On Thu, 7 May 2020 12:00:13 +0200 (CEST)
Jiri Kosina [off-list ref] wrote:

On Wed, 29 Apr 2020, Josh Poimboeuf wrote:

quoted

From: Peter Zijlstra <peterz@infradead.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@vger.kernel.org
Cc: Heiko Carstens <redacted>
Cc: Gerald Schaefer <redacted>
Cc: Christian Borntraeger <redacted>
Suggested-by: Josh Poimboeuf <redacted>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Josh Poimboeuf <redacted>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Joe Lawrence <joe.lawrence@redhat.com>
Acked-by: Miroslav Benes <mbenes@suse.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 <redacted> # s390