linux-kernel - RE: [Xen-devel] Re: Xen is a feature

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Date:	Fri, 29 May 2009 16:09:19 -0700
From:	"Nakajima, Jun" <jun.nakajima@...el.com>
To:	Andi Kleen <andi@...stfloor.org>,
	George Dunlap <george.dunlap@...citrix.com>
CC:	"jeremy@...p.org" <jeremy@...p.org>,
	"xen-devel@...ts.xensource.com" <xen-devel@...ts.xensource.com>,
	Keir Fraser <Keir.Fraser@...citrix.com>,
	"x86@...nel.org" <x86@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [Xen-devel] Re: Xen is a feature

On 5/29/2009 11:34:40 AM, Andi Kleen wrote:
> George Dunlap <george.dunlap@...citrix.com> writes:
>
> cc list from hell trimmed.
>
> > allowing Linux to run as dom0 *is* improving Linux.  The lack of
> > dom0 support is at this moment making life more difficult for a huge
> > number of Linux users who use Xen, including Mozilla, Debian, and Amazon.
> > Adding dom0 support would make Linux even more useful to a wide
> > variety of people not using Xen at the moment.
>
> Perhaps one way to address this problem would be to make the Dom0
> interface less intrusive for the host OS?
>
> Maybe impression last time I looked was that there was huge potential
> of improvement in this area. For example the PAT issue recently
> discussed was completely unnecessary.  Or if you added a "VT/SVM only"
> Dom0 mode I'm sure the interface would be significantly cleaner too.
> If you can come up with a slim clean interface the chances for actual
> integration would be likely much higher.

I think we still need some (or all?) of additional dom0 PV ops even for HVM (Hardware-based VM) dom0. Hardware-based virtualization can significantly clean up the CPU-related PV ops (including some for local APIC), but they have nothing to do with dom0.

Some hooks in the host could be removed by reusing the HVM-specific code with modifications to the virtualization logic, but I think people need to tell which specific ones are intrusive, to be fair.

             .
Jun Nakajima | Intel Open Source Technology Center
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