Virtual Drivers
Software-defined device interfaces that model hardware-like resources without a direct physical device.
Virtual does not mean imaginary
A virtual driver exposes a structured device, adapter, disk, display, or endpoint to host software. Its implementation may map to software, a hypervisor, a remote service, or another physical device.
The same contracts still apply
Virtual devices have identity, interfaces, queues, buffers, power or availability state, and completion relationships. They may omit physical transport details while retaining a host device model.
Ownership can cross boundaries
A virtual device can depend on a host process, virtual machine monitor, remote endpoint, or backing store. References should identify which component owns the represented resource and which layer reports status.
Capabilities are declared
A virtual device can expose only the features its implementation and backing environment support. Its interface should be read from descriptors and package metadata rather than inferred from a familiar physical category.
Reference facts
- Definition
- A software-defined interface presented as a device to host software.
- Possible backing
- Software, hypervisor, remote endpoint, or another physical device.
Questions and answers
Does a virtual driver require hardware?
No. It can represent a software or remote resource while implementing a device-like host interface.
Why do virtual devices have IDs?
Host software still needs identity and matching evidence to associate interfaces and software with the virtual function.