Crate virtio_accel_openvino 

Intel OpenVINO host backend for NPU, GPU, and CPU execution.

The production path accepts device-neutral TOSA 1.0 FlatBuffers, validates and analyzes them with virtio-accel-tosa, and lowers supported static floating-point and exact INT8 graphs to in-memory OpenVINO IR inside this host-native crate. Models are compiled with the ACCURACY execution mode hint so plugins may not silently execute a declared-FP32 graph at reduced precision. Program buffers are page-aligned allocations wrapped directly by OpenVINO tensors created from host pointers; output execution is accepted only when the runtime uses the same allocation as its output tensor.

The native modules compile only when the build script detects an OpenVINO C runtime (libopenvino_c) via pkg-config or the VIRTIO_ACCEL_OPENVINO_LIB_DIR override; the VIRTIO_ACCEL_OPENVINO variable forces the probe on (1, failing loudly when the runtime is missing) or off (0). Builds without the runtime keep the portable lowering module and an unsupported-runtime placeholder.

Structs

OpenVinoAccelerator

Placeholder that keeps workspace consumers portable when no OpenVINO runtime was detected.

Enums

InitError

Failure to initialize an OpenVINO backend instance.

LoweringError

Constants

OPENVINO_TOSA_CAPABILITY

Conservative floating-profile capability boundary for OpenVINO lowering.

OPENVINO_TOSA_FP8_CAPABILITY

FP8 capability boundary (ADR 0009): (FP8, FP8) -> FP16 MATMUL and exact FP8 data movement.

OPENVINO_TOSA_FP8_TARGET

TOSA FP8 target (ADR 0009), mirroring VULKAN_TOSA_FP8_TARGET exactly.

OPENVINO_TOSA_INTEGER_CAPABILITY

Conservative exact integer-profile capability boundary for OpenVINO lowering.

OPENVINO_TOSA_INTEGER_TARGET

TOSA integer-profile target lowered with exact INT8 storage and INT32 arithmetic.

OPENVINO_TOSA_TARGET

TOSA target currently lowered by the OpenVINO backend.

REQUIRED_RESIDENT_BYTES

The OpenVINO runtime does not publish a finite upper bound for compiled-model residency.

Functions

supports_tosa_dtype

Whether this lowering can expose dtype at an OpenVINO model boundary.

supports_tosa_operator

Whether the initial OpenVINO lowering tier can lower op for supported types and attributes.