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Date: Fri, 28 Jul 2017 13:25:21 -0400 From: Joe Lawrence <joe.lawrence@...hat.com> To: live-patching@...r.kernel.org, linux-kernel@...r.kernel.org Cc: Josh Poimboeuf <jpoimboe@...hat.com>, Jessica Yu <jeyu@...hat.com>, Jiri Kosina <jikos@...nel.org>, Miroslav Benes <mbenes@...e.cz>, Petr Mladek <pmladek@...e.com> Subject: [PATCH v3] livepatch: shadow variables Hi all, This is v3 of the livepatch shadow variable API. v2 collected a bunch of great feedback on terminology, use cases and concurrency notes which I've tried to incorporate here. Here's a high-level sketch of v2 changes: - Overall - Squash into a one patch, makes for finding terms and code across docs/implementation/example easier - Variable naming: - obj, original data -> obj, parent object - num, numerical description of new data -> id, data identifier - new_data -> data - new_size -> size - Documentation - API summary: s/klp_shadow_detach/klp_shadow_detach_all - describe uses for the data id (versions, class/type, etc) - clarify that shadow data is a copy - fix use-cases - use one upstream commit and steal Petr's example for klp_shadow_get_or_attach() - Implementation - Modify klp_shadow_get_or_attach() to WARN and return NULL if shadow variable already exists - Add klp_shadow_update_or_attach() to update if shadow variable already exists - Sample modules - s/_thread/_work_func - use system workqueue, DECLARE_DELAYED_WORK - use XXX_PERIOD constants - overhaul usage/comments, drop the verbose dmesg logs Joe Lawrence (1): livepatch: introduce shadow variable API Documentation/livepatch/shadow-vars.txt | 217 +++++++++++++++++ include/linux/livepatch.h | 10 + kernel/livepatch/Makefile | 2 +- kernel/livepatch/shadow.c | 383 ++++++++++++++++++++++++++++++ samples/Kconfig | 5 +- samples/livepatch/Makefile | 3 + samples/livepatch/livepatch-shadow-mod.c | 222 +++++++++++++++++ samples/livepatch/livepatch-shadow-fix1.c | 174 ++++++++++++++ samples/livepatch/livepatch-shadow-fix2.c | 167 +++++++++++++ 9 files changed, 1179 insertions(+), 4 deletions(-) create mode 100644 Documentation/livepatch/shadow-vars.txt create mode 100644 kernel/livepatch/shadow.c create mode 100644 samples/livepatch/livepatch-shadow-mod.c create mode 100644 samples/livepatch/livepatch-shadow-fix1.c create mode 100644 samples/livepatch/livepatch-shadow-fix2.c -- 1.8.3.1
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