Setting up KVM

1. Install libvirt Packages

   sudo pacman -S qemu libvirt edk2-ovmf virt-manager
   

2. Add user to libvirt groups

   sudo usermod -aG libvirt $USER
   sudo usermod -aG kvm $USER
   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. Define bridge network XML file, e.g. as br0.xml

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

6. Add bridge network to virt-manager

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

7. Disable COW on Btrfs (optional, recommended)

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