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

["Nick Couchman" <Nick.Couchman@xxxxxxxxx>]

Enlightened mode happens automatically in Server 2008 - all editions.  There 
isn't anything to change/set - the kernel detects at boot-time that it is 
running on a Xen or Hyper-V platform and switches to Enlightened Mode.  I don't 
know if Windows 7 contains this or not - I hope so, but given Microsoft's 
attempts to lock down licensing for the client-side virtual machine O/Ss (XP, 
Vista, and 7), I wouldn't be surprised if it is only included in the Server 
O/Ss 2008 and future.

-Nick

>>> On 2009/12/28 at 12:41, chris <tknchris@xxxxxxxxx> wrote:
> 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.
> 
> Chris
> 
> 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.
>>
>> -Nick
>>
>>
>>
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