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From: Lawrence D'Oliveiro <ldo@nz.invalid>
Newsgroups: comp.os.vms
Subject: Re: VMWARE/ESXi Linux
Date: Thu, 28 Nov 2024 01:03:05 -0000 (UTC)
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On Wed, 27 Nov 2024 19:12:45 -0500, Arne Vajhøj wrote:

> ESXi has its own proprietary kernel called VMKernel.
> 
> You can probably call it Linux inspired.
> 
> Similar file system layout. Compatible API subset (but not full
> compatible API). Similar driver architecture. Similar CLI experience
> (BusyBox provide the usual CLI interface).
> 
> But not based on Linux kernel code. And not fully compatible. And not
> all functionality (it is specialized for hypervisor role).

In other words, it originated back in the day when the difference between 
“Type 1” and “Type 2” hypervisors was important.