Long-Term Supported Versions

    Innovation Versions

      Introduction to StratoVirt

      Overview

      StratoVirt is an enterprise-class Virtual Machine Monitor (VMM) oriented to cloud data centers in the computing industry. It uses a unified architecture to support VM, container, and serverless scenarios. StratoVirt has competitive advantages in key technologies such as lightweight low noise, software and hardware synergy, and Rust language-level security. StratoVirt reserves component-based assembling capabilities and APIs in the architecture design. Advanced features can be flexibly assembled as required until they evolve to support standard virtualization. In this way, StratoVirt can strike a balance between feature requirements, application scenarios, and flexibility.

      Architecture Description

      The StratoVirt core architecture consists of three layers from top to bottom:

      • External API: compatible with the QEMU Monitor Protocol (QMP), has complete OCI compatibility capabilities, and supports interconnection with libvirt.
      • BootLoader: discards the traditional BIOS+GRUB boot mode to achieve fast boot in lightweight scenarios, and provides UEFI boot support for standard VMs.
      • Emulated mainboard:
        • MicroVM: Fully utilizes software and hardware collaboration capabilities, simplifies device models, and provides low-latency resource scaling capabilities.
        • Standard VM: implements UEFI boot with constructed ACPI tables. Virtio-pci and VFIO devices can be attached to greatly improve the VM I/O performance.

      Figure 1 shows the overall architecture.

      Figure 1 Overall architecture of StratoVirt

      Features

      • Highly isolated based on hardware.
      • Fast cold boot: Benefiting from the minimalist design, a microVM can be started within 50ms.
      • Low memory overhead: StratoVirt works with a memory footprint of less than 4 MB.
      • I/O enhancement: StratoVirt offers normal I/O capabilities and minimalist I/O device emulation.
      • OCI compatibility: StratoVirt works with iSula and Kata containers, and can be integrated into the Kubernetes ecosystem perfectly.
      • Multi-platform support: StratoVirt fully supports Intel and Arm platforms.
      • Extensibility: StratoVirt has interface and design for importing more features, and can be extended to support standard virtualization.
      • Security: fewer than 46 syscalls while running.

      Implementation

      Running Architecture

      • A StratoVirt VM is an independent process in Linux. The process has three types of threads: main thread, vCPU thread, and I/O thread:
        • The main thread is a cycle for asynchronously collecting and processing events from external modules, such as a vCPU thread.
        • Each vCPU has a thread to handle trap events of this vCPU.
        • I/O threads can be configured for I/O devices to improve I/O performance.

      Restrictions

      • Only the Linux operating system is supported, and the recommended kernel versions are 4.19 and 5.10.
      • Only Linux is supported as the operating system of the VM, and the recommended kernel versions are 4.19 and 5.10.
      • A maximum of 254 CPUs are supported.

      Bug Catching

      Buggy Content

      Bug Description

      Submit As Issue

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      PR

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      Bug Type
      Specifications and Common Mistakes

      ● Misspellings or punctuation mistakes;

      ● Incorrect links, empty cells, or wrong formats;

      ● Chinese characters in English context;

      ● Minor inconsistencies between the UI and descriptions;

      ● Low writing fluency that does not affect understanding;

      ● Incorrect version numbers, including software package names and version numbers on the UI.

      Usability

      ● Incorrect or missing key steps;

      ● Missing prerequisites or precautions;

      ● Ambiguous figures, tables, or texts;

      ● Unclear logic, such as missing classifications, items, and steps.

      Correctness

      ● Technical principles, function descriptions, or specifications inconsistent with those of the software;

      ● Incorrect schematic or architecture diagrams;

      ● Incorrect commands or command parameters;

      ● Incorrect code;

      ● Commands inconsistent with the functions;

      ● Wrong screenshots.

      Risk Warnings

      ● Lack of risk warnings for operations that may damage the system or important data.

      Content Compliance

      ● Contents that may violate applicable laws and regulations or geo-cultural context-sensitive words and expressions;

      ● Copyright infringement.

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      Bug Catching
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