Nowadays, many vendors that provide virtualization solutions also provide commercial desktop as a service (DaaS) to cloud users. However, these open source virtualization solutions have graphics performance limitation issues associated with 3D rendering. In this paper, we present an implementation of GPU virtualization using GPU pass-through technology to enable high graphics performance by KVM hypervisor based VMs. We focus on GPU virtualization, specifically, GPU direct pass-through, as a

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... s of providing 3D rendering for cloud DaaS service to game users. We use the KVM hypervisor as our background system virtualization technology.