Hypervisors execute virtualization in a way that ascertains central management of data, and this is precisely what Xen and KVM hypervisors do. A hypervisor is used by individuals or organizations that intend to merge their server space or operate additional servers without relying on the host server. VirtIO drivers: Special drivers for guest systems that are designed for the hypervisor and enable para-virtualization.When we talk about the virtualization concept, among the terms that will always come up is hypervisor technology.KVMTool: A leaner alternative to QEMU which QEMU has not yet been able to replace.In many distributions, both components are offered in a single installation package. Linux KVM uses this functionality to emulate hardware and improves its speed through para-virtualization. QEMU: This is basically an independent program for emulating computers and managing virtual machines.Libvirt also includes tools such as the command “virsh” and the Virtual Machine Manager graphical interface. Libvirt: The application programming interface (API) for interfacing with the virtual machines.It also includes the modules kvm-amd and kvm-intel which are adapted to the processors. This is the translation layer between the real and virtual hardware. Kernel extension: Contains the actual kernel.ko extension.The complete KVM package consists of multiple components: However, it is unique in that it is directly integrated into the kernel. Linux KVM is a type 2 hypervisor and uses hardware-assisted para-virtualization. Type 2 (hosted): This hypervisor is embedded in the host operating system and is enabled from there.Type 1 (bare metal): This hypervisor runs directly on the hardware being used without being embedded in an operating system.In addition, there are two different types of hypervisors: Under certain circumstances, this may need to be activated in the BIOS/UEFI. Modern processors made by Intel (Intel-VT-x) and AMD (AMD-V) have this functionality. This increases efficiency and reduces the amount of customization required for guest systems. Hardware-assisted para-virtualization: The hardware support is already integrated in the processor.Para-virtualization: The guest system interacts directly with the hypervisor and requires specially designed drivers.Therefore, no interaction with the real hardware is necessary, which also makes corresponding drivers unnecessary. Full virtualization: The hardware is completely emulated on the software side.Here are the different types of virtualization: ![]() ![]() Depending on the type of virtualization, it may be necessary to translate all the requirements of the real hardware or just the allocation of the required actions (e.g. The hypervisor is a management or translation layer between the real and virtual hardware. The hardware provided for the guest systems is either emulated by software or controlled by a hypervisor and allocated to real hardware resources. ![]() Virtualization means that one or more full operating systems (guest systems) can be run on a single host computer. To understand the Kernel-based Virtual Machine’s functions, you must first understand the basics of virtualization.
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