[Feature Request] Create integration test for testing snapshot restore on CPUs with different TSC frequencies.

[alsrdn]

Feature Request

Create integration test for testing snapshot restore on CPUs with different TSC frequencies.

Describe the desired solution

Create a integration test to validate this code: https://github.com/firecracker-microvm/firecracker/blob/f2f8802122cf20fa043600290dcc938c96b9611d/src/vmm/src/builder.rs#L482

Describe possible alternatives

We need 2 things for this:

• a snapshot saved on S3 on a CPU that has a certain TSC frequency
• an integration test that is being run on a CPU with a different frequency

[Author TODO: How do you work around not having this feature?]

Additional context

[Author TODO: Add additional context about this feature request here.]

Checks

• [x] Have you searched the Firecracker Issues database for similar requests?
• [x] Have you read all the existing relevant Firecracker documentation?
• [x] Have you read and understood Firecracker's core tenets?

[roypat]

We have tests for restoring snapshots across different x86_64 CPU models in https://github.com/firecracker-microvm/firecracker/blob/main/.buildkite/pipeline_cross.py, however we do not specifically exercise any TSC related functionality. I'm marking this issue as Parked, as we also do not plan to investigate this further at the moment.

[wearyzen]

Cover negative test cases as mentioned in #2624