[v1.14] Expose memory mapping & dirty pages; Make memfile dump optional#8
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bchalios wants to merge 4 commits intofirecracker-v1.14from
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[v1.14] Expose memory mapping & dirty pages; Make memfile dump optional#8bchalios wants to merge 4 commits intofirecracker-v1.14from
bchalios wants to merge 4 commits intofirecracker-v1.14from
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February 5, 2026 11:04
Add a few APIs to get information about guest memory: * An endpoint for guest memory mappings (guest physical to host virtual). * An endpoint for resident and empty pages. * An endpoint for dirty pages. Signed-off-by: Babis Chalios <babis.chalios@e2b.dev>
There are cases where a user might want to snapshot the memoyr of a VM externally. In these cases, we can ask Firecracker to avoid serializing the memory file to disk when we create a snapshot. Signed-off-by: Babis Chalios <babis.chalios@e2b.dev>
Implement API /memory/mappings which returns the memory mappings of guest physical to host virtual memory. Signed-off-by: Babis Chalios <babis.chalios@e2b.dev>
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Implement API /memory which returns two bitmaps: resident and empty. `resident` tracks whether a guest page is in the resident set and `empty` tracks whether it's actually all 0s. Both bitmaps are structures as vectors of u64, so their length is: total_number_of_pages.div_ceil(64). Pages are ordered in the order of pages as reported by/memory/mappings. Signed-off-by: Babis Chalios <babis.chalios@e2b.dev>
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how they are solving the problem in a clear and encompassing way.
in the PR.
CHANGELOG.md.Runbook for Firecracker API changes.
integration tests.
TODO.rust-vmm.