Asset Management and AWS instances.

We are starting to use AWS for some of our applications or as replacement for physical servers. We are wondering how others are managing the assets when they are AWS instances. Are you handling them like VMWare/ESX Virtual Machines or as just physical servers or leaving them as "workstation". There really is no clear option on this. As there is no VM HOST that we know of hosting our AWS Instances, just a REGION. So marking them as Virtual Machines is not quite right, but they are also not physical so putting them in as physical server is not quite right either.

Any suggestions on how to handle AWS Instances in our CMDB and Asset Inventory?

We use both AssetExplorer and ServiceDesk Plus. Just wondering if others are running into this issue and what their workaround solution might be.