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Introduction

Xen is a free and open source type-1 hypervisor.  The Xen hypervisor is developed as a Linux Foundation project as part of the Xen Project.

On AMD-Xilinx devices, Xen runs as part of Arm execution-level 2 (EL2).  Xen hypervisor consists of three components:

  1. Xen Core - the central management engine of the Xen hypervisor
  2. Xen Domain 0 (Dom0) - the primary control domain.  This domain hosts Xen utilities used to manage the lifecycle of User Domains
  3. One or more User Domains (DomU) - the various user/application domains.  These domains run user applications and operating systems.

Using Advanced Xen Topologies

AMD-Xilinx devices support advanced features on Arm platforms that provide additional performance benefits. The table below lists important system features and the first Xilinx Xen release that makes them available.
FeatureDescriptionFirst Xen release
Dom0lessDom0less functionality allows Xen to immediately start up one or more DomU's based on a devicetree-based system topology description.  This feature allows Xen-based systems to boot more rapidly and predictably than Dom0-based systems.2019.1
Cache ColoringCache Coloring functionality maps hardware cache lines to specific Xen DomU's to prevent cache and memory thrashing.  This feature allows Xen-based systems, particularly those sensitive to interrupt latency and bare-metal performance, to operate more efficiently.2020.1


Additional Commercial Support and Professional Services

Xilinx recommends our Premier Partner: DornerWorks to customers seeking support beyond the example designs described above. DornerWorks has worked with customers to solve complex system problems including new OS support, frontend drivers, performance optimization, DMA accesses, and inter-OS communications.

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