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HowTo: Install XEN Dom0 on Debian Buster from source
This article assumes you have a clean install of Debian and have root level access to the server. Note this was performed on a minimal install with no desktop.
Prereqs
To be able to perform a successful kernel build, you will need to install the following packages:
apt-get install bc bcc bin86 gawk bridge-utils iproute libcurl4 libcurl4-openssl-dev bzip2 module-init-tools transfig texinfo texlive-latex-base gcc-multilib texlive-fonts-extra texlive-fonts-recommended pciutils-dev mercurial libncurses5-dev patch libvncserver-dev libsdl-dev gettext libaio1 libaio-dev libssl-dev iasl libbz2-dev git-core uuid-dev python python-dev python-twisted build-essential make gcc libc6-dev zlib1g-dev texlive-latex-recommended e2fslibs-dev libyajl-dev libpixman-1-dev liblzma-dev flex bison
XEN Compile and install
Now lets get the XEN tarball and make XEN
cd /usr/src
wget https://downloads.xenproject.org/release/xen/4.13.0/xen-4.13.0.tar.gz
tar xvf xen-4.13.0.tar.gz
cd xen-4.13.0
./configure -enable-githttp -libdir=/usr/lib
make -j 5 xen
make -j 5 tools
make -j 5 stubdom
cd dist/install
cp -R * /
vi /etc/default/xendomains and comment out #XENDOMAINS_SAVE=/var/lib/xen/save
These tweeks should make XEN start at system startup and also create the bridge we need for the DomUs. Please note that rc3.d could be rc2.d depending on your runlevel, check with the command runlevel at the prompt.
ln -s /etc/init.d/xendomains /etc/rc0.d/S10xendomains
ln -s /etc/init.d/xendomains /etc/rc6.d/S10xendomains
ln -s /etc/init.d/xencommons /etc/rc3.d/S98xencommons
ln -s /etc/init.d/xendomains /etc/rc3.d/S98xendomains
ln -s /root/xendom0caps /etc/rc3.d/S98xendom0caps
ln -s /root/iptables-enable /etc/rc3.d/S99iptables-enable (not required)
vi /root/xendom0caps (add xl sched-credit -d Domain-0 -w 512)
chmod +x /root/xendom0caps
vi /etc/rc.local (add /usr/bin/setterm -powersave off -blank 0
vi /etc/xen/xend-config.sxp
find line (network-script network-bridge) and comment out
#network-script network-bridge
vi /etc/xen/xl.conf (disable autoballon)
autoballon=0
Interfaces
As newer versions of XEN can use the system bridge rather than its own script we need to edit the network configuration to invoke our new bridge. Firstly create our new bridge interface. Replace the IP values with your settings.
vi /etc/network/interfaces
auto xenbr0
iface xenbr0 inet static
bridge_ports eth0
address 172.20.45.1
netmask 255.255.0.0
network 172.20.0.0
broadcast 172.20.255.255
gateway 172.20.0.1
Once done reboot to ensure the config applies successfully.
Kernel Compile
Now XEN is complete we need to get our kernel for Dom0. Replace the kernel number with the version you want to use.
cd /usr/src
(Please note the kernel version maybe significantly newer than detailed here)
wget https://cdn.kernel.org/pub/linux/kernel/v5.x/linux-5.0.10.tar.xz
tar xvf linux-5.0.10.tar.xz
cd linux-5.0.10
make menuconfig
Go into Processor type and features
Statically enable all XEN features
Go back to the main menu and enter Device Drivers menu, then enter block devices menu
Statically enable the 2 XEN options
Go back to the Device Drivers menu and go down to XEN driver support
Statically enable all features
Go back to Device Drivers, go into Network device support and statically enable the 2 XEN options at the bottom
Exit out and save.
Note to make sure all options are selected run
cat /usr/src/linux-4.12.3/.config | grep XEN
You should see the same as
CONFIG_XEN=y
CONFIG_XEN_DOM0=y
CONFIG_XEN_PRIVILEGED_GUEST=y
CONFIG_XEN_PVHVM=y
CONFIG_XEN_MAX_DOMAIN_MEMORY=500
CONFIG_XEN_SAVE_RESTORE=y
CONFIG_XEN_DEBUG_FS=y
CONFIG_PCI_XEN=y
CONFIG_XEN_PCIDEV_FRONTEND=y
CONFIG_XEN_BLKDEV_FRONTEND=y
CONFIG_XEN_BLKDEV_BACKEND=y
CONFIG_NETXEN_NIC=m
CONFIG_XEN_NETDEV_FRONTEND=y
CONFIG_XEN_NETDEV_BACKEND=y
CONFIG_INPUT_XEN_KBDDEV_FRONTEND=y
CONFIG_HVC_XEN=y
CONFIG_HVC_XEN_FRONTEND=y
# CONFIG_XEN_WDT is not set
CONFIG_XEN_FBDEV_FRONTEND=y
CONFIG_XEN_BALLOON=y
CONFIG_XEN_BALLOON_MEMORY_HOTPLUG=y
CONFIG_XEN_SCRUB_PAGES=y
CONFIG_XEN_DEV_EVTCHN=y
CONFIG_XEN_BACKEND=y
CONFIG_XENFS=y
CONFIG_XEN_COMPAT_XENFS=y
CONFIG_XEN_SYS_HYPERVISOR=y
CONFIG_XEN_XENBUS_FRONTEND=y
CONFIG_XEN_GNTDEV=y
CONFIG_XEN_GRANT_DEV_ALLOC=y
CONFIG_SWIOTLB_XEN=y
CONFIG_XEN_PCIDEV_BACKEND=y
CONFIG_XEN_PRIVCMD=y
CONFIG_XEN_ACPI_PROCESSOR=y
If it looks good then continue otherwise please correct before hand.
make -j 5 bzImage
make -j 5 modules
make -j 5 INSTALL_MOD_STRIP=1 modules_install
cp -a arch/x86/boot/bzImage /boot/vmlinuz-5.0.10
cp -a System.map /boot/System.map-5.0.10
cp -a .config /boot/config-5.0.10
depmod -a
mkinitramfs -o /boot/initrd.img-5.0.10 5.0.10
Modify GRUB2 to boot in XEN mode
cd /etc/grub.d
mv 10_linux 50_linux
vi /etc/default/grub
add these lines under GRUB_CMDLINE_Linux””
GRUB_CMDLINE_XEN_DEFAULT=dom0_mem=1024M,max:1024M
GRUB_CMDLINE_XEN=
save and exit
now issue
update-grub
reboot once complete.
