plugins: conditional callbacks

Extend plugins API to support callback called with a given criteria
(evaluated inline).

Added functions:
- qemu_plugin_register_vcpu_tb_exec_cond_cb
- qemu_plugin_register_vcpu_insn_exec_cond_cb

They expect as parameter a condition, a qemu_plugin_u64_t (op1) and an
immediate (op2). Callback is called if op1 |cond| op2 is true.

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
Message-Id: <20240502211522.346467-6-pierrick.bouvier@linaro.org>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
[AJB: fix re-base conflict with tb_is_mem_only()]
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20240514174253.694591-8-alex.bennee@linaro.org>

plugins/plugin.h

@@ -93,6 +93,14 @@ plugin_register_dyn_cb__udata(GArray **arr,
                               qemu_plugin_vcpu_udata_cb_t cb,
                               enum qemu_plugin_cb_flags flags, void *udata);
 
+void
+plugin_register_dyn_cond_cb__udata(GArray **arr,
+                                   qemu_plugin_vcpu_udata_cb_t cb,
+                                   enum qemu_plugin_cb_flags flags,
+                                   enum qemu_plugin_cond cond,
+                                   qemu_plugin_u64 entry,
+                                   uint64_t imm,
+                                   void *udata);
 
 void plugin_register_vcpu_mem_cb(GArray **arr,
                                  void *cb,