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6 phases, 28 tasks, ~3,600 lines, 10-16 weeks 40% code reuse from Intel driver (GEM, syncobj, fence, KMS, scheme) Linux 7.1 reference: 16 files, 5,837 lines Architecture map: guest Mesa → redox-drm → virtio queue → QEMU → host GPU Reuse assessment: 35 shared files (~8,200 lines) — all protocol-agnostic VIRGL-specific: virtio command submission, capset negotiation, GL contexts