Replace FlatBuffers with serde/postcard for host-guest messages by ludfjig · Pull Request #2044 · hyperlight-dev/hyperlight

ludfjig · 2026-11-10T20:14:40Z

Implements HIP 0008 (#1999).

Details not covered by the HIP:

FunctionCall, ParameterValue and ReturnValue map to private wire types, because their byte payloads travel separately. GuestLogData, GuestEvent and ReturnType derive serde and are encoded directly.
abi_tests.rs pins the encoded bytes of every message type. A failure explains that the change breaks snapshots and points to docs/snapshot-versioning.md.
Snapshot ABI 10 and goldens v10.0.
Floats keep their exact bits, including -0.0.
New fuzz target fuzz_control_decode. fuzz_guest_trace_decode replaces the trace size estimator target.
Removes estimate_flatbuffer_capacity and the FlatBuffers HyperlightError variants.

Follow-ups: borrow decoded strings, reuse encode buffers (maayybe, need to be careful about security) (#671), remove the chunked flag (#1987), and rename flatbuffer_wrappers.

Fixes #1607

andreiltd · 2026-11-12T15:33:12Z

Nice! I believe all the: TryFrom<ParameterValue> and TryFrom<ReturnValue> can be also removed?

ludfjig · 2026-11-12T19:50:39Z

Nice! I believe all the: TryFrom<ParameterValue> and TryFrom<ReturnValue> can be also removed?

Thanks nice catch. They should go, but i'd prefer do it in a follow up pr, it brings a lot of unrelated code changes if you don't mind and would be a breaking change (they're in public api call_host_function )

Copilot

🟡 Changes recommended

The security documentation overstates allocation guarantees because decoded parameters and trace fields lack per-collection count limits despite transport-size bounds.

1 open issue

Avoid claiming fixed limits for decoded collection allocations · New

What changed in this PR

This PR implements HIP 0008 by using serde/postcard for Hyperlight’s host-guest messages while keeping byte payloads separate from control data.

Changes:

Adds postcard wire types and explicit control-data lengths, and removes FlatBuffers schemas, generated code, and dependencies.
Updates snapshot compatibility to ABI 10 and goldens v10.0, with exact-bit float assertions.
Adds decoder fuzzing and updates communication, security, and development documentation.

File	Description
`src/tests/rust_guests/Cargo.lock`	Updates guest serialization dependencies.
`src/schema/host_function_details.fbs`	Removes the host-function collection schema.
`src/schema/host_function_definition.fbs`	Removes the host-function definition schema.
`src/schema/guest_trace_data.fbs`	Removes the trace schema.
`src/schema/guest_log_data.fbs`	Removes the log schema.
`src/schema/guest_error.fbs`	Removes the guest-error schema.
`src/schema/function_types.fbs`	Removes the value and type schemas.
`src/schema/function_call.fbs`	Removes the call schema.
`src/schema/function_call_result.fbs`	Removes the result schema.
`src/schema/all.fbs`	Removes the schema entry point.
`src/hyperlight_host/tests/snapshot_goldens/goldens_version.rs`	Selects goldens v10.0.
`src/hyperlight_host/tests/sandbox_host_tests.rs`	Checks exact float bits after round trips.
`src/hyperlight_host/src/sandbox/snapshot/tripwires.rs`	Pins ABI 10 and references wire-format tests.
`src/hyperlight_host/src/sandbox/snapshot/file/media_types.rs`	Sets snapshot ABI 10.
`src/hyperlight_host/src/sandbox/snapshot/file_tests.rs`	Updates snapshot ABI expectations.
`src/hyperlight_host/src/sandbox/outb.rs`	Passes headers into message decoders.
`src/hyperlight_host/src/mem/virtq/codec.rs`	Reads header-sized control data and uses vector encoding.
`src/hyperlight_host/src/mem/shared_mem.rs`	Updates decoder terminology in safety comments.
`src/hyperlight_host/src/mem/mgr.rs`	Integrates postcard encoding and header-based decoding.
`src/hyperlight_host/src/error.rs`	Removes FlatBuffers-specific error variants.
`src/hyperlight_host/Cargo.toml`	Removes the FlatBuffers dependency.
`src/hyperlight_host/benches/benchmarks.rs`	Adapts codec benchmarks to vector buffers.
`src/hyperlight_guest/src/transport/context.rs`	Integrates the guest-side encoding and framing changes.
`src/hyperlight_guest/Cargo.toml`	Removes the FlatBuffers dependency.
`src/hyperlight_guest_capi/Cargo.toml`	Removes the FlatBuffers dependency.
`src/hyperlight_guest_bin/Cargo.toml`	Removes the FlatBuffers dependency.
`src/hyperlight_common/src/transport.rs`	Adds control length to the 16-byte header.
`src/hyperlight_common/src/lib.rs`	Removes the generated FlatBuffers module declaration.
`src/hyperlight_common/src/flatbuffers/mod.rs`	Removes generated module exports.
`src/hyperlight_common/src/flatbuffers/hyperlight/generated/return_value_generated.rs`	Removes generated return-value bindings.
`src/hyperlight_common/src/flatbuffers/hyperlight/generated/return_type_generated.rs`	Removes generated return-type bindings.
`src/hyperlight_common/src/flatbuffers/hyperlight/generated/parameter_value_generated.rs`	Removes generated parameter-value bindings.
`src/hyperlight_common/src/flatbuffers/hyperlight/generated/parameter_type_generated.rs`	Removes generated parameter-type bindings.
`src/hyperlight_common/src/flatbuffers/hyperlight/generated/open_span_type_generated.rs`	Removes generated span-opening bindings.
`src/hyperlight_common/src/flatbuffers/hyperlight/generated/log_level_generated.rs`	Removes generated log-level bindings.
`src/hyperlight_common/src/flatbuffers/hyperlight/generated/log_event_type_generated.rs`	Removes generated log-event bindings.
`src/hyperlight_common/src/flatbuffers/hyperlight/generated/key_value_generated.rs`	Removes generated trace-field bindings.
`src/hyperlight_common/src/flatbuffers/hyperlight/generated/host_function_details_generated.rs`	Removes generated host-function collection bindings.
`src/hyperlight_common/src/flatbuffers/hyperlight/generated/host_function_definition_generated.rs`	Removes generated host-function definition bindings.
`src/hyperlight_common/src/flatbuffers/hyperlight/generated/hlvoid_generated.rs`	Removes generated void bindings.
`src/hyperlight_common/src/flatbuffers/hyperlight/generated/hlulong_generated.rs`	Removes generated unsigned 64-bit bindings.
`src/hyperlight_common/src/flatbuffers/hyperlight/generated/hluint_generated.rs`	Removes generated unsigned 32-bit bindings.
`src/hyperlight_common/src/flatbuffers/hyperlight/generated/hlstring_generated.rs`	Removes generated string bindings.
`src/hyperlight_common/src/flatbuffers/hyperlight/generated/hllong_generated.rs`	Removes generated signed 64-bit bindings.
`src/hyperlight_common/src/flatbuffers/hyperlight/generated/hlint_generated.rs`	Removes generated signed 32-bit bindings.
`src/hyperlight_common/src/flatbuffers/hyperlight/generated/hlfloat_generated.rs`	Removes generated float bindings.
`src/hyperlight_common/src/flatbuffers/hyperlight/generated/hlexternalbytes_generated.rs`	Removes generated external-byte bindings.
`src/hyperlight_common/src/flatbuffers/hyperlight/generated/hldouble_generated.rs`	Removes generated double bindings.
`src/hyperlight_common/src/flatbuffers/hyperlight/generated/hlbool_generated.rs`	Removes generated boolean bindings.
`src/hyperlight_common/src/flatbuffers/hyperlight/generated/guest_start_type_generated.rs`	Removes generated guest-start bindings.
`src/hyperlight_common/src/flatbuffers/hyperlight/generated/guest_log_data_generated.rs`	Removes generated guest-log bindings.
`src/hyperlight_common/src/flatbuffers/hyperlight/generated/guest_event_union_type_generated.rs`	Removes generated event-union bindings.
`src/hyperlight_common/src/flatbuffers/hyperlight/generated/guest_event_type_generated.rs`	Removes generated event-type bindings.
`src/hyperlight_common/src/flatbuffers/hyperlight/generated/guest_event_generated.rs`	Removes generated guest-event bindings.
`src/hyperlight_common/src/flatbuffers/hyperlight/generated/guest_error_generated.rs`	Removes generated guest-error bindings.
`src/hyperlight_common/src/flatbuffers/hyperlight/generated/function_call_type_generated.rs`	Removes generated call-type bindings.
`src/hyperlight_common/src/flatbuffers/hyperlight/generated/function_call_result_type_generated.rs`	Removes generated result-type bindings.
`src/hyperlight_common/src/flatbuffers/hyperlight/generated/function_call_result_generated.rs`	Removes generated call-result bindings.
`src/hyperlight_common/src/flatbuffers/hyperlight/generated/function_call_generated.rs`	Removes generated function-call bindings.
`src/hyperlight_common/src/flatbuffers/hyperlight/generated/error_code_generated.rs`	Removes generated error-code bindings.
`src/hyperlight_common/src/flatbuffers/hyperlight/generated/edit_span_type_generated.rs`	Removes generated span-editing bindings.
`src/hyperlight_common/src/flatbuffers/hyperlight/generated/close_span_type_generated.rs`	Removes generated span-closing bindings.
`src/hyperlight_common/src/flatbuffer_wrappers/wire.rs`	Defines postcard wire types and encoding helpers.
`src/hyperlight_common/src/flatbuffer_wrappers/mod.rs`	Registers wire encoding and ABI tests.
`src/hyperlight_common/src/flatbuffer_wrappers/host_function_details.rs`	Removes FlatBuffers serialization conversions.
`src/hyperlight_common/src/flatbuffer_wrappers/host_function_definition.rs`	Removes FlatBuffers definition conversions.
`src/hyperlight_common/src/flatbuffer_wrappers/guest_log_level.rs`	Adds serde support for log levels.
`src/hyperlight_common/src/flatbuffer_wrappers/guest_log_data.rs`	Uses postcard for logs and adds a round-trip test.
`src/hyperlight_common/src/flatbuffer_wrappers/guest_error.rs`	Removes generated error-code conversions.
`src/hyperlight_common/src/flatbuffer_wrappers/codec.rs`	Updates external-value documentation terminology.
`src/hyperlight_common/Cargo.toml`	Replaces FlatBuffers with serde and postcard.
`README.md`	Removes the schema-directory listing.
`Justfile`	Updates fuzz targets and removes FlatBuffers tooling recipes.
`fuzz/README.md`	Documents control-decoder fuzzing.
`fuzz/fuzz_targets/guest_trace_decode.rs`	Fuzzes trace decoding and event round trips.
`fuzz/fuzz_targets/control_decode.rs`	Fuzzes call, result, and log decoding.
`fuzz/Cargo.toml`	Registers the decoder fuzz targets.
`flake.nix`	Removes FlatBuffers development tooling.
`docs/virtio-host-guest-communication.md`	Documents postcard framing and external bytes.
`docs/snapshot-versioning.md`	Documents ABI 10 and wire-format enforcement.
`docs/security.md`	Describes serde/postcard decoding at the trust boundary.
`docs/security-guidance-for-developers.md`	Updates compatibility and message-validation guidance.
`docs/README.md`	Removes the FlatBuffers guide link.
`docs/how-to-use-flatbuffers.md`	Removes the obsolete generation guide.
`CHANGELOG.md`	Records the breaking serialization change.
`Cargo.lock`	Updates workspace serialization dependencies.
`.github/workflows/ValidatePullRequest.yml`	Runs decoder fuzz targets during PR validation.
`.github/workflows/Fuzzing.yml`	Updates the fuzzing target matrix.
`.github/workflows/DailyArm64.yml`	Updates the trace-fuzzer name in a comment.
`.github/copilot-instructions.md`	Removes the obsolete schema-directory listing.

_{Review effort: Balanced}

ludfjig · 2026-11-12T19:54:49Z

 ### Host-Guest Communication (Serialization and Deserialization)

-All communication between the host and the guest is done through a shared memory buffer. Messages are serialized and deserialized using [FlatBuffers](https://flatbuffers.dev/). To minimize attack surface area, we rely on FlatBuffers to formally specify the data structures passed to/from the host and guest, and to generate serialization/deserialization code. Of course, a compromised guest can write arbitrary data to the shared memory buffer, but the host will not accept anything that does not match our strongly typed FlatBuffer [schemas](../src/schema).
+All communication between the host and the guest is done through a shared memory buffer. Messages are serialized with [serde](https://serde.rs) into the [postcard](https://docs.rs/postcard) format, using strongly typed Rust definitions in `hyperlight-common`. The host copies guest data out of shared memory before decoding it. Decoding rejects malformed input and trailing bytes, and checks every length against fixed limits before allocating. A compromised guest can write arbitrary data to the shared memory buffer, but the host accepts only messages that decode into these types.


Fixed. Lengths are bounded by the received message, not fixed limits.

Signed-off-by: Ludvig Liljenberg <4257730+ludfjig@users.noreply.github.com>

hyperlight-gh-bot · 2026-11-12T21:11:52Z

Benchmark Results

Measured commit: 91219d277cf2
Baseline commit: 01df99173865

kvm / amd (Linux) (🌟 5.19x)

Top improvements

function_call_codec/encode_control/vec_bytes — 🌟 5.19x faster
function_call_codec/encode_control/byte_chunks — 🌟 2.47x faster

Benchmark Results

function_call_codec

	`encode_control`	`decode_vec_bytes_copy`
`byte_chunks`	`307.73 ns` (🌟 2.47x faster)
`vec_bytes`	`114.64 ns` (🌟 5.19x faster)
		`372.24 µs` (➖ 1.00x faster)

payload_allocation

	`slot_pool_segmented`
`262144`	`524.82 ns` (➖ 1.05x faster)
`65536`	`141.32 ns` (➖ 1.03x faster)

sandboxes

	`create_initialized_and_drop`
`medium`	`13.00 ms` (➖ 1.01x faster)

slot_pool

	`alloc_dealloc_128`	`alloc_dealloc_4096`	`alloc_dealloc_1500`
	`7.76 ns` (➖ 1.01x slower)	`7.68 ns` (➖ 1.00x faster)	`7.69 ns` (➖ 1.00x slower)

snapshot_files

	`load_snapshot_unverified`
`small`	`99.39 µs` (➖ 1.01x slower)

virtq_readonly

	`slot_pool_segmented`	`slot_pool_segmented_fragmented`
`262144`	`7.44 µs` (➖ 1.01x slower)	`7.29 µs` (➖ 1.01x faster)
`65536`	`2.00 µs` (➖ 1.04x faster)	`2.08 µs` (➖ 1.09x slower)

virtq_readwrite

	`slot_pool_segmented`	`slot_pool_segmented_fragmented`
`262144`	`28.14 µs` (➖ 1.03x slower)
`65536`	`6.70 µs` (➖ 1.04x slower)	`6.25 µs` (➖ 1.04x faster)
`8192`	`1.02 µs` (➖ 1.01x slower)	`1.03 µs` (➖ 1.00x slower)

kvm / intel (Linux) (🌟 4.22x)

Top improvements

function_call_codec/encode_control/vec_bytes — 🌟 4.22x faster
function_call_codec/encode_control/byte_chunks — 🌟 2.73x faster

Benchmark Results

function_call_codec

	`encode_control`	`decode_vec_bytes_copy`
`byte_chunks`	`310.79 ns` (🌟 2.73x faster)
`vec_bytes`	`121.71 ns` (🌟 4.22x faster)
		`654.46 µs` (➖ 1.00x slower)

payload_allocation

	`slot_pool_segmented`
`262144`	`497.44 ns` (➖ 1.00x slower)
`65536`	`169.43 ns` (➖ 1.01x faster)

sandboxes

	`create_initialized_and_drop`
`medium`	`15.31 ms` (➖ 1.03x faster)

slot_pool

	`alloc_dealloc_128`	`alloc_dealloc_4096`	`alloc_dealloc_1500`
	`7.00 ns` (➖ 1.03x slower)	`6.91 ns` (➖ 1.02x slower)	`7.01 ns` (➖ 1.04x slower)

snapshot_files

	`load_snapshot_unverified`
`small`	`48.88 µs` (➖ 1.03x slower)

virtq_readonly

	`slot_pool_segmented`	`slot_pool_segmented_fragmented`
`262144`	`7.55 µs` (➖ 1.00x slower)	`7.50 µs` (➖ 1.01x slower)
`65536`	`2.12 µs` (➖ 1.01x slower)	`2.11 µs` (➖ 1.00x slower)

virtq_readwrite

	`slot_pool_segmented`	`slot_pool_segmented_fragmented`
`262144`	`29.31 µs` (➖ 1.02x faster)
`65536`	`7.09 µs` (➖ 1.01x faster)	`6.98 µs` (➖ 1.06x faster)
`8192`	`700.07 ns` (➖ 1.00x faster)	`710.16 ns` (➖ 1.05x faster)

mshv3 / amd (Linux) (🌟 4.91x)

Top improvements

function_call_codec/encode_control/vec_bytes — 🌟 4.91x faster
function_call_codec/encode_control/byte_chunks — 🌟 2.28x faster
virtq_readonly/slot_pool_segmented/262144 — ✅ 1.71x faster

Benchmark Results

function_call_codec

	`encode_control`	`decode_vec_bytes_copy`
`byte_chunks`	`403.31 ns` (🌟 2.28x faster)
`vec_bytes`	`145.88 ns` (🌟 4.91x faster)
		`360.54 µs` (➖ 1.01x slower)

payload_allocation

	`slot_pool_segmented`
`262144`	`792.18 ns` (➖ 1.08x slower)
`65536`	`193.83 ns` (➖ 1.00x slower)

sandboxes

	`create_initialized_and_drop`
`medium`	`53.82 ms` (➖ 1.28x faster)

slot_pool

	`alloc_dealloc_128`	`alloc_dealloc_4096`	`alloc_dealloc_1500`
	`13.02 ns` (➖ 1.35x slower)	`9.50 ns` (➖ 1.01x faster)	`10.07 ns` (➖ 1.05x slower)

snapshot_files

	`load_snapshot_unverified`
`small`	`104.71 µs` (➖ 1.08x faster)

virtq_readonly

	`slot_pool_segmented`	`slot_pool_segmented_fragmented`
`262144`	`9.90 µs` (✅ 1.71x faster)	`10.73 µs` (➖ 1.02x faster)
`65536`	`2.27 µs` (➖ 1.03x slower)	`2.41 µs` (➖ 1.01x faster)

virtq_readwrite

	`slot_pool_segmented`	`slot_pool_segmented_fragmented`
`262144`	`36.54 µs` (➖ 1.07x faster)
`65536`	`8.52 µs` (➖ 1.16x faster)	`8.52 µs` (➖ 1.16x faster)
`8192`	`1.20 µs` (➖ 1.02x faster)	`1.21 µs` (➖ 1.06x faster)

mshv3 / intel (Linux) (🌟 4.93x)

Top improvements

function_call_codec/encode_control/vec_bytes — 🌟 4.93x faster
function_call_codec/encode_control/byte_chunks — 🌟 2.42x faster

Benchmark Results

function_call_codec

	`encode_control`	`decode_vec_bytes_copy`
`byte_chunks`	`395.87 ns` (🌟 2.42x faster)
`vec_bytes`	`134.06 ns` (🌟 4.93x faster)
		`780.13 µs` (➖ 1.22x slower)

payload_allocation

	`slot_pool_segmented`
`262144`	`680.26 ns` (➖ 1.03x slower)
`65536`	`244.91 ns` (➖ 1.01x slower)

sandboxes

	`create_initialized_and_drop`
`medium`	`78.36 ms` (➖ 1.07x slower)

slot_pool

	`alloc_dealloc_128`	`alloc_dealloc_4096`	`alloc_dealloc_1500`
	`8.85 ns` (➖ 1.01x slower)	`8.71 ns` (➖ 1.00x faster)	`8.70 ns` (➖ 1.00x faster)

snapshot_files

	`load_snapshot_unverified`
`small`	`55.56 µs` (➖ 1.00x faster)

virtq_readonly

	`slot_pool_segmented`	`slot_pool_segmented_fragmented`
`262144`	`8.12 µs` (➖ 1.03x slower)	`8.09 µs` (➖ 1.02x slower)
`65536`	`2.30 µs` (➖ 1.01x slower)	`2.28 µs` (➖ 1.01x slower)

virtq_readwrite

	`slot_pool_segmented`	`slot_pool_segmented_fragmented`
`262144`	`40.66 µs` (➖ 1.09x slower)
`65536`	`7.56 µs` (➖ 1.01x faster)	`7.65 µs` (➖ 1.01x slower)
`8192`	`896.64 ns` (➖ 1.02x faster)	`897.31 ns` (➖ 1.01x faster)

hyperv-ws2025 / amd (Windows) (🌟 2.40x)

Top improvements

function_call_codec/encode_control/vec_bytes — 🌟 2.40x faster
function_call_codec/encode_control/byte_chunks — ✅ 1.68x faster

Benchmark Results

function_call_codec

	`encode_control`	`decode_vec_bytes_copy`
`byte_chunks`	`701.60 ns` (✅ 1.68x faster)
`vec_bytes`	`318.73 ns` (🌟 2.40x faster)
		`1.99 ms` (➖ 1.01x slower)

payload_allocation

	`slot_pool_segmented`
`262144`	`792.80 ns` (➖ 1.07x faster)
`65536`	`237.27 ns` (➖ 1.15x faster)

sandboxes

	`create_initialized_and_drop`
`medium`	`11.78 ms` (➖ 1.04x faster)

slot_pool

	`alloc_dealloc_128`	`alloc_dealloc_4096`	`alloc_dealloc_1500`
	`10.07 ns` (➖ 1.01x slower)	`9.99 ns` (➖ 1.00x faster)	`9.92 ns` (➖ 1.00x slower)

snapshot_files

	`load_snapshot_unverified`
`small`	`754.44 µs` (➖ 1.05x faster)

virtq_readonly

	`slot_pool_segmented`	`slot_pool_segmented_fragmented`
`262144`	`9.34 µs` (➖ 1.05x faster)	`9.01 µs` (➖ 1.06x faster)
`65536`	`2.43 µs` (➖ 1.21x faster)	`2.48 µs` (➖ 1.04x slower)

virtq_readwrite

	`slot_pool_segmented`	`slot_pool_segmented_fragmented`
`262144`	`39.89 µs` (➖ 1.04x slower)
`65536`	`8.72 µs` (➖ 1.00x slower)	`9.10 µs` (➖ 1.01x slower)
`8192`	`1.31 µs` (➖ 1.02x faster)	`1.29 µs` (➖ 1.02x faster)

hyperv-ws2025 / intel (Windows) (🌟 2.20x)

Top improvements

function_call_codec/encode_control/vec_bytes — 🌟 2.20x faster
function_call_codec/encode_control/byte_chunks — ✅ 1.67x faster

Benchmark Results

function_call_codec

	`encode_control`	`decode_vec_bytes_copy`
`byte_chunks`	`749.25 ns` (✅ 1.67x faster)
`vec_bytes`	`360.14 ns` (🌟 2.20x faster)
		`3.11 ms` (➖ 1.03x slower)

payload_allocation

	`slot_pool_segmented`
`262144`	`746.63 ns` (➖ 1.03x faster)
`65536`	`208.53 ns` (➖ 1.00x faster)

sandboxes

	`create_initialized_and_drop`
`medium`	`13.86 ms` (➖ 1.02x slower)

slot_pool

	`alloc_dealloc_128`	`alloc_dealloc_4096`	`alloc_dealloc_1500`
	`9.73 ns` (➖ 1.00x faster)	`10.42 ns` (➖ 1.02x slower)	`9.65 ns` (➖ 1.00x slower)

snapshot_files

	`load_snapshot_unverified`
`small`	`684.34 µs` (➖ 1.02x slower)

virtq_readonly

	`slot_pool_segmented`	`slot_pool_segmented_fragmented`
`262144`	`7.71 µs` (➖ 1.01x slower)	`7.75 µs` (➖ 1.01x slower)
`65536`	`2.39 µs` (➖ 1.04x slower)	`2.34 µs` (➖ 1.01x slower)

virtq_readwrite

	`slot_pool_segmented`	`slot_pool_segmented_fragmented`
`262144`	`49.61 µs` (➖ 1.01x slower)
`65536`	`8.55 µs` (➖ 1.01x slower)	`8.30 µs` (➖ 1.01x faster)
`8192`	`1.07 µs` (➖ 1.10x faster)	`1.07 µs` (➖ 1.01x faster)

_{Reported by cargo ci bench-report --candidate run:43294982031 --config-file bench_report.toml.}

ludfjig added C-refactor For PRs that restructure or remove code without adding new functionality. S-needs-goldens Regenerate snapshot golden fixtures labels Nov 10, 2026

This comment has been minimized.

Sign in to view

ludfjig force-pushed the ll/postcard-only branch from c27b99f to c056ede Compare November 10, 2026 21:38

This comment has been minimized.

Sign in to view

ludfjig force-pushed the ll/postcard-only branch from c056ede to e474c07 Compare November 10, 2026 22:43

This comment has been minimized.

Sign in to view

ludfjig marked this pull request as ready for review November 12, 2026 19:45

ludfjig requested review from andreiltd, danbugs, dblnz, devigned, jprendes, jsturtevant, simongdavies, squillace and syntactically as code owners November 12, 2026 19:45

Copilot AI balanced review requested due to automatic review settings November 12, 2026 19:45

Copilot started reviewing on behalf of ludfjig November 12, 2026 19:45

View session

Copilot AI reviewed Nov 12, 2026

View reviewed changes

Replace FlatBuffers with serde/postcard for host-guest messages

91219d2

Signed-off-by: Ludvig Liljenberg <4257730+ludfjig@users.noreply.github.com>

ludfjig force-pushed the ll/postcard-only branch from e474c07 to 91219d2 Compare November 12, 2026 19:54

Conversation

ludfjig commented Nov 10, 2026 • edited Loading Uh oh! There was an error while loading. Please reload this page.

Uh oh!

Uh oh!

This comment has been minimized.

This comment has been minimized.

This comment has been minimized.

andreiltd commented Nov 12, 2026

Uh oh!

ludfjig commented Nov 12, 2026 • edited Loading Uh oh! There was an error while loading. Please reload this page.

Uh oh!

Uh oh!

Copilot AI left a comment

Choose a reason for hiding this comment

🟡 Changes recommended

Uh oh!

ludfjig Nov 12, 2026

Choose a reason for hiding this comment

Uh oh!

hyperlight-gh-bot Bot commented Nov 12, 2026

Benchmark Results

Top improvements

Benchmark Results

function_call_codec

payload_allocation

sandboxes

slot_pool

snapshot_files

virtq_readonly

virtq_readwrite

Top improvements

Benchmark Results

function_call_codec

payload_allocation

sandboxes

slot_pool

snapshot_files

virtq_readonly

virtq_readwrite

Top improvements

Benchmark Results

function_call_codec

payload_allocation

sandboxes

slot_pool

snapshot_files

virtq_readonly

virtq_readwrite

Top improvements

Benchmark Results

function_call_codec

payload_allocation

sandboxes

slot_pool

snapshot_files

virtq_readonly

virtq_readwrite

Top improvements

Benchmark Results

function_call_codec

payload_allocation

sandboxes

slot_pool

snapshot_files

virtq_readonly

virtq_readwrite

Top improvements

Benchmark Results

function_call_codec

payload_allocation

sandboxes

slot_pool

snapshot_files

virtq_readonly

virtq_readwrite

Uh oh!

This branch has not been deployed

Reviewers

Uh oh!

Assignees

ludfjig commented Nov 10, 2026 •

edited

Loading

ludfjig commented Nov 12, 2026 •

edited

Loading