina <jikos@...nel.org> wrote:

> On Wed, 29 Apr 2020, Josh Poimboeuf wrote:
> 
> > From: Peter Zijlstra <peterz@...radead.org>
> > 
> > Because of late module patching, a livepatch module needs to be able to
> > apply some of its relocations well after it has been loaded.  Instead of
> > playing games with module_{dis,en}able_ro(), use existing text poking
> > mechanisms to apply relocations after module loading.
> > 
> > So far only x86, s390 and Power have HAVE_LIVEPATCH but only the first
> > two also have STRICT_MODULE_RWX.
> > 
> > This will allow removal of the last module_disable_ro() usage in
> > livepatch.  The ultimate goal is to completely disallow making
> > executable mappings writable.
> > 
> > [ jpoimboe: Split up patches.  Use mod state to determine whether
> > 	    memcpy() can be used.  Test and add fixes. ]
> > 
> > Cc: linux-s390@...r.kernel.org
> > Cc: Heiko Carstens <heiko.carstens@...ibm.com>
> > Cc: Gerald Schaefer <gerald.schaefer@...ibm.com>
> > Cc: Christian Borntraeger <borntraeger@...ibm.com>
> > Suggested-by: Josh Poimboeuf <jpoimboe@...hat.com>
> > Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
> > Signed-off-by: Josh Poimboeuf <jpoimboe@...hat.com>
> > Acked-by: Peter Zijlstra (Intel) <peterz@...radead.org>
> > Acked-by: Joe Lawrence <joe.lawrence@...hat.com>
> > Acked-by: Miroslav Benes <mbenes@...e.cz>
> 
> Could we please get an Ack / Reviewed-by: for this patch from s390 folks?
> 
> Thanks,
> 

Looks pretty straightforward, and using s390_kernel_write() is OK, so

Acked-by: Gerald Schaefer <gerald.schaefer@...ibm.com> # s390