Note that the KVM kernel side in Xenial does not support nested at all. The confusion is caused by the fact that something seems to create /dev/kvm even when running in a KVM VM. Nested KVM support in the kernel was added (but disabled by default) around Zesty (4.10 kernels).
Note that the KVM kernel side in Xenial does not support nested at all. The confusion is caused by the fact that something seems to create /dev/kvm even when running in a KVM VM. Nested KVM support in the kernel was added (but disabled by default) around Zesty (4.10 kernels).