Virt-RC System

Virt-RC(Virtual but Real Career) system describes my career more clearly. It's kind of developer's note or companion system of the resume.
This system consists of two parts - QEMU (virtual device) and Linux ARM Guest OS (virtual driver and initramfs). QEMU and kernel are built based on ARM AARCH64. Buildroot is used for creating initramfs which includes the web server, 'lighttpd'.

How to Get a Prebuilt Image

Distribution channel is Docker. Please refer to the installation page if not installed.
The virt-rc system requires building not only QEMU but also kernel, so docker is a good option to release new built binaries as a snapshot.

You can pull docker image from docker hub.

$ docker pull virtrc/latest

This image includes virt-rc binaries and shell script file. Please note that this repository is ubuntu-based.

Alternatively, you may want to build docker image manually. Please use the Dockerfile and build it.
It takes much time to be completed. If you've already pulled the image, then please skip building the dockerfile.

$ docker build -t virtrc/latest .

How to Run Virt-RC

Before you run virt-rc system, you need to execute docker first.
Please type commands below. (Or you can use the script.)

$ xhost local:root
$ docker run -it \
    --net host \
    -v /tmp/.X11-unix:/tmp/.X11-unix \
    -e DISPLAY=unix$DISPLAY \
    virtrc/latest

Welcome! You just ran a container. It's time to go inside and take a look :)
Run virt-rc system by using the script.

root@milo-dev:/home/virtrc# ./run_virtrc.sh

This command runs QEMU for ARM aarch64 emulation. Please login as 'root' without password.

** VIRT-RC SYSTEM **
buildroot login: root

# uname -a
Linux buildroot 4.3.0 #58 SMP Thu Feb 11 23:30:57 KST 2016 aarch64 GNU/Linux

Now, you are in ARM system. Let's move to the sysfs of virt-rc device.

# cd /sys/devices/platform/b000000.virt_rc/	
# cat career
drivers android mainline qemu hw

Please select a category which you're interested in.

# echo "drivers" > career

Then, you will see the web page. You can type other values such like 'android', 'mainline', 'qemu' and 'hw'.

To quit the virt-rc system, press ctrl + a and c, then type 'quit' in (qemu) console. You need additional command - 'exit' to escape docker image.

How It Works

Whenever user (recruiter) requests the details of my career, virtual driver and device handle it. Virtual device opens the URL, then user can see my career page.

• Guest OS
  Kernel is ARM64. User-space is built from buildroot. Web server and some utilities are included in initramfs.
  The virt-rc driver requests the memory IO region and creates the sysfs named 'career' on initialization.
  As soon as a value is written to 'career', then virt-rc driver sends a command to virt-rc device in QEMU.
  This is memory map IO communication, so registers are implemented both in virtual driver and device.

  Source code: virt-rc driver

• Host
  Whenever IO read/write operation is requested from the guest, QEMU virt-rc device handles the command.
  In case a command is for opening URL, then virt-rc device runs a web browser and request a URL.
  Then, web server in the guest responds through the virtual network.

  Source code: virt-rc device