linux-kernel - Re: Merge Xen (the hypervisor) into Linux

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Message-Id: <20090602.215802.149628704.davem@davemloft.net>
Date:	Tue, 02 Jun 2009 21:58:02 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	dan.magenheimer@...cle.com
Cc:	rostedt@...dmis.org, tytso@....edu, mingo@...e.hu,
	george.dunlap@...citrix.com, jeremy@...p.org, avi@...hat.com,
	xen-devel@...ts.xensource.com, x86@...nel.org,
	linux-kernel@...r.kernel.org, Keir.Fraser@...citrix.com,
	torvalds@...ux-foundation.org, gregkh@...e.de,
	kurt.hackel@...cle.com, Ian.Pratt@...citrix.com,
	xen-users@...ts.xensource.com, ksrinivasan@...ell.com,
	EAnderson@...ell.com, wimcoekaerts@...mekes.net,
	stephen.spector@...rix.com, jens.axboe@...cle.com, npiggin@...e.de
Subject: Re: Merge Xen (the hypervisor) into Linux

From: Dan Magenheimer <dan.magenheimer@...cle.com>
Date: Tue, 2 Jun 2009 21:49:58 -0700 (PDT)

> A hypervisor is not an operating system.

This is a pretty bogus statement if you ask me.

A hypervisor a software system that provides seperation between
protection realms.

It also handles exceptions and "system calls" on behalf of the other
protection realms.

I personally don't see the difference at all.  And since many
hypervisors even do cpu scheduling, the fundamental differences
converge to almost nothing.
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