Add architecture-independent exception handling APIs sufficient for hyperlight-wasm #1690

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1. syntactically

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   Enhancement

   issue type on Jul 28, 2026
2. syntactically

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   lifecycle/confirmedBug is verified or proposal seems reasonableBug is verified or proposal seems reasonable

   area/APIRelated to the API or public interfaceRelated to the API or public interface

   on Jul 28, 2026
3. syntactically commented on Aug 26, 2026

   

   syntactically

   on Aug 26, 2026

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   These should likely be split up a little bit:

   • For virtual memory:
     • For CoW images, hl-wasm already uses vmem::MappingKind::Cow and does not need any extra help
     • We should add vmem::MappingKind::LazyZeroInitialised (or something of the sort), which would also be useful for the heap, potentially replacing the existing stack growth, etc, which populates invalid PTEs with flags on them that let the normal fault handler know to replace them with zero initialised pages
     • We also need some way to trap on violations of the permissions on pages, which are currently not being used. That should likely actually be handled like the next category, instead of like other virtual memory regions
   • For other exceptions:
     • Currently (already) the hl-wasm support is a little lacking: it only handles #UD on x86-64 which is used because that is the explicit trap instruction that wasmtime uses. We should instead have e.g. hyperlight_guest::exception::handle_undefined_instr, hyperlight_guest::exception::handle_permission_fault, etc., and the rewriting of registers to actually move into that handler (which should for the moment abort or longjmp) should move into the exception handler in hyperlight_guest.
4. jsturtevant

   added this to the v0.18.0 milestone on Sep 3, 2026
5. antsok

   marked this as blocking on Sep 14, 2026

   • Hyperlight: adopt native Windows ARM64 after upstream runtime and packaging support sokolaidev/maf-extensions#1254
6. yoshuawuyts

   added this to Hyperlight Roadmapon Oct 5, 2026
7. yoshuawuyts

   modified the milestones: v0.18.0, v0.19.0 on Oct 8, 2026