远程桌面协议 SPICE 介绍.pdf

Spice for Newbies Draft 2 Copyright © 2009 Red Hat, Inc. Licensed under a Creative Commons Attribution-Share Alike 3.0 United States License (see /licenses/by-sa/3.0/us/legalcode). Table of Contents 1 Introduction3 2 Basic Architecture3 2.1 Graphic Commands Flow3 2.2 Agent Commands Flow4 2.3 Spice Client5 2.3.1 Client Basic Structure5 2.3.2 Client Classes5 Channels5 Screens and Windows6 2.4 Spice Server6 2.4.1 Server Structure7 Red Server (reds.c)7 Graphics subsystem8 2.5 Spice Protocol9 2.6 QXL Device9 2.7 QXL Guest Drivers9 2.8 Spice Agent10 2.9 VDIPort Device and Driver10 3 Features10 3.1 Graphic Commands10 3.2 Hardware Acceleration10 3.3 Image Compression10 3.4 Video Compression11 3.5 Caching11 3.6 Mouse Modes11 3.7 Multiple Monitors12 3.8 2-way Audio and Lip-sync12 3.9 Hardware Cursor12 3.10 Live Migration12 4 References12 1 Introduction Spice is an open remote computing solution, providing client access to remote machine display and devices (e.g., keyboard, mouse, audio). Spice achieves a user experience similar to an interaction with a local machine, while trying to offload most of the intensive CPU and GPU tasks to the client. Spice is suitable for both LAN and WAN usage, without compromising on the user experience. 2 Basic Architecture Spice basic building blocks are the Spice protocol, Spice server and Spice client. Spice-related components include the QXL device and guest QXL driver. 2.1 Graphic Commands Flow Guest OS QEMU Client OS User Application