qemu-kvm-0.12.3主要函数路径-优快云博客

本文详细解析了QEMU启动过程中的关键步骤，包括初始化、创建上下文、虚拟CPU的初始化等，并介绍了各主要函数调用路径及线程执行流程。

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Entry point:
main(vl.c)
      |
kvm_init(qemu-kvm.c) -> machine->init(pc_init_pci in ./hw/pc.c)-> main_loop(vl.c)
      |                                                                    |                               |
kvm_create_context(qemu-kvm.c)             pc_init1(pc.c)    kvm_main_loop(q-k.c)->main_loop_wait
      |                                                                    |                               |
kvm_create(qemu-kvm.c)                    pc_new_cpu(pc.c)    qemu_signalfd(compatfd.c)

| | |
ioctl(KVM_CREATE_VM) qemu_init_vcpu(vl.c) qemu_signalfd_compat(compatfd.c)

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kvm_init_vcpu(qemu-kvm.c) pthread_create##Signal Thread

pthread_create##VCPU Thread

                                                                           |
                                                        ap_main_loop(qemu-kvm.c)
                                                                           |
                                                       kvm_create_vcpu(qemu-kvm.c)
                                                                           |
                                                         ioctl(KVM_CREATE_VCPU)
QEMU threads code path:
io thread        --->   main_loop_wait(vl.c)             --> select
vcpu thread    ---> ap_main_loop(qemu-kvm.c)   --> kvm_main_loop_cpu
signal thread --->   sigwait_compat(compatfd.c) --> sigwaitinfo
QEMU timer emulation path:

main(vl.c) ---> init_timer_alarm(vl.c) ---> dynticks_start_timer ---> sigaction(SIGALARM, host_alarm_handler) --> timer_create

(or ---> hpet_start_timer ---> open(/dev/hpet) ---> enable_sigio_timer --> sigaction(SIGIO, host_alarm_handler)