[codex] add Darwin virtio balloon support#42
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Summary
Adds a Darwin/arm64 virtio-balloon MVP and exposes the balloon target as explicit API configuration via
balloon_mb.The device implements the basic virtio balloon inflate/deflate queues, snapshots its MMIO/config state, and reclaims Darwin HVF guest pages with
MADV_FREE. Darwin runtime requests now loadvirtio_balloonand wire the device into FDT/MMIO for one-shot, persistent, and snapshot restore paths.This also adds typed ccvmd request-normalization hooks for create/start/run requests so embedders like vmsh can apply policy after request decoding without rewriting HTTP bodies.
Validation
go test -tags embed_guestinit ./internal/vm -run TestRuntimeBootsLinuxWithHVFBalloon -count=1 -timeout 10mgo test ./ccvmd ./internal/ccvmd ./internal/vm -count=1go test -short ./... -count=1 -timeout 30mgit diff --check