main(vl.c)
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kvm_init(qemu-kvm.c) -> machine->init(pc_init_pci in ./hw/pc.c)-> main_loop(vl.c)
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kvm_create_context(qemu-kvm.c) pc_init1(pc.c) kvm_main_loop(q-k.c)->main_loop_wait
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kvm_create(qemu-kvm.c) pc_new_cpu(pc.c) qemu_signalfd(compatfd.c)
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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
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pthread_create##VCPU Thread
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ap_main_loop(qemu-kvm.c)
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kvm_create_vcpu(qemu-kvm.c)
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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)