multikernel: make IPI publication ordered and recoverable - #7
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Serialize shared-ring producers with a bounded owner-aware gate. Preserve FIFO publication and recover a gate only after its producer CPU is known to be parked. The gate and slot-state protocol change the private shared transport layout. Add an exact pre-launch layout and protocol check at this boundary, then require a transport initialization acknowledgment after both rings have been validated and before marking the instance active. Fail invalid manifests and missing acknowledgments closed. A spawn started by a host without the pre-launch check validates the boot-context anchor before using any shifted field and enters a local interrupt-disabled halt loop on mismatch without trusting shared park state or touching reset and APIC hardware. Signed-off-by: Nikolay Nikolaev <nicknickolaev@gmail.com>
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Summary
Compatibility
The private shared transport ABI is bumped to version 3. Host and spawn kernels validate the ABI magic, version, structure size, boot context, manifest layout, and initialization acknowledgment.
An incompatible host/spawn pairing is rejected before the instance becomes active.