en:xu4_xen [ODROID Wiki]

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====== Virtualization using Xen on ODROID-XU3/4 ======
This page contains the **step-by-step guide for virtualization** using Xen on ODROID-XU3/4. 

**//HOST-PC Environments://**
  * Ubuntu 14.04 LTS Desktop
  * Toochain: [[https://releases.linaro.org/14.09/components/toolchain/binaries/gcc-linaro-arm-none-eabi-4.9-2014.09_linux.tar.xz|arm-none-eabi-, Linaro 4.9-2014.09]]
  * SD card device name assumption: /dev/sdc
  * SD card mount point assumption: /media/boot, /media/rootfs

===== Basic preparation =====
SD card or eMMC basic platform preparation:
<code>
$ wget http://odroid.in/ubuntu_14.04lts/ubuntu-14.04lts-server-odroid-xu3-20150725.img.xz
$ unxz ubuntu-14.04lts-server-odroid-xu3-20150725.img.xz
$ sudo dd if=ubuntu-14.04lts-server-odroid-xu3-20150725.img of=/dev/sdc bs=1M conv=fsync
$ sync
</code>

===== Bootloader =====
Bootloader must enable HYP mode to support virtualization before jump to kernel. So, it is needed to reinstall bootloader.

Install Bootloader to support HYP mode:
<code>
$ git clone https://github.com/hardkernel/u-boot.git -b odroidxu3-v2012.07
$ cd u-boot
$ make odroid_config
$ make ARCH=arm CROSS_COMPILE=arm-none-eabi- -j8
$ cd sd_fuse/hardkernel
$ sudo ./sd_fusing.sh /dev/sdc
$ sync
</code>

Changing [[http://git.io/vCu3c|boot.ini]] file for virtualization:
<code>
$ wget http://git.io/vCu3c -O boot.ini
$ sudo cp -f boot.ini /media/boot/
$ sync
</code>

<WRAP left round important 100%>
Note: Please follow [[http://odroid.com/dokuwiki/doku.php?id=en:emmc_recovery_xu3|XU3/XU4 eMMC Bootloader Recovery wiki page]] to burn the bootloader to eMMC. 
</WRAP>
===== Xen Hypervisor =====
Getting the xen soruce code:
<code>
$ git clone https://github.com/bkrepo/xen.git -b odroid-xu4
$ cd xen
</code>

Build & Installation:
<code>
$ make dist-xen CROSS_COMPILE=arm-none-eabi- XEN_TARGET_ARCH=arm32 debug=y CONFIG_EARLY_PRINTK=exynos5250 -j8
$ sudo cp xen/xen /media/boot/
$ sync
</code>

===== Domain 0 Linux kernel =====
Build & Installation:
<code>
$ git clone https://github.com/bkrepo/linux-dom0.git
$ cd linux-dom0
$ make odroidxu3_xen_defconfig ARCH=arm
$ make ARCH=arm CROSS_COMPILE=arm-none-eabi- -j8
$ sudo make modules_install ARCH=arm INSTALL_MOD_PATH=/media/rootfs/
$ cp -f arch/arm/boot/zImage arch/arm/boot/dts/exynos5422-odroidxu3.dtb /media/boot/
$ sync
</code>

===== Domain 0 Settings =====
<WRAP left round tip 70%>
 **Note**
  * This step must be done on **ODROID-XU3/4** (id: //root//, password: //odroid//)
</WRAP>

==== Xen tools installation====
Getting the xen source code:
<code>
$ git clone https://github.com/bkrepo/xen.git -b odroid-xu4
$ cd xen
</code>

Installation packages for xen tools build:
<code>
$ apt-get update
$ apt-get build-dep xen
$ apt-get install libpixman-1-dev
</code>

Building xen tools:
<code>
$ ./configure --disable-xen --disable-docs
$ make dist-tools -j4
$ make install-tools
$ update-rc.d xencommons defaults 19 18
$ update-rc.d xendomains defaults 21 20
$ update-rc.d xen-watchdog defaults 22 23
$ ldconfig
</code>

==== Network configuration ====
DHCP bridge network configuration:
<code>
$ apt-get install bridge-utils
$ vim /etc/network/interfaces.d/xenbr0
</code>
<code - xenbr0>
auto xenbr0 inet
iface xenbr0 inet dhcp
bridge_ports eth0
</code>

* //If you want more information about Xen networking, then refer to [[http://wiki.xenproject.org/wiki/Network_Configuration_Examples_(Xen_4.1%2B)|this link. ]]//

===== Domain U Settings && Running =====
**(On HOST-PC)**

Domain U kernel build preparation:
<code>
$ wget https://www.kernel.org/pub/linux/kernel/v4.x/linux-4.2.tar.xz
$ tar Jxvf linux-4.2.tar.xz
$ cd linux
$ make exynos_defconfig ARCH=arm
$ make menuconfig ARCH=arm
</code>
  - Kernel Features -> Xen guest support on ARM
  - Device Drivers -> Block devices -> Xen virtual block device support.
  - Device Drivers -> Network device support -> Xen network device frontend
  - Device Drivers -> Xen driver support -> Select all.
  - System Type -> ARM system type -> Allow multiple platforms to be selected.
  - System Type -> Multiple platform selection -> ARMv7 based platforms
  - System Type -> Dummy Virtual Machine.
  - Device Drivers -> Input Device support -> Miscellaneous devices -> Xen virtual keyboard and mouse support.

Patching Domain U kernel source code:
<code>
$ wget http://git.io/vCV9E -O xen_blkif.patch
$ patch -p1 < xen_blkif.patch
</code>

Build & Installation:
<code>
$ make ARCH=arm CROSS_COMPILE=arm-none-eabi- zImage -j8
$ sudo cp arch/arm/boot/zImage /media/rootfs/root/
$ sync
</code>

Creating the [[http://odroid.in/ubuntu_14.04lts/ubuntu-14.04lts-server-odroid-xu3-20150725.img.xz|domain U image(Ubuntu 14.04 server)]]:
<code>
$ sudo kpartx -v -a ubuntu-14.04lts-server-odroid-xu3-20150725.img
$ sudo dd if=/dev/mapper/loop0p2 of=domU.img
</code>

Modifiying domain U root file system
<code>
$ mkdir domU-root
$ sudo mount domU.img domU-root
$ cd domU-root
$ vi ./etc/fstab
</code>
<code - /etc/fstab>
/dev/xvda    /    ext4    errors=remount-ro    0    1
</code>

<code>
$ vi ./etc/init/console.conf
</code>
<code - /etc/init/console.conf>
start on stopped rc RUNLEVEL=[2345]
stop on runlevel [!2345]

respawn
exec /sbin/getty -8 38400 hvc0
</code>

<code>
$ cd ..
$ sudo umount domU-root
$ sudo cp domU.img /media/rootfs/root/
$ sync
</code>

Create the xen configuration file:
<code>
$ vi domU.cfg
</code>
<code - domU.cfg>
kernel = "/root/zImage"
memory = 256
maxmem = 256
name = "Domain U"
vcpus = 1
cpus = ['1']
serial="pty"
disk = [ 'phy:/root/domU.img,xvda,w' ]
vif = ['bridge=xenbr0']
extra = 'console=hvc0 xencons=tty root=/dev/xvda rw'
</code>
<code>
$ sudo cp domU.cfg /media/rootfs/root/
$ sync
</code>

Running virtual machine(**On ODROID-XU3/4**, id: 'root', passwd: 'odroid'):
<code>
# xl create -c domU.cfg
</code>

Checking the domain list.
<code>
(Type the 'CTRL + x + ]' key -> Escaping Domain U, Moving to Domain 0 console.)
root@odroid-server:~# xl list
Name                                        ID   Mem VCPUs      State   Time(s)
Domain-0                                     0   800     4     r-----     534.3
Domain U                                     1   256     1     -b----      49.9
root@odroid-server:~#
</code>
===== References =====
  * [[http://forum.odroid.com/viewtopic.php?f=98&t=6643|Related Topic in ODROID Forum]]
  * [[http://wiki.xenproject.org/wiki/Xen_ARM_with_Virtualization_Extensions/OdroidXU|Xen ARM with Virtualization Extensions/OdroidXU]]
  * [[https://github.com/cypresskr/xen|cypresskr's xen repository]]
  * [[https://github.com/suriyanr/linux-xen/tree/odroidxu3-3.10.y|suriyanr's domain 0 linux kernel repository]]