accel/dummy: Extract 'dummy-cpus.h' header from 'system/cpus.h'

'dummy' helpers are specific to accelerator implementations,
no need to expose them via "system/cpus.h".

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Xiaoyao Li <xiaoyao.li@intel.com>
Reviewed-by: Zhao Liu <zhao1.liu@intel.com>
Message-Id: <20250703173248.44995-27-philmd@linaro.org>

MAINTAINERS

@@ -503,6 +503,7 @@ F: include/system/accel-*.h
 F: include/system/cpus.h
 F: include/accel/accel-cpu*.h
 F: accel/accel-*.?
+F: accel/dummy-cpus.?
 F: accel/Makefile.objs
 F: accel/stubs/Makefile.objs
 F: cpu-common.c

accel/dummy-cpus.c

@@ -17,6 +17,7 @@
 #include "qemu/guest-random.h"
 #include "qemu/main-loop.h"
 #include "hw/core/cpu.h"
+#include "accel/dummy-cpus.h"
 
 static void *dummy_cpu_thread_fn(void *arg)
 {

accel/dummy-cpus.h

@@ -0,0 +1,14 @@
+/*
+ * Dummy cpu thread code
+ *
+ * Copyright IBM, Corp. 2011
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
+#ifndef ACCEL_DUMMY_CPUS_H
+#define ACCEL_DUMMY_CPUS_H
+
+void dummy_start_vcpu_thread(CPUState *cpu);
+
+#endif

accel/qtest/qtest.c

@@ -24,6 +24,7 @@
 #include "qemu/guest-random.h"
 #include "qemu/main-loop.h"
 #include "hw/core/cpu.h"
+#include "accel/dummy-cpus.h"
 
 static int64_t qtest_clock_counter;
 

accel/xen/xen-all.c

@@ -18,6 +18,7 @@
 #include "hw/xen/xen_igd.h"
 #include "chardev/char.h"
 #include "qemu/accel.h"
+#include "accel/dummy-cpus.h"
 #include "system/accel-ops.h"
 #include "system/cpus.h"
 #include "system/xen.h"

include/system/cpus.h

@@ -7,11 +7,6 @@ void cpus_register_accel(const AccelOpsClass *i);
 /* return registers ops */
 const AccelOpsClass *cpus_get_accel(void);
 
-/* accel/dummy-cpus.c */
-
-/* Create a dummy vcpu for AccelOpsClass->create_vcpu_thread */
-void dummy_start_vcpu_thread(CPUState *);
-
 /* interface available for cpus accelerator threads */
 
 /* For temporary buffers for forming a name */