diff options
| -rw-r--r-- | include/qemu/qemu-plugin.h | 27 | ||||
| -rw-r--r-- | plugins/api.c | 35 | ||||
| -rw-r--r-- | plugins/qemu-plugins.symbols | 2 |
3 files changed, 64 insertions, 0 deletions
diff --git a/include/qemu/qemu-plugin.h b/include/qemu/qemu-plugin.h index 95703d8fec..c71c705b69 100644 --- a/include/qemu/qemu-plugin.h +++ b/include/qemu/qemu-plugin.h @@ -661,6 +661,33 @@ void qemu_plugin_register_vcpu_mem_inline_per_vcpu( qemu_plugin_u64 entry, uint64_t imm); +/** + * qemu_plugin_request_time_control() - request the ability to control time + * + * This grants the plugin the ability to control system time. Only one + * plugin can control time so if multiple plugins request the ability + * all but the first will fail. + * + * Returns an opaque handle or NULL if fails + */ +QEMU_PLUGIN_API +const void *qemu_plugin_request_time_control(void); + +/** + * qemu_plugin_update_ns() - update system emulation time + * @handle: opaque handle returned by qemu_plugin_request_time_control() + * @time: time in nanoseconds + * + * This allows an appropriately authorised plugin (i.e. holding the + * time control handle) to move system time forward to @time. For + * user-mode emulation the time is not changed by this as all reported + * time comes from the host kernel. + * + * Start time is 0. + */ +QEMU_PLUGIN_API +void qemu_plugin_update_ns(const void *handle, int64_t time); + typedef void (*qemu_plugin_vcpu_syscall_cb_t)(qemu_plugin_id_t id, unsigned int vcpu_index, int64_t num, uint64_t a1, uint64_t a2, diff --git a/plugins/api.c b/plugins/api.c index 6bdb26bbe3..4431a0ea7e 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 aa0a77a319..ca773d8d9f 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; }; |