Kernel virtualization

Kernel virtualization is a technique for running multiple virtual machines on a single physical server. Each virtual machine has its own kernel, which is isolated from the kernels of other virtual machines. This allows each virtual machine to run its own operating system and applications, without affecting the other virtual machines on the same server.

How does kernel-based virtual machine work?

Kernel-based virtual machine (KVM) is a virtualization infrastructure for the Linux kernel that turns it into a hypervisor. It was merged into the mainline Linux kernel in kernel version 2.6.20, which was released on February 5, 2007.

KVM requires a processor with hardware virtualization extensions, such as Intel VT or AMD-V.

When used as a machine emulator, QEMU can launch Linux processes compiled for one CPU on another CPU. By using dynamic translation, it achieves very good performance.

When used as a virtualizer, QEMU achieves near native performance by executing the guest code directly on the host CPU.

KVM is used in virtualized environments such as OpenStack and oVirt.

KVM is also the basis for Android Studio's Emulator and Microsoft's Hyper-V. What is kernel and hypervisor? Kernel is the core of an operating system that manages the system's resources and provides common services for applications. Hypervisor is a software layer that allows multiple operating systems to share a single hardware platform. Is KVM full virtualization? Yes, KVM is full virtualization. This means that it can run unmodified guest operating systems with full access to the underlying hardware resources. Is the kernel the OS? Yes, the kernel is the OS. The kernel is responsible for managing the resources of the system, such as memory, processors, and I/O devices. The kernel is also responsible for providing a layer of abstraction between the hardware and the software, which allows the software to run on different types of hardware.

Why KVM is better than VMware? There are many reasons why KVM is often seen as being better than VMware, including the fact that KVM is open source and thus more flexible, as well as being able to run on multiple architectures. In addition, KVM has better performance than VMware in many cases, due to its lower overhead.