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QNX Hypervisor and QNX Hypervisor for Safety
The QNX Hypervisor and QNX Hypervisor for Safety products allow you to run multiple OSs on a target system so you can separate critical and non-critical functions, support a wide variety of applications, and reduce hardware costs.
Virtual Device Developer's Guide
The Virtual Device Developer's Guide is intended for use by developers writing virtual devices (vdevs) in a QNX hypervisor system.
Advanced Topics
This chapter presents examples of more advanced vdevs implemented with QNX hypervisors.

QNX Momentics IDE User's Guide
This User's Guide describes version 8.0 of the Integrated Development Environment (IDE) that's part of the QNX Tool Suite.
QNX Software Development Platform
QNX SDP is a cross-compiling and debugging environment, including an IDE and command-line tools, for building binary images and programs for target boards running the QNX OS 8.0.
QNX Software in the Cloud
QNX Software in the Cloud enables developers to use the QNX software in Amazon Web Services (AWS) and Microsoft Azure (Azure).
QNX Toolkit for Visual Studio Code
This User's Guide describes the QNX^® Toolkit for Visual Studio Code. The guide introduces you to the QNX Toolkit by explaining the QNX development environment and how to build, run, and debug your QNX^® Operating System (OS) applications and systems.
QNX Hypervisor and QNX Hypervisor for Safety
The QNX Hypervisor and QNX Hypervisor for Safety products allow you to run multiple OSs on a target system so you can separate critical and non-critical functions, support a wide variety of applications, and reduce hardware costs.
- User's Guide
  This User's Guide explains the QNX hypervisor architecture and provides instructions for installing and running a QNX hypervisor system, changing system components and configuration, and using hypervisor features such as virtual devices (vdevs).
- Virtual Device Developer's Guide
  The Virtual Device Developer's Guide is intended for use by developers writing virtual devices (vdevs) in a QNX hypervisor system.
  - About Writing Virtual Devices
    This chapter explains the concepts you need to understand before you start writing virtual devices (vdevs) for a QNX hypervisor system.
  - The Basics: vdev trace
    This simple vdev illustrates how to implement basic vdev functionality.
  - Advanced Topics
    This chapter presents examples of more advanced vdevs implemented with QNX hypervisors.
    - Emulating hardware (vdev wdt-sp805)
      The wdt-sp805 vdev emulates a hardware watchdog for ARM platforms.
    - Running a watchdog vdev (vdev wdt-sp805)
      An emulation vdev behaves like its hardware equivalent.
    - A watchdog vdev for x86 (vdev wdt-ib700)
      The wdt-ib700 vdev emulates an IB700 watchdog timer for x86 platforms.
    - A guest-host hardware device intermediary (vdev ser8250)
      This vdev emulates an Intel 8250 UART and acts as an intermediary between the guest and an actual physical device.
    - Para-virtualized devices
      Para-virtualized devices implemented in QNX hypervisors follow the VIRTIO 1.1 and later specifications by default.
- Virtual Device Developer's API Reference
  The Virtual Device Developer's API Reference presents the QNX hypervisor public virtual device (vdev) API. It is intended for use by developers writing virtual devices (vdevs) in a QNX hypervisor system.
Typographical Conventions, Support, and Licensing
This section describes the typographical conventions used throughout the documentation, explains how to obtain technical support, and provides some information about licensing.

Advanced Topics

This chapter presents examples of more advanced vdevs implemented with QNX hypervisors.

The vdevs described in this chapter include vdevs that emulate hardware devices:

a virtual watchdog for ARM platforms — vdev wdt-sp805
a virtual watchdog for x86 platforms — vdev wdt-ib700
a vdev that emulates the Intel 8250 UART — vdev ser8250

This chapter also describes the virtio-entropy vdev, which is a para-virtualized device.

Additional information

The watchdog vdevs provided with QNX hypervisors require the qvm/wdog.h public header file. This file includes functions, definitions, and data structures used by both watchdog vdevs described in this chapter (also see the wdog.h chapter in the Virtual Device Developer's API Reference).

For more information about watchdogs in a QNX hypervisor system, see Watchdogs in the User's Guide.

Page updated: March 14, 2026