From: ldo@nz.invalid
On Tue, 3 Dec 2024 09:57:31 -0500, Arne Vajhøj wrote:
> I think the relevant distinction is that type 1 runs in the kernel while
> type 2 runs on the kernel.
:
Type-1, native or bare-metal hypervisors
These hypervisors run directly on the host's hardware to
control the hardware and to manage guest operating systems.
For this reason, they are sometimes called bare-metal
hypervisors. The first hypervisors, which IBM developed in the
1960s, were native hypervisors.[8] These included the test
software SIMMON and the CP/CMS operating system, the
predecessor of IBM's VM family of virtual machine operating
systems. Examples of Type-1 hypervisor include Hyper-V, Xen
and VMware ESXi.
Type-2 or hosted hypervisors
These hypervisors run on a conventional operating system (OS)
just as other computer programs do. A virtual machine monitor
runs as a process on the host, such as VirtualBox. Type-2
hypervisors abstract guest operating systems from the host
operating system, effectively creating an isolated system that
can be interacted with by the host. Examples of Type-2
hypervisor include VirtualBox and VMware Workstation.
The distinction between these two types is not always clear. For
instance, KVM and bhyve are kernel modules[9] that effectively
convert the host operating system to a type-1 hypervisor.[10]
I would say those examples contradict the definitions, since Linux with
KVM is very much a “conventional OS”, and the same would be true of the
BSDs.
But then again, that just reinforces the point that the distinction is
obsolete.
--- SoupGate-DOS v1.05
* Origin: you cannot sedate... all the things you hate (1:229/2)
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