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From: Lawrence D'Oliveiro <ldo@nz.invalid>
Newsgroups: comp.arch
Subject: Re: Privilege Levels Below User
Date: Sun, 9 Jun 2024 22:41:12 -0000 (UTC)
Organization: A noiseless patient Spider
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On Sun, 09 Jun 2024 14:13:25 GMT, Scott Lurndal wrote:

> Lawrence D'Oliveiro <ldo@nz.invalid> writes:
>>On Sat, 8 Jun 2024 17:37:46 +0000, MitchAlsup1 wrote:
>>
>>> VAX was before common era Hypervisors, do you think VAX could have
>>> supported secure mode and hypervisor with their 4 levels ??
>>
>>“Virtualization” was bandied about in the 1980s more as an idle, 
>>theoretical concept rather than a practical one.
> 
> I'm quite sure that IBM would disagree with this statement.

I’m sure they would. But they invented virtualization in CP/CMS because 
their attempt at an “interactive timesharing” system, CMS, was only 
single-user. Rather than make it multiuser, they simply invented CP as a 
big hack to run multiple copies of CMS, so each user felt they had an 
entire machine to themself.

There were some privilege holes in that, as well.