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GiantVM共享内存版向Linux内核社区提交RFC

  • 2026-06-30 15:55:46
GiantVM共享内存版向Linux内核社区提交RFC

GiantVM:“多虚一”打破单机资源边界

传统而言,一台虚拟机的计算和内存资源主要受限于单台物理服务器的容量。“多虚一”技术 [1,3] 力图打破物理边界,在将多台服务器的计算资源合众为一的同时,保留应用层的单机模型抽象。其根植于分布式共享内存(Distributed Shared Memory, DSM)的思想,最早可追溯到美国国家工程院院士Kai Li教授在1986年的开创性研究工作 [2]。

随着现代AI、大数据、高性能计算(HPC)等工作负载日益繁重,我们观察到,系统设计中的难题周而复始,在新硬件条件、新负载条件下以新的形式出现。一方面,目前单纯提升单机配置进行纵向扩容(Scale-Up),面临日益严重的边际收益递减问题,尤其是受限于“内存墙”瓶颈;另一方面,目前采用集群化方案开展横向扩容(Scale-Out),则往往需要对上层应用程序进行深度改造,并引入可观的分布式通信开销。

什么是 GiantVM?

GiantVM项目由上海交通大学计算机学院可扩展计算研究所团队开发,构建了一种将多台物理主机聚合成一台虚拟机的“多虚一” Type II虚拟化框架。在基于标准Linux QEMU/KVM软件栈,保证客户机操作系统无需修改的同时,在CoreMark基准测试场景达到了接近普通虚拟机的99%的性能表现。结合新型互联总线技术,GiantVM能够支撑上层应用程序获得无感透明的性能提升。

技术优势

1

单机编程模型

GiantVM 提供共享内存抽象和单机编程模型,无需修改应用程序,即可运行在多台物理机上。

2

更高的资源利用率与可扩展内存容量

聚合多台物理主机的资源,按需分配给单台虚拟机,突破单机内存与CPU核心数上限。

3

透明的数据共享与迁移

数据在物理节点之间自动、透明地分布和移动,应用程序无感知,提供进程级跨机迁移。

4

与现代高速互连技术的集成

基于RDMA及多款内存语义互连总线(如CXL和华为灵衢UnifiedBus等)的技术方案正在积极适配中,为未来性能优化铺平道路。

核心技术选型:

共享内存及APIC转发机制

本次开源的patch系列为GiantVM的共享内存启动路径提供了基础的KVM APIC转发支持,修改主要集中在KVM,对内核其他部分修改很少。

它实现了一个简洁的中断转发接口,允许 KVM 将选定的LAPIC中断状态交给用户态的GiantVM运行时,由后者将中断路由并重新注入到目标vCPU。这使得跨节点的 APIC/IPI 协同在启动和运行期间成为可能。

具体增加的功能包括:

新增 CONFIG_KVM_DSM_IRQ_FORWARD 内核编译选项。

拦截 LAPIC 对 APIC_ICR / APIC_ICR2 的 MMIO 写操作。

在需要时将中断处理出口到用户态(KVM_EXIT_DSM_SEND_IRQ)。

提供 VM ioctl 接口,允许 GiantVM 运行时将 DSM IPI、x2APIC ICR 等状态回注到 KVM

上述相关代码接口设计将根据社区反馈意见进行调整。

性能表现:

最高达普通虚拟机的99%,

集成新型总线获得9.9x提升

我们在4核到128核配置下运行CoreMark基准测试,目前GiantVM的开源方案,整体表现令人印象深刻:

vCPU数

GiantVM

得分

普通VM

得分

GiantVM / 

普通VM

4

98,783

101,032

97.77%

8

205,642

210,817

97.55%

16

390,974

400,500

97.62%

32

744,099

800,328

92.97%

64

1,477,804

1,629,535

90.69%

72

1,511,546

1,810,068

83.51%

128

2,531,447

2,556,548

99.02%

可以看到,在128核配置下,GiantVM 达到普通虚拟机性能的 99%,相对自身4核成绩扩展了 25.63倍,而普通虚拟机相应为25.30倍

在新型CXL总线的硬件支撑下,GiantVM在Spark Word Count和Inverted Index场景下最高可获得9.9x以上的性能提升。

图中,GVM是简单将RDMA替换为新型总线,基于“多虚一”运行原生Spark。xSpark为使用新型总线,基于原生操作系统的定制化Spark方案。XcaleVM为在GVM基础上进行针对总线特性的深度优化结果,基于“多虚一”运行原生Spark。基线(1x)为基于RDMA和原生操作系统的原生Spark方案。

可供体验

目前投递RFC为基于共享内存的GiantVM版本。欢迎体验我们的示例镜像!请移步项目主页,根据GVM-Kernel仓库中的README指引进行安装和下载。我们也为开源开发者提供源代码和内核编译指引文档。

TCP模式的GiantVM尝鲜版本已在开源仓库中提供(GVM-Kernel, GVM-qemu),镜像可在交大网盘下载,提取码qemu。欢迎反馈!

RDMA(已经完成)及CXL(和中国电信云计算研究院合作)和华为UB的方案敬请期待。

ARM适配正在进行中,RISC-V也即将适配。

demo视频请阅:

相关工作

相关文献

[1] Jin Zhang, Zhuocheng Ding, Yubin Chen, Xingguo Jia, Boshi Yu, Zhengwei Qi, Haibing Guan: "GiantVM: a type-II hypervisor implementing many-to-one virtualization." VEE 2020: 30-44.

[2] Kai Li: "Shared virtual memory on loosely coupled multiprocessors."  PhD Dissertation, Yale University, 1986.

[3] Xingguo Jia, Jin Zhang, Boshi Yu, Xingyue Qian, Zhengwei Qi, Haibing Guan: "GiantVM: A Novel Distributed Hypervisor for Resource Aggregation with  DSM-aware Optimizations." ACM Trans. Archit. Code Optim. 19(2):    20:1-20:27 (2022).

会议材料

- KVM Forum 2025: "GiantVM: A Many-to-one Virtualization System Built Atop the QEMU/KVM Hypervisor"

Link: https://pretalx.com/kvm-forum-2025/talk/MDGYZG/

- KVM Forum 2018: "Distributed QEMU" by Yubin Chen & Zhuocheng Ding  (Video) 

Link: https://www.youtube.com/watch?v=GprmhYU1M8Q

开源社区

项目主页:https://giantvm.github.io/

GitHub组织:https://github.com/GiantVM

投递至Linux社区的RFC patch链接:https://lore.kernel.org/all/20260605100031.834938-1-muliang.shou@sjtu.edu.cn/T/#t

GVM-Kernel仓库:https://github.com/GiantVM/GVM-kernel

GVM-qemu仓库:https://github.com/GiantVM/GVM-qemu

TCP模式的GiantVM尝鲜版本,交大网盘链接(提取码qemu):https://pan.sjtu.edu.cn/web/share/b78050c85dbd20d2dfbc5bac2f3838df

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  1. CONNECT:[ UseTime:0.000649s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000957s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000410s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000281s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000603s ]
  6. SELECT * FROM `set` [ RunTime:0.000187s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000603s ]
  8. SELECT * FROM `article` WHERE `id` = 498651 LIMIT 1 [ RunTime:0.005457s ]
  9. UPDATE `article` SET `lasttime` = 1783021745 WHERE `id` = 498651 [ RunTime:0.007153s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 67 LIMIT 1 [ RunTime:0.000275s ]
  11. SELECT * FROM `article` WHERE `id` < 498651 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000488s ]
  12. SELECT * FROM `article` WHERE `id` > 498651 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000360s ]
  13. SELECT * FROM `article` WHERE `id` < 498651 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000857s ]
  14. SELECT * FROM `article` WHERE `id` < 498651 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001712s ]
  15. SELECT * FROM `article` WHERE `id` < 498651 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.033832s ]
0.122434s