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Install Qemu-Kvm

Install all necessary packages

sudo pacman -S virt-manager virt-viewer qemu edk2-ovmf vde2 ebtables dnsmasq bridge-utils openbsd-netcat libguestfs dmidecode

Enable libvirt daemon

systemctl enable libvirtd.service
systemctl start libvirtd.service

Create bridge interface

sudo nvim br10.xml

Inside the new file copy and paste, you can change the ip address to your like

<network>
  <name>br10</name>
  <forward mode='nat'>
    <nat>
      <port start='1024' end='65535'/>
    </nat>
  </forward>
  <bridge name='br10' stp='on' delay='0'/>
  <ip address='192.168.30.1' netmask='255.255.255.0'>
    <dhcp>
      <range start='192.168.30.50' end='192.168.30.200'/>
    </dhcp>
  </ip>
</network>

Define and autostart network bridge

sudo virsh net-define br10.xml
sudo virsh net-start br10
sudo virsh net-autostart br10

Enable normal user account to use KVM

Open libvirtd.conf file

sudo nvim /etc/libvirt/libvirtd.conf

Then change and un-comment this lines

unix_sock_group = "libvirt"
unix_sock_ro_perms = "0777"
unix_sock_rw_perms = "0770"

Add current user to kvm and libvirt groups

sudo usermod -a -G kvm $(whoami)
sudo usermod -a -G libvirt $(whoami)
newgrp libvirt

Enable nested virtulization (optional)

sudo modprobe -r kvm_intel
sudo modprobe kvm_intel nested=1
echo "options kvm-intel nested=1" | sudo tee /etc/modprobe.d/kvm-intel.conf

verify nested virtualization

systool -m kvm_intel -v | grep nested
cat /sys/module/kvm_intel/parameters/nested

If everything is ok you need to logout o reboot you computer

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