Hotplug Integration Tests

[ghost]

Changes

Add functional integration tests for vCPU hot-plugging

Reason

To ensure that everything works as intended

License Acceptance

By submitting this pull request, I confirm that my contribution is made under
the terms of the Apache 2.0 license. For more information on following Developer
Certificate of Origin and signing off your commits, please check
CONTRIBUTING.md.

PR Checklist

• If a specific issue led to this PR, this PR closes the issue.
• The description of changes is clear and encompassing.
• Any required documentation changes (code and docs) are included in this
  PR.
• API changes follow the Runbook for Firecracker API changes.
• User-facing changes are mentioned in CHANGELOG.md.
• All added/changed functionality is tested.
• New TODOs link to an issue.
• Commits meet
  contribution quality standards.

---

• This functionality cannot be added in rust-vmm.

[kanpov]

Will the hotplug features possibly land in 1.9?

[roypat]

Will the hotplug features possibly land in 1.9?

Hi @kanpov, thanks for your interest in the vcpu hotplugging feature!
We currently do not have an estimate of when/if hotplugging will be released, as we are still in a prototyping/researching phase to assess whether the feature would even have acceptable performance for Firecracker's usecase. Could you describe your usecase for hotplugging a bit more over in our tracking issue? That will help us with prioritization and assessment of the feature :)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.95%. Comparing base (a541725) to head (f050f98).

Additional details and impacted files

@@                  Coverage Diff                  @@
##           feature/vcpu-hotplug    #4704   +/-   ##
=====================================================
  Coverage                 81.95%   81.95%           
=====================================================
  Files                       257      257           
  Lines                     31762    31762           
=====================================================
  Hits                      26031    26031           
  Misses                     5731     5731           

Flag	Coverage Δ
5.10-c5n.metal	82.07% <ø> (ø)
5.10-m5n.metal	82.06% <ø> (+<0.01%)	⬆️
5.10-m6a.metal	81.38% <ø> (ø)
5.10-m6g.metal	79.21% <ø> (ø)
5.10-m6i.metal	82.06% <ø> (+<0.01%)	⬆️
5.10-m7g.metal	79.21% <ø> (ø)
6.1-c5n.metal	82.06% <ø> (-0.01%)	⬇️
6.1-m5n.metal	82.05% <ø> (ø)
6.1-m6a.metal	81.38% <ø> (ø)
6.1-m6g.metal	79.21% <ø> (ø)
6.1-m6i.metal	82.05% <ø> (ø)
6.1-m7g.metal	79.21% <ø> (ø)

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