title: How to identify that you're running under a VM?
body: <p>Is there a way to identify, from within a VM, that your code is running inside a VM?</p>
  
  <p>I guess there are more or less easy ways to identify specific VM systems, especially if the VM has the provider's extensions installed (such as for VirtualBox or VMWare). But is there a general way to identify that you are not running directly on the CPU?</p>