93862e385d
Provide livepatch modules a klp_object (un)patching notification
mechanism. Pre and post-(un)patch callbacks allow livepatch modules to
setup or synchronize changes that would be difficult to support in only
patched-or-unpatched code contexts.
Callbacks can be registered for target module or vmlinux klp_objects,
but each implementation is klp_object specific.
- Pre-(un)patch callbacks run before any (un)patching transition
starts.
- Post-(un)patch callbacks run once an object has been (un)patched and
the klp_patch fully transitioned to its target state.
Example use cases include modification of global data and registration
of newly available services/handlers.
See Documentation/livepatch/callbacks.txt for details and
samples/livepatch/ for examples.
Signed-off-by: Joe Lawrence <joe.lawrence@redhat.com>
Acked-by: Josh Poimboeuf <jpoimboe@redhat.com>
Acked-by: Miroslav Benes <mbenes@suse.cz>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
44 lines
940 B
C
44 lines
940 B
C
#ifndef _LIVEPATCH_CORE_H
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#define _LIVEPATCH_CORE_H
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#include <linux/livepatch.h>
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extern struct mutex klp_mutex;
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static inline bool klp_is_object_loaded(struct klp_object *obj)
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{
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return !obj->name || obj->mod;
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}
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static inline int klp_pre_patch_callback(struct klp_object *obj)
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{
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int ret;
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ret = (obj->callbacks.pre_patch) ?
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(*obj->callbacks.pre_patch)(obj) : 0;
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obj->callbacks.post_unpatch_enabled = !ret;
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return ret;
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}
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static inline void klp_post_patch_callback(struct klp_object *obj)
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{
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if (obj->callbacks.post_patch)
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(*obj->callbacks.post_patch)(obj);
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}
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static inline void klp_pre_unpatch_callback(struct klp_object *obj)
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{
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if (obj->callbacks.pre_unpatch)
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(*obj->callbacks.pre_unpatch)(obj);
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}
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static inline void klp_post_unpatch_callback(struct klp_object *obj)
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{
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if (obj->callbacks.post_unpatch_enabled &&
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obj->callbacks.post_unpatch)
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(*obj->callbacks.post_unpatch)(obj);
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}
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#endif /* _LIVEPATCH_CORE_H */
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