KVM

KVM (Kernel-based Virtual Machine) is a hypervisor built into the Linux kernel.

1. Install libvirt Packages

   yay -S qemu libvirt edk2-ovmf virt-manager nfs-utils virtio-win
   
   # optional dependencies
   iptables-nft dnsmasq   # for default NAT/DHCP networking
   bridge-utils           # for bridged networking
   openbsd-netcat         # for remote management over SSH
   

2. Add user to libvirt groups

   sudo usermod -aG libvirt,kvm,input $USER
   

3. Start libvirtd daemon

   sudo systemctl enable --now libvirtd
   

4. Create network bridge with nmcli

   nmcli connection add type bridge ifname br0 con-name "Netzwerkbrücke" stp no
   nmcli connection add type bridge-slave ifname enp39s0 con-name "Ethernet" master br0
   nmcli connection down "Kabelgebundene Verbindung 1"
   nmcli connection up "Netzwerkbrücke"
   
5. When using bonding of interfaces, disable IPv4 and IPv6 on the bridge

   nmcli con mod "Netzwerkbrücke" ipv4.method disabled ipv6.method ignore 
   

Define bridge network XML file, e.g. as br0.xml

<network>
  <name>br0</name>
  <forward mode='bridge'/>
  <bridge name='br0'/>
</network>

Add bridge network to virt-manager

virsh -c qemu:///system net-define br0.xml
virsh -c qemu:///system net-autostart br0

Disable COW on Btrfs (optional, recommended)

sudo chattr +C /var/lib/libvirt/images