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# Login as super user
sudo -i

# Check for the following parameter
cat /sys/module/kvm_intel/parameters/nested
N
# If it is Y, there is nothing else to be done. It is already enabled!

# If it is N, do the following:
# Edit /etc/default/grub file, and include kvm-intel.nested=1
GRUB_CMDLINE_LINUX parameter
GRUB_CMDLINE_LINUX="crashkernel=auto
console=ttyS0,38400n8,kvm-intel.nested=1"

# Rebuild your GRUB configuration
sudo grub2-mkconfig -o /boot/grub2/grub.cfg

# Enable nested KVM capabilities in /etc/modprobe.d/kvm.conf
# By uncommenting the below line

options kvm_intel nested=1

### Reboot the server
reboot

# Now, we should have the nested KVM capabilities enabled
cat /sys/module/kvm_intel/parameters/nested
Y