qemu笔记

来源：互联网发布：xampp linux 使用教程编辑：程序博客网时间：2024/05/24 00:16

先用qemu-system-arm -M ?看看支持哪些arm开发板，然后用qemu-system-arm -cpu ? -machine smdkc210选定一个开发板看看支持哪些cpu。

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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)

| |
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)

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