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Certainly! Let's unravel the secrets of nested virtualization inside a virt-7.2 ARM virtual machine. 🌟

  1. What's Nested Virtualization?:

    • Imagine it as a set of magical mirrors: you have a virtual machine (VM) inside another VM. It's like dreams within dreams!
    • Nested virtualization lets you run a hypervisor (like Hyper-V or KVM) inside a VM. Why? Well, sometimes wizards need more wizards, right? 🧙‍♂️

  2. Hyper-V on Windows (Intel/AMD):

    • If you're in the Windows realm, follow these steps:
      • Prerequisites:
      • Intel processor with VT-x and EPT (or AMD EPYC/Ryzen processor).
      • Hyper-V host: Windows Server 2016 or later, or Windows 10 or later.
      • VM configuration version 8.0 or higher (important for time travel).
      • Enabling Nested Virtualization:
      • While your VM is OFF, run this spell on the physical Hyper-V host: Set-VMProcessor -VMName <VMName> -ExposeVirtualizationExtensions $true
      • Start your VM and install Hyper-V inside it (like setting up a magical workshop).
      • Networking Options:
      • You can either use MAC address spoofing (for secret tunnels between VMs) or NAT (like a magical translator).
      • For MAC address spoofing, enable it on the first-level virtual switch.
      • For NAT, create a virtual NAT switch in the middle VM (like a cosmic bridge).

  3. KVM on Linux (ARM):

    • If you're exploring the Linux galaxy, here's the path:
      • Prerequisites:
      • ARM processor (your little dragon heart).
      • VM running on QEMU/KVM (the ancient scrolls).
      • Enabling Nested Virtualization:
      • First, configure your kernel image to support virtualization (set CONFIG_VIRTUALIZATION=y).
      • Then, activate the nesting feature: sudo modprobe kvm_amd nested=1
      • This magic lasts until your host reboots. To make it permanent, inscribe it in /etc/modprobe.d/kvm.conf.

  4. Remember the VMs' Feelings:

    • Nested VMs are like enchanted dreams—they need care and attention.
    • Don't overload them with too many vCPUs (keep it under 225 for Windows Server 2019).
    • And always say “Abracadabra” when starting them. Just kidding! 😄

So, whether you're in the Windows castle or the Linux forest, nested virtualization awaits! 🏰🌳

If you need more magical tips or have other curious questions, just wave your wand (or type)! 🪄🔮¹²³.

Is there anything else you'd like to explore in the virtual realms? 🌟🤓

Source: Conversation with Copilot, 7/21/2024 (1) Run Hyper-V in a Virtual Machine with Nested Virtualization. https://learn.microsoft.com/en-us/virtualization/hyper-v-on-windows/user-guide/enable-nested-virtualization. (2) How to enable nested virtualization in KVM :: Fedora Docs. https://docs.fedoraproject.org/en-US/quick-docs/using-nested-virtualization-in-kvm/. (3) Spawn a Linux virtual machine on Arm using QEMU (KVM). https://community.arm.com/oss-platforms/w/docs/510/spawn-a-linux-virtual-machine-on-arm-using-qemu-kvm.