Ubuntu 21.04
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KVM : Nested KVM2021/05/10

Configure nested KVM.
It's possible to install KVM Hypervisor and create virtual machines as nested KVM on KVM host.
[1] Enable the setting for Nested KVM.
# show the current setting ( if the result is [Y], it's OK )

cat /sys/module/kvm_intel/parameters/nested

# if the result is [N], change like follows and reboot the system )

# specify [kvm_intel] for Intel CPU, specify [kvm_amd] for AMD CPU

echo 'options kvm_intel nested=1' >> /etc/modprobe.d/qemu-system-x86.conf
[2] Edit configuration of an existing virtual machine you'd like to set Nested like follows.
That's OK, it's possible to create virtual machine on GuestOS.
# edit config of a VM [ubuntu2104]

virsh edit ubuntu2104
# change [cpu mode] like follows

# if not go well, specify [host-passthrough]

<cpu mode='
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