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Re: [Xen-users] can Xen coexist/cooperate with a windows/linux dual-boo

To: Nick Couchman <Nick.Couchman@xxxxxxxxx>
Subject: Re: [Xen-users] can Xen coexist/cooperate with a windows/linux dual-boot system?
From: chris <tknchris@xxxxxxxxx>
Date: Mon, 28 Dec 2009 14:41:06 -0500
Cc: "Fajar A. Nugraha" <fajar@xxxxxxxxx>, richard heade <richard.heade@xxxxxxxxx>, Xen User-List <xen-users@xxxxxxxxxxxxxxxxxxx>
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I've read about the enlightened mode before but poking around in windows I wasn't able to find it. Is it in all versions of server 2008 or just certain editions? What if anything needs to be done to activate this? How does it compare to gplpv? I'd be curious to play around with it but haven't found any specifics.


On Mon, Dec 28, 2009 at 1:17 PM, Nick Couchman <Nick.Couchman@xxxxxxxxx> wrote:
>>> On 2009/12/27 at 20:22, "Fajar A. Nugraha" <fajar@xxxxxxxxx> wrote:
> On Mon, Dec 28, 2009 at 9:34 AM, richard heade <richard.heade@xxxxxxxxx> wrote:
>> thanks for the response, but it leaves me wondering what's the point of
>> full virtualization.
> Let's see ... hardware consolidation? cloud computing? hosted vps?

I think the question, more specifically, is why use full virutalization (HVM) instead of paravirtualization?  The answers you gave apply to the question, "Why use virtualization at all?"  However, as far as Full vs. Para, the answer is that Paravirtualization is much more efficient in resource utilization, but full virtualization allows for running operating systems that are not "aware" of the fact that they are virtualized or are not compatible with Xen's idea of paravirtualization.

>> I can install the tweaked  OS for
>> paravirtualization, or I can tweak the hardware configuration for an
>> already installed OS for full virtualization.  Either way I can't go
>> back to the original OS when I, as occasionally happens, get my linux
>> system hosed up.
> That's because you use windows. Seriously.
> You should ask MS if they provide a solution for what you're trying to
> achieve, but I doubt you'd get satisfactory response even with their
> Hyper-V.

Ha!  I'd love to see Microsoft provide a Xen-compatible PV kernel, but I'm not holding my breath - I can see them only doing this in a Hyper-V world, but I think "enlightened" Windows essentially already does this.  Unfortunately it isn't a true PV kernel, which means you still need HVM support for Xen.


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