title: VIRTIO: How it increase performance
body: <p>I want to understand:</p>
  
  <ol>
  <li><p>How virtio driver increase performance compare to full virtualization or hw assisted virtualization (like virtio_net or virtio_blk )?</p></li>
  <li><p>How these virtio drivers affect VMEXIT/VMENTER or context switch between guest &amp; Hypervisor? </p></li>
  <li><p>What is the basic idea or architecture of virtio ?</p></li>
  </ol>
  
  <p>Thanks </p>