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KVM Switch Virtualization Technology

KVM can refer to either Kernel-based Virtual Machine, a Linux virtualization technology, or a KVM switch, a hardware device for controlling multiple computers from a single keyboard, monitor, and mouse.

KVM in Virtualization

KVM (Kernel-based Virtual Machine) is an open-source virtualization technology integrated into the Linux kernel that allows a physical Linux host to function as a hypervisor . It enables users to run multiple isolated virtual machines (VMs) on a single physical server, each with its own operating system, kernel, CPU, memory, and storage resources . KVM leverages hardware virtualization features like Intel VT-x or AMD-V for high performance and security . Key features include:

  • Full OS virtualization: Each VM behaves like a standalone system, allowing custom kernels, modules, and software stacks .
  • Resource isolation: CPU, RAM, and storage are allocated per VM, ensuring security and stability .
  • Advanced management: Supports live migration, snapshots, NUMA optimization, and integration with tools like libvirt, virt-manager, and Proxmox VE .
  • Security: Uses SELinux and sVirt to enforce isolation and prevent unauthorized access between VMs . KVM is widely used in server consolidation, cloud infrastructure, development, and testing environments, providing near-native performance and flexibility for Linux, Windows, BSD, and other guest operating systems .

KVM Switch

A KVM switch (Keyboard, Video, Mouse) is a hardware device that allows a user to control multiple computers from a single set of peripherals . It is commonly used in data centers, server rooms, and multi-computer environments. Key aspects include:

  • Functionality: Switches the keyboard, monitor, and mouse between multiple computers, often using hotkeys or buttons .
  • Types: Includes basic emulated USB KVMs, dedicated USB console ports, and advanced Dynamic Device Mapping (DDM) KVMs that maintain device functionality across all connected systems .
  • Applications: Ideal for managing multiple servers efficiently, reducing desk clutter, and enabling remote access in secure or controlled environments .
  • Cable management: Modern KVM switches often use combined cables for keyboard, video, and mouse to simplify connections and reduce costs .

Key Differences

FeatureKVM (Virtualization)KVM Switch
TypeSoftware/Kernel-basedHardware device
PurposeRun multiple virtual machines on a single hostControl multiple computers from one console
EnvironmentVirtualized servers, cloud, developmentData centers, server rooms, multi-PC setups
FunctionalityHardware virtualization, VM management, isolationPeripheral sharing, hotkey switching, remote access
PlatformsLinux host, supports multiple guest OSAny connected computers, OS-agnostic

In summary, KVM virtualization is a software solution for creating and managing virtual machines, while a KVM switch is a hardware tool for controlling multiple physical computers from a single keyboard, monitor, and mouse. Both share the acronym but serve entirely different purposes in computing environments .

KVM Switch Virtualization Technology - TKMM Photonics Systems Sp. z o.o. [PDF]

KVM switch

OverviewComputer sharing devicesNameTypesUseVideo bandwidthMonitorPassive and active (electronic) switches

KVM switches are called KVM sharing devices because two or more computers can share a single set of KVM peripherals. Computer sharing devices function in reverse compared to KVM switches; that is, a single PC can be shared by multiple monitors, keyboards, and mice. A computer sharing device is sometimes referred to as a KVM Splitter or reverse KVM switch. While not as common, this configuration is useful when the operator wants to access a single computer from two or more (usually close) locatio

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