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Stage 1: Platform Attestation and Safe Hypervisor Launch

This initial stage provides a basic assurance of platform trustworthiness and enables faster detection of security issues. There are three steps to this stage:

1. Configure the server. Set up the cloud server platform as being trusted, including configuring the hardware, BIOS, and hypervisor.

2. Verify the hypervisor. Before each hypervisor launch, verify the trustworthiness of the cloud server platform set up in the previous step. Remote attestation is the way the integrity of the launch of the platform is verified.

3. Continually monitor the hypervisor. During execution, frequently repeat the measurements done in step 2 to continually ensure trustworthiness. These measurements should then become an ongoing part of a continuous monitoring process.

Stage 2: Trust-Based Secure Migration

Ensure that workloads are deployed and then are migrated only among trusted server platforms within the cloud. There are two steps to this stage:

1. Deploy to trusted platforms. Apply the verification tests established in stage 1, step 3 and only deploy a workload to those platforms deemed trustworthy.

2. Migrate to trusted platforms. Once a workload is deployed, ensure that it migrates only to hosts with comparable trust levels. This is determined by applying the verification tests from stage 1, step 3 on both the workload's current server and the server to migrate the workload to. Migration is allowed only if both servers pass their audits.

Stage 3: Trustand Geolocation-Based Secure Migration

Build on previous stage by ensuring that workloads migrate only to trusted server platforms while also taking geolocation restrictions into consideration. There are three steps to this stage:

1. Verify geolocation information. Ensure that any platform to be included in the trusted geolocation pool has its geolocation set as part of its initial configuration in stage 1, step 1. This is a cryptographic hash within the hardware cryptographic module in BIOS. Ensure that the geolocation information can be verified and audited readily.

2. Enforce geolocation restrictions. Add a geolocation check to the pre-deployment and pre-migration verification in stage 2, steps 2 and 3 before deploying or migrating a workload.

3. Add geolocation to monitoring. Add geolocation checks to the continuous monitoring put in place in stage 1, step 3 to ensure trustworthiness of the platforms. This process should audit the geolocation of the cloud server platform against geolocation policy restrictions.

 
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