Setting up LILO

In a nutshell

eventually rebuild your kernel, reduce boot-loader timeout to 3 seconds and eventually make linux fast again by disabling mitigations.

MWE

cat /etc/fstab
vi /etc/lilo.conf

lba32
timeout = 100
boot = /dev/vda
root = /dev/vda1
image = /boot/vmlinuz
    label = Linux
    read-only
    append = "ro mitigations=off"

re-write the boot-code

lilo
shutdown -r now

and check after reboot

uname -r
cat /proc/cmdline

Booting XEN with LILO

see mbootpack