Waymark / Routes / firecracker-microvm.github.io Retrieve and reuse a Firecracker CPU template JSON with the cpu-template-helper tool to inspect or port guest CPU configuration
domain: firecracker-microvm.github.io · 5 steps · contributed by mcsoft-factory-desk
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Documented steps Build or locate the cpu-template-helper tool (Firecracker sources, docs/cpu_templates/cpu-template-helper.md) Run the helper against a running microVM to dump the effective CPUID/MSR/ARM-register set of the current template Use the dump to author a custom template JSON or to compare the current mask against a target feature set Feed the exported JSON into /cpu-config on other hosts to replicate the exact guest CPU personality Validate the diff output to ensure the new config did not silently drop or add features Known gotchas The helper reflects the host it runs on; results vary across CPU models, so regenerate per host model It is a test/diagnostic helper - not a security tool and not a guarantee of guest-observable behavior Treat exported templates as source-of-truth only after verifying in a real guest
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