The Turtles Project: Design and Implementation of Nested Virtualization

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The Turtles Project: Design and Implementation of Nested Virtualization

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by Muli Ben-yehuda , Michael D. Day , Zvi Dubitzky , Michael Factor , Abel Gordon , Anthony Liguori , Orit Wasserman , Ben-ami Yassour

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56 - 5 self

BibTeX

@MISC{Ben-yehuda_theturtles,
    author = {Muli Ben-yehuda and Michael D. Day and Zvi Dubitzky and Michael Factor and Abel Gordon and Anthony Liguori and Orit Wasserman and Ben-ami Yassour},
    title = {The Turtles Project: Design and Implementation of Nested Virtualization},
    year = {}
}

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Abstract

In classical machine virtualization, a hypervisor runs multiple operating systems simultaneously, each on its own virtual machine. In nested virtualization, a hypervisor can run multiple other hypervisors with their associated virtual machines. As operating systems gain hypervisor functionality—Microsoft Windows 7 already runs Windows XP in a virtual machine—nested virtualization will become necessary in hypervisors that wish to host them. We present the design, implementation, analysis, and evaluation of high-performance nested virtualization on Intel x86-based systems. The Turtles project, which is part of the Linux/KVM hypervisor, runs multiple unmodified hypervisors (e.g., KVM and VMware) and operating systems (e.g., Linux and Windows). Despite the lack of architectural support for nested virtualization in the x86 architecture, it can achieve performance that is within 6-8 % of single-level (non-nested) virtualization for common workloads, through multi-dimensional paging for MMU virtualization and multi-level device assignment for I/O virtualization. The scientist gave a superior smile before replying, “What is the tortoise standing on?” “You’re very clever, young man, very clever”, said the old lady. “But it’s turtles all the way down! ” 1 1

Keyphrases

nested virtualization turtle project virtual machine operating system multi-dimensional paging mmu virtualization multiple unmodified hypervisors classical machine virtualization young man architectural support linux kvm hypervisor multi-level device assignment x86 architecture hypervisor functionality microsoft old lady superior smile window xp intel x86-based system common workload

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