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| author | Alex Bennée <alex.bennee@linaro.org> | 2022-10-04 12:52:21 +0100 |
|---|---|---|
| committer | Alex Bennée <alex.bennee@linaro.org> | 2022-10-06 11:53:41 +0100 |
| commit | f7e15affa8e574a800180de3bde1a6462aec7241 (patch) | |
| tree | c759a5deb49756097f301652837b14ffc91ef6b2 /include | |
| parent | 37e62694e4bcc937c8c5fa6153302a5451fb12c5 (diff) | |
| download | qemu-f7e15affa8e574a800180de3bde1a6462aec7241.zip qemu-f7e15affa8e574a800180de3bde1a6462aec7241.tar.gz qemu-f7e15affa8e574a800180de3bde1a6462aec7241.tar.bz2 | |
plugins: add [pre|post]fork helpers to linux-user
Special care needs to be taken in ensuring locks are in a consistent
state across fork events. Add helpers so the plugin system can ensure
that.
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Fixes: https://gitlab.com/qemu-project/qemu/-/issues/358
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Tested-by: Daniel P. Berrangé <berrange@redhat.com>
Message-Id: <20221004115221.2174499-1-alex.bennee@linaro.org>
Diffstat (limited to 'include')
| -rw-r--r-- | include/qemu/plugin.h | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/include/qemu/plugin.h b/include/qemu/plugin.h index 145f8a2..a772e14 100644 --- a/include/qemu/plugin.h +++ b/include/qemu/plugin.h @@ -224,6 +224,23 @@ void qemu_plugin_disable_mem_helpers(CPUState *cpu); */ void qemu_plugin_user_exit(void); +/** + * qemu_plugin_user_prefork_lock(): take plugin lock before forking + * + * This is a user-mode only helper to take the internal plugin lock + * before a fork event. This is ensure a consistent lock state + */ +void qemu_plugin_user_prefork_lock(void); + +/** + * qemu_plugin_user_postfork(): reset the plugin lock + * @is_child: is this thread the child + * + * This user-mode only helper resets the lock state after a fork so we + * can continue using the plugin interface. + */ +void qemu_plugin_user_postfork(bool is_child); + #else /* !CONFIG_PLUGIN */ static inline void qemu_plugin_add_opts(void) @@ -287,6 +304,13 @@ static inline void qemu_plugin_disable_mem_helpers(CPUState *cpu) static inline void qemu_plugin_user_exit(void) { } + +static inline void qemu_plugin_user_prefork_lock(void) +{ } + +static inline void qemu_plugin_user_postfork(bool is_child) +{ } + #endif /* !CONFIG_PLUGIN */ #endif /* QEMU_PLUGIN_H */ |