Module balloon 

/balloon, /balloon/statistics, /balloon/hinting/{op} bodies.

Per 21-api-compat-matrix.md /balloon PUT:

• amount_mib — 0..=mem_size_mib − 32 (matches upstream MAX_BALLOON_SIZE_MIB); the upper bound is host-RAM-dependent and validated at the controller.
• deflate_on_oom — bool default true (matches upstream).
• stats_polling_interval_s — 0..=255; 0 disables polling.
• free_page_hinting, free_page_reporting — bool defaults false.

Structs

BalloonConfig

Validated /balloon PUT body.

BalloonStatsUpdate

Validated /balloon/statistics PATCH body.

BalloonUpdate

Validated /balloon PATCH body.

RawBalloonConfig

Raw /balloon PUT body off the wire.

RawBalloonStatsUpdate

Raw /balloon/statistics PATCH body.

RawBalloonUpdate

Raw /balloon PATCH body.

Enums

BalloonHintingOp

PATCH /balloon/hinting/{op} operation kind. Each maps 1:1 to the URL path segment.

Constants

MAX_STATS_POLL_INTERVAL

Maximum stats_polling_interval_s per upstream. The wire field is a u8 so the type system enforces the cap; this constant exists to document the intent.