qemu cpu_exec -> cpu_init -> cpu_x86_init -> qemu_init_vcpu -> qemu_kvm_start_vcpu -> qemu_thread_create(qemu_kvm_cpu_thread_fn) -> kvm_cpu_exec -> kvm_vcpu_ioctl(KVM_RUN) -> ** block ** linux kernel kvm_vcpu_ioctl -> kvm_arch_vcpu_ioctl_r…