cpu: Add qemu_for_each_cpu()

Wrapper to avoid open-coded loops and to make CPUState iteration
independent of CPUArchState.
Signed-off-by: NMichael S. Tsirkin <mst@redhat.com>
Signed-off-by: NIgor Mammedov <imammedo@redhat.com>
Signed-off-by: NAndreas Färber <afaerber@suse.de>

exec.c

@@ -265,6 +265,16 @@ CPUState *qemu_get_cpu(int index)
     return env ? cpu : NULL;
 }
 
+void qemu_for_each_cpu(void (*func)(CPUState *cpu, void *data), void *data)
+{
+    CPUArchState *env = first_cpu;
+
+    while (env) {
+        func(ENV_GET_CPU(env), data);
+        env = env->next_cpu;
+    }
+}
+
 void cpu_exec_init(CPUArchState *env)
 {
     CPUState *cpu = ENV_GET_CPU(env);

include/qom/cpu.h

@@ -215,6 +215,15 @@ bool cpu_is_stopped(CPUState *cpu);
  */
 void run_on_cpu(CPUState *cpu, void (*func)(void *data), void *data);
 
+/**
+ * qemu_for_each_cpu:
+ * @func: The function to be executed.
+ * @data: Data to pass to the function.
+ *
+ * Executes @func for each CPU.
+ */
+void qemu_for_each_cpu(void (*func)(CPUState *cpu, void *data), void *data);
+
 /**
  * qemu_get_cpu:
  * @index: The CPUState@cpu_index value of the CPU to obtain.