Set-VmNestedHVStatus.ps1

function Set-VmNestedHVStatus {
    param($VM,[bool]$NestedHVStatus)
    foreach ($item in $VM) {
        try {
            $vm = Get-VM $item
            $spec = New-Object -TypeName VMware.Vim.VirtualMachineConfigSpec
            $spec.ChangeVersion = $vm.ExtensionData.Config.ChangeVersion
            $spec.NestedHVEnabled = $NestedHVStatus
            $vm.ExtensionData.ReconfigVM($spec)
        } catch {
            Write-Warning -Message $_
        }
    }
}