Open Source Summit + Embedded Linux Conference North America 2026

Additional Authors/Contributors: Jim Huang, Assistant Professor, National Cheng Kung University

VirtIO is the standard interface for device virtualization, enabling guest systems to access host resources and powering platforms such as QEMU and ACRN, which provide virtualized block, network, input, and graphics devices.

This talk takes an implementation-focused approach to virtio-gpu. We add virtio-gpu and virtio-input support to a minimalist RISC-V Linux emulator, building a graphics virtualization bridge from the guest framebuffer to host GPU acceleration. We examine the architectural decisions and trade-offs required to make the system function end to end.

Although VirtIO simplifies abstraction, virtio-gpu remains one of its most complex devices. Enabling 3D acceleration goes beyond the specification and requires coordination with Mesa 3D and virglrenderer, as well as compatibility with OpenGL and Vulkan. We highlight practical gaps between specification and implementation, including memory management, command submission, and synchronization.

Attendees will gain:
* A clear mental model of virtio-gpu architecture, including 2D and 3D paths
* Practical insights into integrating Mesa 3D and virglrenderer

Reference implementation: https://github.com/sysprog21/semu