add support for modal vm runtime#1907

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add support for modal vm runtime #1907
shariqm-modal wants to merge 1 commit into
harbor-framework:main from
modal-projects:shariqm-modal/modal-vm-runtime

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@shariqm-modal shariqm-modal commented Jun 13, 2026 •

edited by devin-ai-integration Bot

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Modal recently alpha released VM Sandboxes, and Harbor users have asked for support. This PR adds an opt-in path for Modal environments via --environment-kwarg modal_vm_runtime=true.

Adds Modal VM runtime opt-in through environment kwargs (modal_vm_runtime).
Enforces VM runtime GPU incompatibility with a clear error.
Adjusts memory handling for VM runtime so request/limit semantics align with Modal VM behavior (e.g. LIMIT mode resolves to equal request and limit).
Keeps existing DinD behavior for non-VM mode (enable_docker=True), while using VM runtime options when modal_vm_runtime=true.

Try it out:
uv run harbor run -t hello-world/hello-world --env modal --ek modal_vm_runtime=true