Can I not run Xen hypervisor in a bare-metal instance?

Hi,

I am trying to run my own Xen hypervisor in a bare-metal instance. I tried two things:

1. Create a regular Linux bare-metal instance, and then build and install Xen from source code in the instance.
2. Create a AMI containing Xen hypervisor from Virtualbox and import it to an AWS bare-metal instance.

Both failed with status "1/2 checks passed". I am wondering what I missed.

Thank you.