KVM Setup on Arch

Basic installation

sudo pacman -S --needed qemu virt-manager virt-viewer dnsmasq vde2 bridge-utils openbsd-netcat ebtables iptables
sudo yay -S --needed libguestfs
sudo systemctl enable --now libvirtd.service

Enable normal user account to use KVM

sudo micro /etc/libvirt/libvirtd.conf

Uncomment these lines:

unix_sock_group = "libvirt"
unix_sock_rw_perms = "0770"

Back to shell:

sudo usermod -a -G libvirt $(whoami)
newgrp libvirt
sudo systemctl restart libvirtd.service

In my test we need more configuration to not get a laggy 2D experience, even on Manjaro KDE.