diff options
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/rseq.h | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/include/linux/rseq.h b/include/linux/rseq.h index 241067bf20db..c6267f70c746 100644 --- a/include/linux/rseq.h +++ b/include/linux/rseq.h @@ -38,6 +38,22 @@ static __always_inline void rseq_exit_to_user_mode(void) } /* + * KVM/HYPERV invoke resume_user_mode_work() before entering guest mode, + * which clears TIF_NOTIFY_RESUME. To avoid updating user space RSEQ in + * that case just to do it eventually again before returning to user space, + * the entry resume_user_mode_work() invocation is ignored as the register + * argument is NULL. + * + * After returning from guest mode, they have to invoke this function to + * re-raise TIF_NOTIFY_RESUME if necessary. + */ +static inline void rseq_virt_userspace_exit(void) +{ + if (current->rseq_event_pending) + set_tsk_thread_flag(current, TIF_NOTIFY_RESUME); +} + +/* * If parent process has a registered restartable sequences area, the * child inherits. Unregister rseq for a clone with CLONE_VM set. */ @@ -68,6 +84,7 @@ static inline void rseq_execve(struct task_struct *t) static inline void rseq_handle_notify_resume(struct pt_regs *regs) { } static inline void rseq_signal_deliver(struct ksignal *ksig, struct pt_regs *regs) { } static inline void rseq_sched_switch_event(struct task_struct *t) { } +static inline void rseq_virt_userspace_exit(void) { } static inline void rseq_fork(struct task_struct *t, u64 clone_flags) { } static inline void rseq_execve(struct task_struct *t) { } static inline void rseq_exit_to_user_mode(void) { } |