From 393f1c676d0fc9c7b37ab6a52efe7e2d288d7e90 Mon Sep 17 00:00:00 2001 From: Arthur Hanson Rasmusson Date: Wed, 21 Oct 2026 14:02:15 -0400 Subject: gr: r420b author the guest QMD release on every outcome when release0 is redirected With gsp_phys_rmcall_gr_rel_mod=1 (release0 -> module semaphore, the ordering fix for the engine-release-before-copy-out race) the engine never writes the guest's own QMD release word, so the host must author it on EVERY backend outcome. The hold's success/fail edges do; a launch with no deferred release records (no hold engaged) fell through and its client hung on a word nothing would ever write - the r414 saxpy f0 cur=5 stall. The backend now reports qmd_rel_redirected in the copy result whenever it points release0 at the module semaphore (rel_mod, or no targetable guest release page). svc_fwd_gr_work folds that into the existing gr_rel_unobserved latch, which makes the bounded outcome check author the word on done (success or failure) - the same forward-only write the hold edges perform. rel_mod=0 paths are unchanged (the engine still authors the word and the latch is only set on an unresolved release page). --- kernel/gsp_phys_booter.h | 11 +++++++++++ 1 file changed, 11 insertions(+) (limited to 'kernel/gsp_phys_booter.h') diff --git a/kernel/gsp_phys_booter.h b/kernel/gsp_phys_booter.h index 42729d8..80beb54 100644 --- a/kernel/gsp_phys_booter.h +++ b/kernel/gsp_phys_booter.h @@ -275,6 +275,17 @@ struct gsp_phys_backend_copy_result { u32 elapsed_ms; /* return-to-caller elapsed milliseconds */ int rc; /* duplicated function return code */ struct gsp_phys_fault_info fault; /* decoded engine fault, if any */ + /* + * r420b: the forwarded launch's QMD release0 was redirected to the + * module semaphore (gsp_phys_rmcall_gr_rel_mod=1, or an unresolved + * guest release page), so the ENGINE will never write the guest's own + * QMD release word. The caller must author it in software on every + * outcome (the same write the hold's success edge performs); without + * this a rel_mod=1 launch with no deferred release records is never + * completed on the guest word and the client hangs (the r414 saxpy + * f0 cur=5 stall). + */ + bool qmd_rel_redirected; }; int gsp_phys_backend_guest_ce_copy_ex(u64 src_hpa, u32 src_off, u64 dst_hpa, -- cgit v1.2.3