I/O virtualization enables time and space multiplexing of I/O devices, by mapping multiple logical I/O devices upon a smaller number of physical devices. However, due to the existence of additional virtualization layers, requesting an I/O from a guest virtual machine requires complicated sequences of operations. This leads to I/O performance losses, and makes precise timing of I/O operations unpredictable. This paper proposes a hardware I/O virtualization system, termed the Virtualized Complicated Device Controller (VCDC). This I/O system allows user applications to access and operate I/O devices directly from guest VMs, and bypasses the guest OS, the Virtual Machine Monitor (VMM) and low layer I/O drivers. We show that the VCDC efficiently reduces the software overhead and enhances the I/O performance and timing predictability. Furthermore, VCDC also exhibits good scalability that can handle I/O requests from variable number of CPUs in a system.


    Access

    Download


    Export, share and cite



    Title :

    VCDC: The Virtualized Complicated Device Controller


    Contributors:
    Jiang, Zhe (author) / Audsley, Neil (author)

    Publication date :

    2017-01-01



    Type of media :

    Conference paper


    Type of material :

    Electronic Resource


    Language :

    English



    Classification :

    DDC:    004 / 629




    Virtualized Driver Assistance

    WANG ZIRAN / KIM BAEKGYU / KOBAYASHI HIROMITSU | European Patent Office | 2020

    Free access

    Virtualized driver assistance

    WANG ZIRAN / KIM BAEKGYU / KOBAYASHI HIROMITSU | European Patent Office | 2022

    Free access

    Virtualized Driver Assistance

    WANG ZIRAN / KIM BAEKGYU / KOBAYASHI HIROMITSU | European Patent Office | 2023

    Free access

    VIRTUALIZED NAVIGATION AND COMMUNICATION RADIOS

    ESPOSITO CARL | European Patent Office | 2019

    Free access

    Virtualized Reality: Concepts and Early Results

    Kanade, T. / Narayanan, P. J. / Rander, P. W. et al. | British Library Conference Proceedings | 1995