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| author | Alex Bennée <alex.bennee@linaro.org> | 2024-06-20 16:22:16 +0100 |
|---|---|---|
| committer | Alex Bennée <alex.bennee@linaro.org> | 2024-06-24 10:15:04 +0100 |
| commit | 847a65dd76bf1868c7966a2b2608dcd00cb68dc7 (patch) | |
| tree | 16b4986d25cca97ed4fa82cfa52c57b62e5a3dff /plugins | |
| parent | d4d133a34b300b574d446316491828867205d17f (diff) | |
| download | qemu-847a65dd76bf1868c7966a2b2608dcd00cb68dc7.zip qemu-847a65dd76bf1868c7966a2b2608dcd00cb68dc7.tar.gz qemu-847a65dd76bf1868c7966a2b2608dcd00cb68dc7.tar.bz2 | |
plugins: add time control API
Expose the ability to control time through the plugin API. Only one
plugin can control time so it has to request control when loaded.
There are probably more corner cases to catch here.
Signed-off-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
[AJB: tweaked user-mode handling, merged QEMU_PLUGIN_API fix]
Message-Id: <20240530220610.1245424-6-pierrick.bouvier@linaro.org>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20240620152220.2192768-9-alex.bennee@linaro.org>
Diffstat (limited to 'plugins')
| -rw-r--r-- | plugins/api.c | 35 | ||||
| -rw-r--r-- | plugins/qemu-plugins.symbols | 2 |
2 files changed, 37 insertions, 0 deletions
diff --git a/plugins/api.c b/plugins/api.c index 6bdb26b..4431a0e 100644 --- a/plugins/api.c +++ b/plugins/api.c @@ -39,6 +39,7 @@ #include "qemu/main-loop.h" #include "qemu/plugin.h" #include "qemu/log.h" +#include "qemu/timer.h" #include "tcg/tcg.h" #include "exec/exec-all.h" #include "exec/gdbstub.h" @@ -583,3 +584,37 @@ uint64_t qemu_plugin_u64_sum(qemu_plugin_u64 entry) } return total; } + +/* + * Time control + */ +static bool has_control; + +const void *qemu_plugin_request_time_control(void) +{ + if (!has_control) { + has_control = true; + return &has_control; + } + return NULL; +} + +#ifdef CONFIG_SOFTMMU +static void advance_virtual_time__async(CPUState *cpu, run_on_cpu_data data) +{ + int64_t new_time = data.host_ulong; + qemu_clock_advance_virtual_time(new_time); +} +#endif + +void qemu_plugin_update_ns(const void *handle, int64_t new_time) +{ +#ifdef CONFIG_SOFTMMU + if (handle == &has_control) { + /* Need to execute out of cpu_exec, so bql can be locked. */ + async_run_on_cpu(current_cpu, + advance_virtual_time__async, + RUN_ON_CPU_HOST_ULONG(new_time)); + } +#endif +} diff --git a/plugins/qemu-plugins.symbols b/plugins/qemu-plugins.symbols index aa0a77a..ca773d8 100644 --- a/plugins/qemu-plugins.symbols +++ b/plugins/qemu-plugins.symbols @@ -38,6 +38,7 @@ qemu_plugin_register_vcpu_tb_exec_cond_cb; qemu_plugin_register_vcpu_tb_exec_inline_per_vcpu; qemu_plugin_register_vcpu_tb_trans_cb; + qemu_plugin_request_time_control; qemu_plugin_reset; qemu_plugin_scoreboard_free; qemu_plugin_scoreboard_find; @@ -51,5 +52,6 @@ qemu_plugin_u64_set; qemu_plugin_u64_sum; qemu_plugin_uninstall; + qemu_plugin_update_ns; qemu_plugin_vcpu_for_each; }; |