KVM : Nested KVM2023/06/20

	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 )

root@dlp:~#

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

root@dlp:~#

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 [debian12]

root@dlp:~#

virsh edit debian12

# change [cpu mode] like follows

<cpu mode='

host-passthrough

' check='none' migratable='on'/>

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