vcpu_get_state
state = vcpu_get_state(vcpu, NULL);
state = vcpu_get_state(vcpu, NULL);
state = vcpu_get_state(vcpu, &hostcpu);
int state = vcpu_get_state(vcpu, NULL);
enum vcpu_state vcpu_get_state(struct vcpu *vcpu, int *hostcpu);
return (vcpu_get_state(vcpu, hostcpu) == VCPU_RUNNING);