系列文章目录
第十三章 QEMU系统仿真的机器创建分析实例
前言
本文以 QEMU 8.2.2 为例，分析其作为系统仿真工具的工作过程，并为读者展示各种 QEMU 系统仿真的启动配置实例。
本文读者需要具备一定的 QEMU 系统仿真使用经验，并对 C 语言编程有一定了解。
一、QEMU是什么？
QEMU 是一个通用且开源的机器模拟器和虚拟机。
其官方主页是：https://www.qemu.org/
二、QEMU系统仿真的机器创建分析实例
1.系统仿真的命令行参数
QEMU 作为系统仿真工具，其入口代码在 system/main.c 文件中，初始化函数 qemu_init() 的实现在 system/vl.c 文件中。
前文完成创建目标机器的过程分析，本文将继续后续运行过程的分析，读者需要对 QEMU 系统启动过程的程序代码有所了解，相关内容可以参考《QEMU系统分析之启动篇》系列文章。
..\qemu\8.2.2-qkd\qemu-system-x86_64.exe -cpu "Penryn" -M "q35,accel=whpx,smm=off" -m "6G" -display "sdl" -audio "sdl,model=hda" -vga "std" -L "data"
2.完成早期后端驱动的设置工作
这部分代码在 system/vl.c 文件中，实现如下：
int qemu_init(int argc, char **argv)
{
...
qemu_create_early_backends();
...
}
前文分析了创建显示输出和默认设备的过程，本文将继续逐步跟踪创建早期后端驱动的过程，看看系统需要提前创建哪些后端驱动。
qemu_create_early_backends()
函数 qemu_create_early_backends() 代码如下：
static void qemu_create_early_backends(void)
{
MachineClass *machine_class = MACHINE_GET_CLASS(current_machine);
#if defined(CONFIG_SDL)
const bool use_sdl = (dpy.type == DISPLAY_TYPE_SDL);
#else
const bool use_sdl = false;
#endif
#if defined(CONFIG_GTK)
const bool use_gtk = (dpy.type == DISPLAY_TYPE_GTK);
#else
const bool use_gtk = false;
#endif
if (dpy.has_window_close && !use_gtk && !use_sdl) {
error_report("window-close is only valid for GTK and SDL, "
"ignoring option");
}
qemu_console_early_init();
if (dpy.has_gl && dpy.gl != DISPLAYGL_MODE_OFF && display_opengl == 0) {
#if defined(CONFIG_OPENGL)
error_report("OpenGL is not supported by the display");
#else
error_report("OpenGL support is disabled");
#endif
exit(1);
}
object_option_foreach_add(object_create_early);
/* spice needs the timers to be initialized by this point */
/* spice must initialize before audio as it changes the default audiodev */
/* spice must initialize before chardevs (for spicevmc and spiceport) */
qemu_spice.init();
qemu_opts_foreach(qemu_find_opts("chardev"),
chardev_init_func, NULL, &error_fatal);
#ifdef CONFIG_VIRTFS
qemu_opts_foreach(qemu_find_opts("fsdev"),
fsdev_init_func, NULL, &error_fatal);
#endif
/*
* Note: we need to create audio and block backends before
* setting machine properties, so they can be referred to.
*/
configure_blockdev(&bdo_queue, machine_class, snapshot);
audio_init_audiodevs();
if (default_audio) {
audio_create_default_audiodevs();
}
}
首先我们对控制台进行前期初始化，代码如下：
qemu_console_early_init();
qemu_console_early_init();
代码如下：
void qemu_console_early_init(void)
{
/* set the default vc driver */
if (!object_class_by_name(TYPE_CHARDEV_VC)) {
type_register(&char_vc_type_info);
}
}
如果没有类型为 TYPE_CHARDEV_VC 的类，就注册这个类型。
object_option_foreach_add(object_create_early)
然后对需要提前创建的对象，将其加入对象选项表里。
初始化字符设备
接下来，对 ”chardev“ 设备调用函数 chardev_init_func() 完成字符设备的初始化，代码如下：
void qemu_display_early_init(DisplayOptions *opts)
{
...
qemu_opts_foreach(qemu_find_opts("chardev"),
chardev_init_func, NULL, &error_fatal);
...
}
configure_blockdev(&bdo_queue, machine_class, snapshot)
audio_init_audiodevs()
audio_create_default_audiodevs()
3.调试输出
首先，添加跟踪调试信息，修改后的代码如下：
```c
static void qemu_create_early_backends(void)
{
...
huedbg_flag = 1;
HUEDBG("\n");
huedbg_dump_device_configs(2);
HUEDBG("\n");
qemu_create_early_backends();
HUEDBG("\n");
huedbg_dump_device_configs(2);
HUEDBG("\n");
huedbg_flag = 0;
...
}
运行后，输出信息如下：
[13832]../system/vl.c/qemu_init(3805):
[13832]D:/msys64/home/yuhui/gitee/mingw-qemu/util/huedbg_inline-device_config.c/huedbg_dump_device_configs(134):<<<deep>>>=[2] device_configs=[p(00007ff716d51cc0)]
[13832]D:/msys64/home/yuhui/gitee/mingw-qemu/util/huedbg_inline-device_config.c/huedbg_dump_device_configs(136):device_configs.tqh_first=[00000183981af480]
[13832]D:/msys64/home/yuhui/gitee/mingw-qemu/util/huedbg_inline-device_config.c/huedbg_dump_device_config(92):<<<deep>>>=[0] conf=[00000183981af480]
[13832]D:/msys64/home/yuhui/gitee/mingw-qemu/util/huedbg_inline-device_config.c/huedbg_dump_device_config(94):type=[1]
[13832]D:/msys64/home/yuhui/gitee/mingw-qemu/util/huedbg_inline-device_config.c/huedbg_dump_device_config(98):cmdline=[vc:80Cx24C]
[13832]D:/msys64/home/yuhui/gitee/mingw-qemu/util/huedbg_inline-device_config.c/huedbg_dump_device_config(99):loc=[p(00000183981af490)]
[13832]D:/msys64/home/yuhui/gitee/mingw-qemu/util/huedbg_inline-device_config.c/huedbg_dump_device_config(100):next=[p(00000183981af4a8)]
[13832]D:/msys64/home/yuhui/gitee/mingw-qemu/util/huedbg_inline-device_config.c/huedbg_dump_device_config(101):next.tqe_next=[00000183981ae7c0]
[13832]D:/msys64/home/yuhui/gitee/mingw-qemu/util/huedbg_inline-device_config.c/huedbg_dump_device_config(92):<<<deep>>>=[0] conf=[00000183981ae7c0]
[13832]D:/msys64/home/yuhui/gitee/mingw-qemu/util/huedbg_inline-device_config.c/huedbg_dump_device_config(94):type=[2]
[13832]D:/msys64/home/yuhui/gitee/mingw-qemu/util/huedbg_inline-device_config.c/huedbg_dump_device_config(98):cmdline=[vc:80Cx24C]
[13832]D:/msys64/home/yuhui/gitee/mingw-qemu/util/huedbg_inline-device_config.c/huedbg_dump_device_config(99):loc=[p(00000183981ae7d0)]
[13832]D:/msys64/home/yuhui/gitee/mingw-qemu/util/huedbg_inline-device_config.c/huedbg_dump_device_config(100):next=[p(00000183981ae7e8)]
[13832]D:/msys64/home/yuhui/gitee/mingw-qemu/util/huedbg_inline-device_config.c/huedbg_dump_device_config(101):next.tqe_next=[0000000000000000]
[13832]D:/msys64/home/yuhui/gitee/mingw-qemu/util/huedbg_inline-device_config.c/huedbg_dump_device_configs(141):device_configs.tqh_circ.tql_next=[00000183981af480]
[13832]D:/msys64/home/yuhui/gitee/mingw-qemu/util/huedbg_inline-device_config.c/huedbg_dump_device_configs(142):device_configs.tqh_circ.tql_prev=[00000183981ae7e8]
[13832]../system/vl.c/qemu_init(3807):
[13832]../ui/console-vc.c/qemu_console_early_init(1085):enter
[13832]../qom/object.c/object_class_by_name(1095):enter
[13832]../qom/object.c/type_table_lookup(103):lookup type(chardev-vc) in hash table
[13832]../qom/object.c/object_class_by_name(1099):no type return
[13832]../ui/console-vc.c/qemu_console_early_init(1088):run
[13832]../qom/object.c/type_table_lookup(103):lookup type(chardev-vc) in hash table
[13832]../ui/console-vc.c/qemu_console_early_init(1090):run
[13832]../ui/console-vc.c/qemu_console_early_init(1092):exit
[13832]../qom/object.c/object_class_by_name(1095):enter
[13832]../qom/object.c/type_table_lookup(103):lookup type(chardev-vc) in hash table
[13832]../qom/object.c/type_table_lookup(103):lookup type(chardev) in hash table
[13832]../qom/object.c/type_get_parent(194):parent_type(chardev)
[13832]../qom/object.c/type_get_parent(194):parent_type(chardev)
[13832]../qom/object.c/type_get_parent(194):parent_type(object)
[13832]../qom/object.c/type_get_parent(194):parent_type(chardev)
[13832]../qom/object.c/type_get_parent(194):parent_type(object)
[13832]../qom/object.c/type_get_parent(196):no parent_type
[13832]../qom/object.c/type_initialize(337):name=[chardev-vc] new ti->class enter
[13832]../qom/object.c/type_get_parent(194):parent_type(chardev)
[13832]../qom/object.c/type_get_parent(194):parent_type(object)
[13832]../qom/object.c/type_get_parent(196):no parent_type
[13832]../ui/console-vc.c/char_vc_class_init(1065):enter
[13832]../qom/object.c/type_table_lookup(103):lookup type(chardev) in hash table
[13832]../qom/object.c/type_get_parent(194):parent_type(chardev)
[13832]../ui/console-vc.c/char_vc_class_init(1073):exit
[13832]../qom/object.c/type_initialize(410):name=[chardev-vc] new class return
[13832]../qom/object.c/object_class_by_name(1105):class(chardev-vc) return
[13832]../qom/object.c/type_table_lookup(103):lookup type(chardev) in hash table
[13832]../qom/object.c/type_get_parent(194):parent_type(chardev)
[13832]../qom/object.c/object_class_by_name(1095):enter
[13832]../qom/object.c/type_table_lookup(103):lookup type(chardev-vc) in hash table
[13832]../qom/object.c/object_class_by_name(1105):class(chardev-vc) return
[13832]../qom/object.c/type_table_lookup(103):lookup type(chardev) in hash table
[13832]../qom/object.c/type_get_parent(194):parent_type(chardev)
[13832]../qom/object.c/type_table_lookup(103):lookup type(chardev-vc) in hash table
[13832]../qom/object.c/object_new_with_type(789):try type_initialize(chardev-vc)
[13832]../qom/object.c/object_new_with_type(799):obj(chardev-vc) alloc
[13832]../qom/object.c/object_new_with_type(808):try object_initialize_with_type(chardev-vc)
[13832]../qom/object.c/object_initialize_with_type(568):obj with type(chardev-vc) enter
[13832]../qom/object.c/object_initialize_with_type(576):mapping obj(chardev-vc).class with type(chardev-vc).class
[13832]../qom/object.c/object_initialize_with_type(579):try object_class_property_init_all(chardev-vc)
[13832]../qom/object.c/object_class_property_init_all(552):obj(chardev-vc) enter
[13832]../qom/object.c/object_class_property_iter_init(1440):objclass{chardev-vc} enter
[13832]../qom/object.c/object_class_get_parent(1130):enter
[13832]../qom/object.c/type_get_parent(194):parent_type(chardev)
[13832]../qom/object.c/object_class_get_parent(1138):objclass(chardev-vc) has parent(chardev)
[13832]../qom/object.c/object_class_get_parent(1141):objclass(chardev-vc) return
[13832]../qom/object.c/object_class_property_iter_init(1443):objclass{chardev-vc} return
[13832]../qom/object.c/object_class_get_parent(1130):enter
[13832]../qom/object.c/type_get_parent(194):parent_type(object)
[13832]../qom/object.c/object_class_get_parent(1138):objclass(chardev) has parent(object)
[13832]../qom/object.c/object_class_get_parent(1141):objclass(chardev) return
[13832]../qom/object.c/object_class_get_parent(1130):enter
[13832]../qom/object.c/type_get_parent(196):no parent_type
[13832]../qom/object.c/object_class_get_parent(1134):objclass(object) has no parent return
[13832]../qom/object.c/object_class_property_init_all(555):prop name=[type] type=[string] desc=[(null)] init=[0000000000000000]
[13832]../qom/object.c/object_class_property_init_all(563):obj(chardev-vc) return
[13832]../qom/object.c/object_initialize_with_type(583):try object_init_with_type(chardev-vc)
[13832]../qom/object.c/object_init_with_type(416):obj->class->type->name=[chardev-vc] ti->name=[chardev-vc] enter
[13832]../qom/object.c/type_get_parent(194):parent_type(chardev)
[13832]../qom/object.c/object_init_with_type(416):obj->class->type->name=[chardev-vc] ti->name=[chardev] enter
[13832]../qom/object.c/type_get_parent(194):parent_type(object)
[13832]../qom/object.c/object_init_with_type(416):obj->class->type->name=[chardev-vc] ti->name=[object] enter
[13832]../qom/object.c/object_init_with_type(427):obj->class->type->name=[chardev-vc] ti->name=[object] return
[13832]../qom/object.c/object_init_with_type(423):name=[chardev] ti->instance_init() before
[13832]../qom/object.c/type_table_lookup(103):lookup type(chardev) in hash table
[13832]../qom/object.c/type_get_parent(194):parent_type(chardev)
[13832]../qom/object.c/object_init_with_type(425):name=[chardev] ti->instance_init() after
[13832]../qom/object.c/object_init_with_type(427):obj->class->type->name=[chardev-vc] ti->name=[chardev] return
[13832]../qom/object.c/object_init_with_type(427):obj->class->type->name=[chardev-vc] ti->name=[chardev-vc] return
[13832]../qom/object.c/object_initialize_with_type(585):try object_post_init_with_type(chardev-vc)
[13832]../qom/object.c/object_post_init_with_type(433):obj->class->type->name=[chardev-vc] ti->name=[chardev-vc] enter
[13832]../qom/object.c/type_get_parent(194):parent_type(chardev)
[13832]../qom/object.c/object_post_init_with_type(433):obj->class->type->name=[chardev-vc] ti->name=[chardev] enter
[13832]../qom/object.c/type_get_parent(194):parent_type(object)
[13832]../qom/object.c/object_post_init_with_type(433):obj->class->type->name=[chardev-vc] ti->name=[object] enter
[13832]../qom/object.c/object_post_init_with_type(444):return
[13832]../qom/object.c/object_post_init_with_type(444):return
[13832]../qom/object.c/object_post_init_with_type(444):return
[13832]../qom/object.c/object_initialize_with_type(587):obj(chardev-vc) return
[13832]../qom/object.c/object_new_with_type(812):obj(chardev-vc) return
[13832]../ui/console-vc.c/vc_chr_open(978):enter
[13832]../qom/object.c/type_table_lookup(103):lookup type(chardev-vc) in hash table
[13832]../qom/object.c/type_table_lookup(103):lookup type(qemu-fixed-text-console) in hash table
[13832]../qom/object.c/object_new_with_type(789):try type_initialize(qemu-fixed-text-console)
[13832]../qom/object.c/object_new_with_type(799):obj(qemu-fixed-text-console) alloc
[13832]../qom/object.c/object_new_with_type(808):try object_initialize_with_type(qemu-fixed-text-console)
[13832]../qom/object.c/object_initialize_with_type(568):obj with type(qemu-fixed-text-console) enter
[13832]../qom/object.c/object_initialize_with_type(576):mapping obj(qemu-fixed-text-console).class with type(qemu-fixed-text-console).class
[13832]../qom/object.c/object_initialize_with_type(579):try object_class_property_init_all(qemu-fixed-text-console)
[13832]../qom/object.c/object_class_property_init_all(552):obj(qemu-fixed-text-console) enter
[13832]../qom/object.c/object_class_property_iter_init(1440):objclass{qemu-fixed-text-console} enter
[13832]../qom/object.c/object_class_get_parent(1130):enter
[13832]../qom/object.c/type_get_parent(194):parent_type(qemu-text-console)
[13832]../qom/object.c/object_class_get_parent(1138):objclass(qemu-fixed-text-console) has parent(qemu-text-console)
[13832]../qom/object.c/object_class_get_parent(1141):objclass(qemu-fixed-text-console) return
[13832]../qom/object.c/object_class_property_iter_init(1443):objclass{qemu-fixed-text-console} return
[13832]../qom/object.c/object_class_get_parent(1130):enter
[13832]../qom/object.c/type_get_parent(194):parent_type(qemu-console)
[13832]../qom/object.c/object_class_get_parent(1138):objclass(qemu-text-console) has parent(qemu-console)
[13832]../qom/object.c/object_class_get_parent(1141):objclass(qemu-text-console) return
[13832]../qom/object.c/object_class_get_parent(1130):enter
[13832]../qom/object.c/type_get_parent(194):parent_type(object)
[13832]../qom/object.c/object_class_get_parent(1138):objclass(qemu-console) has parent(object)
[13832]../qom/object.c/object_class_get_parent(1141):objclass(qemu-console) return
[13832]../qom/object.c/object_class_get_parent(1130):enter
[13832]../qom/object.c/type_get_parent(196):no parent_type
[13832]../qom/object.c/object_class_get_parent(1134):objclass(object) has no parent return
[13832]../qom/object.c/object_class_property_init_all(555):prop name=[type] type=[string] desc=[(null)] init=[0000000000000000]
[13832]../qom/object.c/object_class_property_init_all(563):obj(qemu-fixed-text-console) return
[13832]../qom/object.c/object_initialize_with_type(583):try object_init_with_type(qemu-fixed-text-console)
[13832]../qom/object.c/object_init_with_type(416):obj->class->type->name=[qemu-fixed-text-console] ti->name=[qemu-fixed-text-console] enter
[13832]../qom/object.c/type_get_parent(194):parent_type(qemu-text-console)
[13832]../qom/object.c/object_init_with_type(416):obj->class->type->name=[qemu-fixed-text-console] ti->name=[qemu-text-console] enter
[13832]../qom/object.c/type_get_parent(194):parent_type(qemu-console)
[13832]../qom/object.c/object_init_with_type(416):obj->class->type->name=[qemu-fixed-text-console] ti->name=[qemu-console] enter
[13832]../qom/object.c/type_get_parent(194):parent_type(object)
[13832]../qom/object.c/object_init_with_type(416):obj->class->type->name=[qemu-fixed-text-console] ti->name=[object] enter
[13832]../qom/object.c/object_init_with_type(427):obj->class->type->name=[qemu-fixed-text-console] ti->name=[object] return
[13832]../qom/object.c/object_init_with_type(423):name=[qemu-console] ti->instance_init() before
[13832]../qom/object.c/type_table_lookup(103):lookup type(qemu-console) in hash table
[13832]../qom/object.c/type_get_parent(194):parent_type(qemu-text-console)
[13832]../qom/object.c/type_get_parent(194):parent_type(qemu-console)
[13832]../qom/object.c/object_init_with_type(425):name=[qemu-console] ti->instance_init() after
[13832]../qom/object.c/object_init_with_type(427):obj->class->type->name=[qemu-fixed-text-console] ti->name=[qemu-console] return
[13832]../qom/object.c/object_init_with_type(423):name=[qemu-text-console] ti->instance_init() before
[13832]../qom/object.c/type_table_lookup(103):lookup type(qemu-text-console) in hash table
[13832]../qom/object.c/type_get_parent(194):parent_type(qemu-text-console)
[13832]../qom/object.c/type_table_lookup(103):lookup type(qemu-console) in hash table
[13832]../qom/object.c/type_get_parent(194):parent_type(qemu-text-console)
[13832]../qom/object.c/type_get_parent(194):parent_type(qemu-console)
[13832]../qom/object.c/object_init_with_type(425):name=[qemu-text-console] ti->instance_init() after
[13832]../qom/object.c/object_init_with_type(427):obj->class->type->name=[qemu-fixed-text-console] ti->name=[qemu-text-console] return
[13832]../qom/object.c/object_init_with_type(423):name=[qemu-fixed-text-console] ti->instance_init() before
[13832]../qom/object.c/object_init_with_type(425):name=[qemu-fixed-text-console] ti->instance_init() after
[13832]../qom/object.c/object_init_with_type(427):obj->class->type->name=[qemu-fixed-text-console] ti->name=[qemu-fixed-text-console] return
[13832]../qom/object.c/object_initialize_with_type(585):try object_post_init_with_type(qemu-fixed-text-console)
[13832]../qom/object.c/object_post_init_with_type(433):obj->class->type->name=[qemu-fixed-text-console] ti->name=[qemu-fixed-text-console] enter
[13832]../qom/object.c/type_get_parent(194):parent_type(qemu-text-console)
[13832]../qom/object.c/object_post_init_with_type(433):obj->class->type->name=[qemu-fixed-text-console] ti->name=[qemu-text-console] enter
[13832]../qom/object.c/type_get_parent(194):parent_type(qemu-console)
[13832]../qom/object.c/object_post_init_with_type(433):obj->class->type->name=[qemu-fixed-text-console] ti->name=[qemu-console] enter
[13832]../qom/object.c/type_get_parent(194):parent_type(object)
[13832]../qom/object.c/object_post_init_with_type(433):obj->class->type->name=[qemu-fixed-text-console] ti->name=[object] enter
[13832]../qom/object.c/object_post_init_with_type(444):return
[13832]../qom/object.c/object_post_init_with_type(444):return
[13832]../qom/object.c/object_post_init_with_type(444):return
[13832]../qom/object.c/object_post_init_with_type(444):return
[13832]../qom/object.c/object_initialize_with_type(587):obj(qemu-fixed-text-console) return
[13832]../qom/object.c/object_new_with_type(812):obj(qemu-fixed-text-console) return
[13832]../ui/console-vc.c/vc_chr_open(1026):enter
[13832]../qom/object.c/object_class_get_parent(1130):enter
[13832]../qom/object.c/type_get_parent(194):parent_type(object)
[13832]../qom/object.c/object_class_get_parent(1138):objclass(container) has parent(object)
[13832]../qom/object.c/object_class_get_parent(1141):objclass(container) return
[13832]../qom/object.c/object_class_get_parent(1130):enter
[13832]../qom/object.c/type_get_parent(196):no parent_type
[13832]../qom/object.c/object_class_get_parent(1134):objclass(object) has no parent return
[13832]../qom/object.c/type_table_lookup(103):lookup type(container) in hash table
[13832]../qom/object.c/object_new_with_type(789):try type_initialize(container)
[13832]../qom/object.c/object_new_with_type(799):obj(container) alloc
[13832]../qom/object.c/object_new_with_type(808):try object_initialize_with_type(container)
[13832]../qom/object.c/object_initialize_with_type(568):obj with type(container) enter
[13832]../qom/object.c/object_initialize_with_type(576):mapping obj(container).class with type(container).class
[13832]../qom/object.c/object_initialize_with_type(579):try object_class_property_init_all(container)
[13832]../qom/object.c/object_class_property_init_all(552):obj(container) enter
[13832]../qom/object.c/object_class_property_iter_init(1440):objclass{container} enter
[13832]../qom/object.c/object_class_get_parent(1130):enter
[13832]../qom/object.c/type_get_parent(194):parent_type(object)
[13832]../qom/object.c/object_class_get_parent(1138):objclass(container) has parent(object)
[13832]../qom/object.c/object_class_get_parent(1141):objclass(container) return
[13832]../qom/object.c/object_class_property_iter_init(1443):objclass{container} return
[13832]../qom/object.c/object_class_get_parent(1130):enter
[13832]../qom/object.c/type_get_parent(196):no parent_type
[13832]../qom/object.c/object_class_get_parent(1134):objclass(object) has no parent return
[13832]../qom/object.c/object_class_property_init_all(555):prop name=[type] type=[string] desc=[(null)] init=[0000000000000000]
[13832]../qom/object.c/object_class_property_init_all(563):obj(container) return
[13832]../qom/object.c/object_initialize_with_type(583):try object_init_with_type(container)
[13832]../qom/object.c/object_init_with_type(416):obj->class->type->name=[container] ti->name=[container] enter
[13832]../qom/object.c/type_get_parent(194):parent_type(object)
[13832]../qom/object.c/object_init_with_type(416):obj->class->type->name=[container] ti->name=[object] enter
[13832]../qom/object.c/object_init_with_type(427):obj->class->type->name=[container] ti->name=[object] return
[13832]../qom/object.c/object_init_with_type(427):obj->class->type->name=[container] ti->name=[container] return
[13832]../qom/object.c/object_initialize_with_type(585):try object_post_init_with_type(container)
[13832]../qom/object.c/object_post_init_with_type(433):obj->class->type->name=[container] ti->name=[container] enter
[13832]../qom/object.c/type_get_parent(194):parent_type(object)
[13832]../qom/object.c/object_post_init_with_type(433):obj->class->type->name=[container] ti->name=[object] enter
[13832]../qom/object.c/object_post_init_with_type(444):return
[13832]../qom/object.c/object_post_init_with_type(444):return
[13832]../qom/object.c/object_initialize_with_type(587):obj(container) return
[13832]../qom/object.c/object_new_with_type(812):obj(container) return
[13832]../qom/object.c/object_property_try_add(1309):name=[chardevs] enter!
[13832]../qom/object.c/object_class_get_parent(1130):enter
[13832]../qom/object.c/type_get_parent(194):parent_type(object)
[13832]../qom/object.c/object_class_get_parent(1138):objclass(container) has parent(object)
[13832]../qom/object.c/object_class_get_parent(1141):objclass(container) return
[13832]../qom/object.c/object_class_get_parent(1130):enter
[13832]../qom/object.c/type_get_parent(196):no parent_type
[13832]../qom/object.c/object_class_get_parent(1134):objclass(object) has no parent return
[13832]../qom/object.c/object_property_try_add(1350):name=[chardevs] return-3!
[13832]../qom/object.c/object_property_try_add(1309):name=[compat_monitor0] enter!
[13832]../qom/object.c/object_class_get_parent(1130):enter
[13832]../qom/object.c/type_get_parent(194):parent_type(object)
[13832]../qom/object.c/object_class_get_parent(1138):objclass(container) has parent(object)
[13832]../qom/object.c/object_class_get_parent(1141):objclass(container) return
[13832]../qom/object.c/object_class_get_parent(1130):enter
[13832]../qom/object.c/type_get_parent(196):no parent_type
[13832]../qom/object.c/object_class_get_parent(1134):objclass(object) has no parent return
[13832]../qom/object.c/object_property_try_add(1350):name=[compat_monitor0] return-3!
[13832]../system/vl.c/qemu_create_early_backends(2027):
[13832]../blockdev.c/drive_new(879):value=[cdrom]
[13832]../blockdev.c/drive_new(1019):
[13832]../blockdev.c/blockdev_init(484):
[13832]../blockdev.c/drive_new(1021):
[13832]../blockdev.c/drive_new(879):value=[(null)]
[13832]../blockdev.c/drive_new(1019):
[13832]../blockdev.c/blockdev_init(484):
[13832]../blockdev.c/drive_new(1021):
[13832]../system/vl.c/qemu_create_early_backends(2029):
[13832]../system/vl.c/qemu_create_early_backends(2031):
[13832]../system/vl.c/qemu_init(3809):
[13832]D:/msys64/home/yuhui/gitee/mingw-qemu/util/huedbg_inline-device_config.c/huedbg_dump_device_configs(134):<<<deep>>>=[2] device_configs=[p(00007ff716d51cc0)]
[13832]D:/msys64/home/yuhui/gitee/mingw-qemu/util/huedbg_inline-device_config.c/huedbg_dump_device_configs(136):device_configs.tqh_first=[00000183981af480]
[13832]D:/msys64/home/yuhui/gitee/mingw-qemu/util/huedbg_inline-device_config.c/huedbg_dump_device_config(92):<<<deep>>>=[0] conf=[00000183981af480]
[13832]D:/msys64/home/yuhui/gitee/mingw-qemu/util/huedbg_inline-device_config.c/huedbg_dump_device_config(94):type=[1]
[13832]D:/msys64/home/yuhui/gitee/mingw-qemu/util/huedbg_inline-device_config.c/huedbg_dump_device_config(98):cmdline=[vc:80Cx24C]
[13832]D:/msys64/home/yuhui/gitee/mingw-qemu/util/huedbg_inline-device_config.c/huedbg_dump_device_config(99):loc=[p(00000183981af490)]
[13832]D:/msys64/home/yuhui/gitee/mingw-qemu/util/huedbg_inline-device_config.c/huedbg_dump_device_config(100):next=[p(00000183981af4a8)]
[13832]D:/msys64/home/yuhui/gitee/mingw-qemu/util/huedbg_inline-device_config.c/huedbg_dump_device_config(101):next.tqe_next=[00000183981ae7c0]
[13832]D:/msys64/home/yuhui/gitee/mingw-qemu/util/huedbg_inline-device_config.c/huedbg_dump_device_config(92):<<<deep>>>=[0] conf=[00000183981ae7c0]
[13832]D:/msys64/home/yuhui/gitee/mingw-qemu/util/huedbg_inline-device_config.c/huedbg_dump_device_config(94):type=[2]
[13832]D:/msys64/home/yuhui/gitee/mingw-qemu/util/huedbg_inline-device_config.c/huedbg_dump_device_config(98):cmdline=[vc:80Cx24C]
[13832]D:/msys64/home/yuhui/gitee/mingw-qemu/util/huedbg_inline-device_config.c/huedbg_dump_device_config(99):loc=[p(00000183981ae7d0)]
[13832]D:/msys64/home/yuhui/gitee/mingw-qemu/util/huedbg_inline-device_config.c/huedbg_dump_device_config(100):next=[p(00000183981ae7e8)]
[13832]D:/msys64/home/yuhui/gitee/mingw-qemu/util/huedbg_inline-device_config.c/huedbg_dump_device_config(101):next.tqe_next=[0000000000000000]
[13832]D:/msys64/home/yuhui/gitee/mingw-qemu/util/huedbg_inline-device_config.c/huedbg_dump_device_configs(141):device_configs.tqh_circ.tql_next=[00000183981af480]
[13832]D:/msys64/home/yuhui/gitee/mingw-qemu/util/huedbg_inline-device_config.c/huedbg_dump_device_configs(142):device_configs.tqh_circ.tql_prev=[00000183981ae7e8]
总结
以上分析了系统初始化过程中创建早期后端驱动的过程。