shrinked single commit of github/wonseok/khypervisor v1->v1_vdev

# READ CAREFULLY!!

## This is single commit version of v1->v1_dev diff of your https://github.com/Wonseok/khypervisor
1. remove your 'v1_vdev' branch
2. create a new 'v1-vdev' branch from 'v1' (in your repo:https://github.com/Wonseok/khypervisor)
3. merge this request to your new 'v1-vdev' branch

This makes much easier to review your changes regarding virtual device emulation work so far