accel/system: Document cpu_synchronize_state()

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Zhao Liu <zhao1.liu@intel.com>
Message-Id: <20250703173248.44995-23-philmd@linaro.org>

include/system/accel-ops.h

@@ -42,6 +42,14 @@ struct AccelOpsClass {
 
     void (*synchronize_post_reset)(CPUState *cpu);
     void (*synchronize_post_init)(CPUState *cpu);
+    /**
+     * synchronize_state:
+     * synchronize_pre_loadvm:
+     * @cpu: The vCPU to synchronize.
+     *
+     * Request to synchronize QEMU vCPU registers from the hardware accelerator
+     * (the hardware accelerator is the reference).
+     */
     void (*synchronize_state)(CPUState *cpu);
     void (*synchronize_pre_loadvm)(CPUState *cpu);
     void (*synchronize_pre_resume)(bool step_pending);

include/system/hw_accel.h

@@ -17,9 +17,18 @@
 #include "system/whpx.h"
 #include "system/nvmm.h"
 
+/**
+ * cpu_synchronize_state:
+ * cpu_synchronize_pre_loadvm:
+ * @cpu: The vCPU to synchronize.
+ *
+ * Request to synchronize QEMU vCPU registers from the hardware accelerator
+ * (the hardware accelerator is the reference).
+ */
 void cpu_synchronize_state(CPUState *cpu);
+void cpu_synchronize_pre_loadvm(CPUState *cpu);
+
 void cpu_synchronize_post_reset(CPUState *cpu);
 void cpu_synchronize_post_init(CPUState *cpu);
-void cpu_synchronize_pre_loadvm(CPUState *cpu);
 
 #endif /* QEMU_HW_ACCEL_H */