./Enable-NestedVM.ps1
param([string]$vmName)
# Enable-NestedVm.ps1
# Checks VM for nesting comatability and configures if not properly setup.
# Author: Drew Cross
if([string]::IsNullOrEmpty($vmName)) {
Write-Host “No VM name passed”
Exit;
}
# Constants
$4GB = 4294967296
# Need to run elevated. Do that here.
# Get the ID and security principal of the current user account
$myWindowsID = [System.Security.Principal.WindowsIdentity]::GetCurrent();
$myWindowsPrincipal=New-Object System.Security.Principal.WindowsPrincipal($myWindowsID);
# Get the security principal for the administrator role
$adminRole = [System.Security.Principal.WindowsBuiltInRole]::Administrator;
# Check to see if we are currently running as an administrator
if ($myWindowsPrincipal.IsInRole($adminRole)) {
# We are running as an administrator, so change the title and background colour to indicate this
$Host.UI.RawUI.WindowTitle = $myInvocation.MyCommand.Definition + “(Elevated)”;
} else {
# We are not running as an administrator, so relaunch as administrator
# Create a new process object that starts PowerShell
$newProcess = New-Object System.Diagnostics.ProcessStartInfo “PowerShell”;
# Specify the current script path and name as a parameter with added scope and support for scripts with spaces in it’s path
$newProcess.Arguments = “& ‘” + $script:MyInvocation.MyCommand.Path + “‘”
# Indicate that the process should be elevated
$newProcess.Verb = “runas”;
# Start the new process
[System.Diagnostics.Process]::Start($newProcess) | Out-Null;
# Exit from the current, unelevated, process
Exit;
}
# Get Vm Information
$vm = Get-VM -Name $vmName
$vmInfo = New-Object PSObject
# VM info
Add-Member -InputObject $vmInfo NoteProperty -Name “ExposeVirtualizationExtensions” -Value $false
Add-Member -InputObject $vmInfo NoteProperty -Name “DynamicMemoryEnabled” -Value $vm.DynamicMemoryEnabled
Add-Member -InputObject $vmInfo NoteProperty -Name “SnapshotEnabled” -Value $false
Add-Member -InputObject $vmInfo NoteProperty -Name “State” -Value $vm.State
Add-Member -InputObject $vmInfo NoteProperty -Name “MacAddressSpoofing” -Value ((Get-VmNetworkAdapter -VmName $vmName).MacAddressSpoofing)
Add-Member -InputObject $vmInfo NoteProperty -Name “MemorySize” -Value (Get-VMMemory -VmName $vmName).Startup
# is nested enabled on this VM?
$vmInfo.ExposeVirtualizationExtensions=(Get-VMProcessor-VM $vm).ExposeVirtualizationExtensions
Write-Host “This script will set the following for $vmName in order to enable nesting:”
$prompt = $false;
# Output text for proposed actions
if ($vmInfo.State -eq ‘Saved’) {
Write-Host “\tSaved state will be removed”
$prompt = $true
}
if ($vmInfo.State -ne ‘Off’ -or $vmInfo.State -eq ‘Saved’) {
Write-Host “Vm State:” $vmInfo.State
Write-Host ” $vmName will be turned off”
$prompt = $true
}
if ($vmInfo.ExposeVirtualizationExtensions -eq $false) {
Write-Host ” Virtualization extensions will be enabled”
$prompt = $true
}
if ($vmInfo.DynamicMemoryEnabled -eq $true) {
Write-Host ” Dynamic memory will be disabled”
$prompt = $true
}
if($vmInfo.MacAddressSpoofing -eq ‘Off’){
Write-Host ” Optionally enable mac address spoofing”
$prompt = $true
}
if($vmInfo.MemorySize -lt $4GB) {
Write-Host ” Optionally set vm memory to 4GB”
$prompt = $true
}
if(-not $prompt) {
Write-Host ” None, vm is already setup for nesting”
Exit;
}
Write-Host “Input Y to accept or N to cancel:” -NoNewline
$char = Read-Host
while(-not ($char.StartsWith(‘Y’) -or $char.StartsWith(‘N’))) {
Write-Host “Invalid Input, Y or N”
$char = Read-Host
}
if($char.StartsWith(‘Y’)) {
if ($vmInfo.State -eq ‘Saved’) {
Remove-VMSavedState -VMName $vmName
}
if ($vmInfo.State -ne ‘Off’ -or $vmInfo.State -eq ‘Saved’) {
Stop-VM -VMName $vmName
}
if ($vmInfo.ExposeVirtualizationExtensions -eq $false) {
Set-VMProcessor -VMName $vmName -ExposeVirtualizationExtensions $true
}
if ($vmInfo.DynamicMemoryEnabled -eq $true) {
Set-VMMemory -VMName $vmName -DynamicMemoryEnabled $false
}
# Optionally turn on mac spoofing
if($vmInfo.MacAddressSpoofing -eq ‘Off’) {
Write-Host “Mac Address Spoofing isn’t enabled (nested guests won’t have network).” -ForegroundColor Yellow
Write-Host “Would you like to enable MAC address spoofing? (Y/N)” -NoNewline
$input = Read-Host
if($input -eq ‘Y’) {
Set-VMNetworkAdapter -VMName $vmName -MacAddressSpoofing on
}
else {
Write-Host “Not enabling Mac address spoofing.”
}
}
if($vmInfo.MemorySize -lt $4GB) {
Write-Host “VM memory is set less than 4GB, without 4GB or more, you may not be able to start VMs.” -ForegroundColor Yellow
Write-Host “Would you like to set Vm memory to 4GB? (Y/N)” -NoNewline
$input = Read-Host
if($input -eq ‘Y’) {
Set-VMMemory -VMName $vmName -StartupBytes $4GB
}
else {
Write-Host “Not setting Vm Memory to 4GB.”
}
}
Exit;
}
if($char.StartsWith(‘N’)) {
Write-Host “Exiting…”
Exit;
}
Write-Host ‘Invalid input’

El script anterior está extraído de la fuente:

https://github.com/MicrosoftDocs/Virtualization-Documentation/blob/master/hyperv-tools/Nested

Ten en cuenta que la Virtualización anidada/nested no se debe utilizar en ningún entorno de producción, solo para pruebas, el rendimiento en general cae bastante.