Add gaudi support to MCV - #172
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📝 WalkthroughSummary by CodeRabbit
WalkthroughThe change adds Intel Gaudi support through ChangesGaudi support and container execution
Estimated code review effort: 4 (Complex) | ~60 minutes Merge Risk: 🟡 Moderate · up to The updated setup instructions can disable AppArmor protection and can fail to provision writable build storage for hosts using a different UID, leading to security exposure or failed image builds. These bounded issues should be corrected or explicitly accepted before merging. Sequence Diagram(s)sequenceDiagram
participant MCV
participant hl-smi
participant HabanaCache
participant Preflight
MCV->>hl-smi: Query Gaudi hardware
hl-smi-->>MCV: Return CSV device data
MCV->>HabanaCache: Detect recipe files and build labels
HabanaCache-->>MCV: Return cache summary and cache type
MCV->>Preflight: Compare Habana cache summary with HPU backend
Preflight-->>MCV: Return compatibility result
Suggested reviewers: 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
Full details: Docstring CoverageExplanation Docstring coverage is 44.64% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 56 functions across 20 files. (3 skipped: 3 unsupported.) ✨ Finishing Touches🧪 Generate unit tests (beta)
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Inline comments:
In `@mcv/images/Containerfile`:
- Around line 186-188: Update the installer flow around
/tmp/habanalabs-installer.sh to verify the downloaded Habana installer against a
vendor-provided checksum or signature tied to HABANA_VERSION before making it
executable or invoking its install command; abort the build when verification
fails, while preserving the existing installation behavior after successful
validation.
- Around line 186-190: Update the HABANA installer command in the Containerfile
so its exit status is preserved: write installer output to a temporary file,
execute and validate the installer directly, then print the final five log lines
only after successful completion. Keep cleanup behavior intact and ensure
installer failure causes the image layer to fail.
In `@mcv/pkg/accelerator/devices/gaudi.go`:
- Around line 24-30: Replace the repeated "HL-325L" literal with a package-level
product constant, using it as the productToArch key in
mcv/pkg/accelerator/devices/gaudi.go (lines 24-30), in the direct parser
assertion in mcv/pkg/accelerator/devices/gaudi_test.go (lines 27-32), and in the
architecture mapping test table in mcv/pkg/accelerator/devices/gaudi_test.go
(lines 147-155).
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mcv/Makefilemcv/images/Containerfilemcv/pkg/accelerator/devices/device.gomcv/pkg/accelerator/devices/gaudi.gomcv/pkg/accelerator/devices/gaudi_test.go
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August 25, 2026 19:08
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Actionable comments posted: 5
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Inline comments:
In `@mcv/docs/no-gpu-usage.md`:
- Around line 47-53: Update the Podman command examples at
mcv/docs/no-gpu-usage.md lines 47-53, 107-113, and 180-187 to map registry
credentials to appuser before the authenticated buildah push. Apply
--userns=keep-id:uid=1000,gid=1000 consistently at all three sites, or mount
credential copies owned by mapped UID 1000, while preserving the existing
command behavior.
In `@mcv/images/Containerfile`:
- Around line 196-202: Update the Habana repository key setup in
mcv/images/Containerfile lines 196-202 and 345-351: download the signing key to
a temporary file, verify its expected fingerprint using an independent trusted
value, and only then create /usr/share/keyrings/habana-artifactory.gpg. Apply
the same verification flow at both sites before configuring or using the Habana
repository.
- Around line 71-93: Make Buildah’s configured runroot and graphroot writable by
arbitrary runtime UIDs in mcv/images/Containerfile ranges 71-93, 192-228,
263-288, and 359-384, rather than restricting ownership to appuser UID 1000;
preserve the existing storage paths and CreateImage/storage.GetStore behavior.
Update the corresponding Docker usage guidance in mcv/README.md:601-605 and
mcv/docs/unified-mcv-container.md:432-441 to match the runtime-UID behavior.
In `@mcv/pkg/accelerator/devices/static.go`:
- Around line 83-85: Update the stubbed device definition’s DeviceType in the
static device setup to use the GAUDI enum or constant instead of numeric value
1, while preserving stubbedGaudiName and the existing HwType metadata.
In `@mcv/pkg/cache/habana.go`:
- Around line 188-202: Update buildHabanaSummary to populate SummaryTargetInfo
with a reliable Gaudi-family identifier instead of only Backend: habanaBackend,
and make CompareCacheSummaryLabelToGPU compare that family when validating HPU
targets. Preserve deduplication by device ID, and add coverage for both Gaudi 2
and Gaudi 3 replay directions so incompatible caches are rejected while matching
caches are accepted.
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.github/workflows/mcv-build-example-images.yml.github/workflows/mcv-build.ymlmcv/README.mdmcv/docs/no-gpu-usage.mdmcv/docs/unified-mcv-container.mdmcv/images/Containerfilemcv/pkg/accelerator/devices/amd.gomcv/pkg/accelerator/devices/device.gomcv/pkg/accelerator/devices/gaudi.gomcv/pkg/accelerator/devices/gaudi_test.gomcv/pkg/accelerator/devices/static.gomcv/pkg/accelerator/devices/utils.gomcv/pkg/cache/cache.gomcv/pkg/cache/habana.gomcv/pkg/cache/habana_test.gomcv/pkg/cacheplan/cacheplan.gomcv/pkg/cacheplan/cacheplan_test.gomcv/pkg/constants/constants.gomcv/pkg/fetcher/imgfetcher.gomcv/pkg/preflightcheck/utils.go
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Inline comments:
In `@mcv/pkg/cacheplan/cacheplan.go`:
- Around line 215-216: Update deriveVLLM and the corresponding Habana derivation
path to accept only constants.VLLMCacheRoot and constants.HabanaRecipeCacheEnv
respectively when parsing LabelCacheRootEnv; reject any other value, including
empty input, and reject an empty mount directory before constructing CachePlan.
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mcv/pkg/accelerator/devices/stub.gomcv/pkg/cache/habana.gomcv/pkg/cacheplan/cacheplan.gomcv/pkg/cacheplan/cacheplan_test.go
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Inline comments:
In `@mcv/README.md`:
- Around line 54-57: Remove the flags=(unconfined) setting from the AppArmor
profile declaration for mcv, while preserving the existing userns rule and local
include.
- Around line 601-612: Replace the storage-directory provisioning command in
both mcv/README.md lines 601-612 and mcv/docs/unified-mcv-container.md lines
433-448 with elevated installation that creates /tmp/mcv-storage owned by
UID/GID 1000 and mode 700; use sudo install -d -o 1000 -g 1000 -m 700 so the
subsequent --user 1000:1000 container can write regardless of the host UID.
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Add Intel Gaudi (Habana) accelerator support to MCV, enabling creation, extraction, and preflight validation of Habana Synapse recipe cache images. Gaudi uses a recipe cache (PT_HPU_RECIPE_CACHE_CONFIG) to persist compiled graph recipes across process restarts, reducing vLLM warmup time by ~38% for BF16 workloads. This PR adds MCV support for capturing that cache as an OCI image and extracting it on target nodes, following the same create/extract/preflight pattern used for Triton and vLLM caches. Changes - pkg/constants/constants.go — Add Habana cache type, directory paths, env var, and manifest directory constants - pkg/cache/habana.go — Implement Habana cache backend: recipe file detection via regex, cache directory scanning, summary building with device fingerprint and Synapse version metadata - pkg/cache/habana_test.go — Unit tests for regex matching, detection, and summary building - pkg/cache/cache.go — Wire Habana into DetectCaches(), GetTagsFromCaches(), and ExtractCacheDirectory() - pkg/preflightcheck/utils.go — Add Habana cases to CompareCacheSummaryLabelToGPU(), DetectCacheTypeFromLabels(), and CompareCacheManifestToGPU() with HPU backend-only matching - pkg/fetcher/imgfetcher.go — Add Habana case to validateExtractedCacheSize() and default extract directory switch Test plan - Unit tests pass for recipe file regex, cache detection, and summary generation - End-to-end validated on 8x Gaudi 3 (HL-325L): MCV create → OCI push → MCV extract → vLLM startup with recipe cache replay confirmed working Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com> Signed-off-by: Billy McFall <22157057+Billy99@users.noreply.github.com>
Additional changes to MCV to support KServe. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> Signed-off-by: Billy McFall <22157057+Billy99@users.noreply.github.com>
There is logic in MCV to stub out GPUs for testing without a GPU (like in
a KIND Cluster). The stub implementation was spread across 3 files and only
supported AMD. Reworked the logic so that ROCm, Gaudi and Cuda can be
stubbed, and consolidated the stub logic to one new file. The stub is be
managed by an environment variable MCV_STUB_PROFILE, valid values are
"amd" (default), "gaudi", or "nvidia".
During the rework, it was observed that there were multiple definitions for
some of the backend strings ("hip", "hpu", etc) and other places that were
just using hardcoded strings. So backend constants were defined and used
everywhere.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Signed-off-by: Billy McFall <22157057+Billy99@users.noreply.github.com>
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maryamtahhan
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Sep 3, 2026
| func activeStubProfile() *stubProfile { | ||
| val := os.Getenv(EnvStubProfile) | ||
| switch val { | ||
| case "", "amd": |
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will "" make this code block always default to AMD if the env var is not set?
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I guess if that's the intention that's ok. but then we need to update the comment above 'Defaults to Gaudi when the variable is unset'
Collaborator
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Looks Good - just one open question |
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Add Intel Gaudi (Habana) accelerator support to MCV, enabling creation, extraction, and preflight validation of Habana Synapse recipe cache images.
Gaudi uses a recipe cache (PT_HPU_RECIPE_CACHE_CONFIG) to persist compiled graph recipes across process restarts, reducing vLLM warmup time by ~34% for BF16 workloads. This PR adds MCV support for capturing that cache as an OCI image and extracting it on target nodes, following the same create/extract/preflight pattern used for Triton and vLLM caches.
Changes
Test plan