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

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Message-ID: <20090603183622.0219db1d@lxorguk.ukuu.org.uk>
Date:	Wed, 3 Jun 2009 18:36:22 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	"Chris Friesen" <cfriesen@...tel.com>
Cc:	Ingo Molnar <mingo@...e.hu>, Steven Rostedt <rostedt@...dmis.org>,
	George Dunlap <george.dunlap@...citrix.com>,
	David Miller <davem@...emloft.net>,
	"jeremy@...p.org" <jeremy@...p.org>,
	Dan Magenheimer <dan.magenheimer@...cle.com>,
	"avi@...hat.com" <avi@...hat.com>,
	"xen-devel@...ts.xensource.com" <xen-devel@...ts.xensource.com>,
	"x86@...nel.org" <x86@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Keir Fraser <Keir.Fraser@...citrix.com>,
	"torvalds@...ux-foundation.org" <torvalds@...ux-foundation.org>,
	"gregkh@...e.de" <gregkh@...e.de>,
	"kurt.hackel@...cle.com" <kurt.hackel@...cle.com>,
	Ian Pratt <Ian.Pratt@...citrix.com>,
	"xen-users@...ts.xensource.com" <xen-users@...ts.xensource.com>,
	ksrinivasan <ksrinivasan@...ell.com>,
	"EAnderson@...ell.com" <EAnderson@...ell.com>,
	"wimcoekaerts@...mekes.net" <wimcoekaerts@...mekes.net>,
	Stephen Spector <stephen.spector@...rix.com>,
	"jens.axboe@...cle.com" <jens.axboe@...cle.com>,
	"npiggin@...e.de" <npiggin@...e.de>
Subject: Re: Merge Xen (the hypervisor) into Linux

On Wed, 03 Jun 2009 11:31:13 -0600
"Chris Friesen" <cfriesen@...tel.com> wrote:

> Ingo Molnar wrote:
> 
> > A lot of Xen legacies could be dropped: the crazy ring1 hack on 
> > 32-bit, the various wide interfaces to make pure-software 
> > virtualization limp along. All major CPUs shipped with hardware 
> > virtualization support in the past 2-3 years, so the availability of 
> > VMX and SVM can be taken for granted for such a project.
> 
> That's a pretty bold statement.  I have five x86 machines in my house
> currently being used, and none of them support VMX/SVM.
> 
> At least some Lenovo laptops disable VMX in the BIOS with no way to
> enable it.  Some of the Core2Duo chips don't support VMX at all.

Ditto some Atom cpus which in turn means you can't run kvm on all the
netbooks right now - which is one place its very useful.

> I think Xen without paravirtualization would be a serious degradation of
> usefulness.

At that point you can just use kvm anyway.
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