Main hypervisor

Debian 12

apt install --no-install-recommends qemu-system libvirt-clients libvirt-daemon-system
apt install --no-install-recommends qemu-utils
apt install --no-install-recommends openvswitch-switch

Kernel Same-page Merging (KSM)

https://www.kernel.org/doc/Documentation/vm/ksm.txt

apt install ksmtuned

hv:~# cat /sys/kernel/mm/ksm/max_page_sharing
256
hv:~# cat /sys/kernel/mm/ksm/pages_shared
57
hv:~# cat /sys/kernel/mm/ksm/pages_sharing
3289

libguestfs

https://libguestfs.org/

apt install libguestfs-tools