Define x0 and A in the matlab workspace. Here is the block diagram. Make sure to select matrix multiply for the gain blocks. Define x0 as the Initial Condition parameter for the integrator block (shown here) and also for the Delay block. Set the Sample Time parameter in the delay block to the appropriate value for your problem. Keep in mind that, in general, the continuous output and the discrete output will be very different when using the same A matrix for the feeback gain.
