code: public Observable<Page<VirtualMachineInner>> listAsync() {
          return listWithServiceResponseAsync()
              .map(new Func1<ServiceResponse<Page<VirtualMachineInner>>, Page<VirtualMachineInner>>() {
                  @Override
                  public Page<VirtualMachineInner> call(ServiceResponse<Page<VirtualMachineInner>> response) {
                      return response.body();
                  }
              });
      }
docs: Lists all of the virtual machines in the specified subscription. Use the nextLink property in the response to get the next page of virtual machines.
  
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the observable to the PagedList&lt;VirtualMachineInner&gt; object