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Nested virtualization on runners

KVM and Hyper-V exposed inside the runner for Android emulators, Firecracker microVMs and VM-based integration tests.

Specifications

Linux
KVM exposed to the job
Windows
Hyper-V available on 2025 images
Android emulator
Hardware accelerated

Runner labels

  • runnerhut-8vcpu-ubuntu-2404
  • runnerhut-16vcpu-windows-2025

Without KVM, an Android emulator falls back to software rendering and a test suite that takes 4 minutes locally takes 40 in CI. GitHub-hosted Linux runners do not expose KVM on the standard tiers.

yaml
jobs:
  android:
    runs-on: runnerhut-8vcpu-ubuntu-2404
    steps:
      - uses: actions/checkout@v4
      - run: ls -l /dev/kvm    # present
      - uses: reactivecircus/android-emulator-runner@v2
        with:
          api-level: 34
          script: ./gradlew connectedCheck

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