[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [xen staging] xen/livepatch: group and document payload hooks
commit 54fd7b997470e6686667ca8e18f9ba6139efcdea Author: Roger Pau Monné <roger.pau@xxxxxxxxxx> AuthorDate: Tue Feb 27 12:25:28 2024 +0100 Commit: Andrew Cooper <andrew.cooper3@xxxxxxxxxx> CommitDate: Wed Feb 28 16:57:25 2024 +0000 xen/livepatch: group and document payload hooks Group the payload hooks between the pre/post handlers, and the apply/revert replacements. Also attempt to comment the context in which the hooks are executed. No functional change. Signed-off-by: Roger Pau Monné <roger.pau@xxxxxxxxxx> Reviewed-by: Ross Lagerwall <ross.lagerwall@xxxxxxxxxx> --- xen/include/xen/livepatch_payload.h | 37 +++++++++++++++++++++++++++++-------- 1 file changed, 29 insertions(+), 8 deletions(-) diff --git a/xen/include/xen/livepatch_payload.h b/xen/include/xen/livepatch_payload.h index b9cd4f2096..472d6a4a63 100644 --- a/xen/include/xen/livepatch_payload.h +++ b/xen/include/xen/livepatch_payload.h @@ -82,6 +82,8 @@ struct payload { * collision. Since multiple hooks can be registered, the * .livepatch.hook.load section is a table of functions that will be * executed in series by the livepatch infrastructure at patch load time. + * + * Note the load hook is executed in quiesced context. */ #define LIVEPATCH_LOAD_HOOK(_fn) \ livepatch_loadcall_t *__weak \ @@ -96,14 +98,20 @@ struct payload { livepatch_unloadcall_t *__weak \ const livepatch_unload_data_##_fn __section(".livepatch.hooks.unload") = _fn; +/* + * Pre/Post action hooks. + * + * This hooks are executed before or after the livepatch application. Pre hooks + * can veto the application/revert of the livepatch. They are not executed in + * quiesced context. All of pre and post hooks are considered vetoing, and + * hence filling any of those will block the usage of the REPLACE action. + * + * Each of the hooks below can only be set once per livepatch payload. + */ #define LIVEPATCH_PREAPPLY_HOOK(_fn) \ livepatch_precall_t *__attribute__((weak, used)) \ const livepatch_preapply_data_##_fn __section(".livepatch.hooks.preapply") = _fn; -#define LIVEPATCH_APPLY_HOOK(_fn) \ - livepatch_actioncall_t *__attribute__((weak, used)) \ - const livepatch_apply_data_##_fn __section(".livepatch.hooks.apply") = _fn; - #define LIVEPATCH_POSTAPPLY_HOOK(_fn) \ livepatch_postcall_t *__attribute__((weak, used)) \ const livepatch_postapply_data_##_fn __section(".livepatch.hooks.postapply") = _fn; @@ -112,14 +120,27 @@ struct payload { livepatch_precall_t *__attribute__((weak, used)) \ const livepatch_prerevert_data_##_fn __section(".livepatch.hooks.prerevert") = _fn; -#define LIVEPATCH_REVERT_HOOK(_fn) \ - livepatch_actioncall_t *__attribute__((weak, used)) \ - const livepatch_revert_data_##_fn __section(".livepatch.hooks.revert") = _fn; - #define LIVEPATCH_POSTREVERT_HOOK(_fn) \ livepatch_postcall_t *__attribute__((weak, used)) \ const livepatch_postrevert_data_##_fn __section(".livepatch.hooks.postrevert") = _fn; +/* + * Action replacement hooks. + * + * The following hooks replace the hypervisor implementation for the livepatch + * application and revert routines. When filling the hooks below the native + * apply and revert routines will not be executed, so the provided hooks need + * to make sure the state of the payload after apply or revert is as expected + * by the livepatch logic. + */ +#define LIVEPATCH_APPLY_HOOK(_fn) \ + livepatch_actioncall_t *__attribute__((weak, used)) \ + const livepatch_apply_data_##_fn __section(".livepatch.hooks.apply") = _fn; + +#define LIVEPATCH_REVERT_HOOK(_fn) \ + livepatch_actioncall_t *__attribute__((weak, used)) \ + const livepatch_revert_data_##_fn __section(".livepatch.hooks.revert") = _fn; + #endif /* __XEN_LIVEPATCH_PAYLOAD_H__ */ /* -- generated by git-patchbot for /home/xen/git/xen.git#staging
|
![]() |
Lists.xenproject.org is hosted with RackSpace, monitoring our |