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FABRIC-3.10.8 MC-3a: the claim, the physics lock, per-core decision state

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VM.running_on claimed by compare-and-swap on switch-in and released once
the context is saved (release_after, sk_vm_switch_finish); a lost claim
returns 1 and the caller re-decides; double claims counted. Per-core
entry_vm and decision_due. g_lock_physics over capsule_vm_physics.c
(rank between switch and registry). KILL refuses a VM running anywhere.
Probe: 15737 claims, 0 lost, 0 double; a core-1 claim of Hera refused.
3-ISA acceptance with a 28-VM churn clean, 0 order violations.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
Robert Allan James
2026-09-26 15:35:05 -04:00
co-authored by Claude Opus 5.5
parent 2e3b7ebe66
commit 4440faf352
18 changed files with 37725 additions and 45 deletions
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include/starkernel/vm/switch.h
+9
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@@ -52,6 +52,15 @@ int sk_vm_context_switch(struct VM *from, struct VM *to);
* have entered an observer on a core other than core 0 (a guard; 0). */
uint64_t sk_vm_switch_observer_refusals(void);
/* FABRIC-3.10.8 MC-3a: the claim. sk_vm_try_claim() takes `vm` for this
* core (running_on 0 -> core_id + 1) by compare-and-swap: 1 if taken, 0 if
* another core holds it (counted as lost). sk_vm_context_switch() returns
* 1 when that happens to `to` -- nothing switched; the caller re-decides.
* The stats: claims taken, claims lost, and double claims (a switch-in that
* found its VM held by another core -- must stay 0). */
int sk_vm_try_claim(struct VM *vm);
void sk_vm_switch_claim_stats(uint64_t *claims, uint64_t *lost, uint64_t *doubles);
/* FABRIC-3.md §XXVIII Stage 3 follow-on (2026-09-14): which VM is
* currently physically running, tracked by the switch mechanism itself --
* see switch.c's own doc comment on g_switch_current_vm for why this