windows server 2008 hyper-v on kvm

windows server 2008 hyper-v on kvm

[Evan Ingram]

hi,

running windows server 2008 on kvm as guest os. i need to install 
hyper-v on the guest os but i get the error about my processor not 
having the correct hardware virtualisation support. i read i should 
perhaps try running the kvm with '-cpu host' but i still get the same error.

any advice?
cheers

Re: windows server 2008 hyper-v on kvm

[Gleb Natapov]

On Mon, Feb 15, 2010 at 04:19:55PM +0000, Evan Ingram wrote:
> hi,
> 
> running windows server 2008 on kvm as guest os. i need to install
> hyper-v on the guest os but i get the error about my processor not
> having the correct hardware virtualisation support. i read i should
> perhaps try running the kvm with '-cpu host' but i still get the
> same error.
> 
> any advice?
KVM not yet fas all needed pieces for windows to recognise that VM
supports hyper-v. And only very small part of hyper-v spec is actually
implemented right now.

--
			Gleb.

Re: windows server 2008 hyper-v on kvm

[Rob Earhart]

I don't know enough about KVM (yet!) to know whether it virtualizes
the virtualization instructions; it's possible to do it, but it's
tricky, and I'm not sure how much of a point there would be; I'd be a
little surprised if Hyper-V ever ran with any kind of reasonable
performance on KVM.

)Rob


On Mon, Feb 15, 2010 at 9:27 AM, Gleb Natapov <gleb@redhat.com> wrote:
>
> On Mon, Feb 15, 2010 at 04:19:55PM +0000, Evan Ingram wrote:
> > hi,
> >
> > running windows server 2008 on kvm as guest os. i need to install
> > hyper-v on the guest os but i get the error about my processor not
> > having the correct hardware virtualisation support. i read i should
> > perhaps try running the kvm with '-cpu host' but i still get the
> > same error.
> >
> > any advice?
> KVM not yet fas all needed pieces for windows to recognise that VM
> supports hyper-v. And only very small part of hyper-v spec is actually
> implemented right now.
>
> --
>                        Gleb.
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Re: windows server 2008 hyper-v on kvm

[Jan Kiszka]

Gleb Natapov wrote:
> On Mon, Feb 15, 2010 at 04:19:55PM +0000, Evan Ingram wrote:
>> hi,
>>
>> running windows server 2008 on kvm as guest os. i need to install
>> hyper-v on the guest os but i get the error about my processor not
>> having the correct hardware virtualisation support. i read i should
>> perhaps try running the kvm with '-cpu host' but i still get the
>> same error.
>>
>> any advice?
> KVM not yet fas all needed pieces for windows to recognise that VM
> supports hyper-v. And only very small part of hyper-v spec is actually
> implemented right now.

I tend to think he is looking for nested virtualization. That is only
available on AMD hosts so far. If you are on AMD, I think you need to
pass -enable-nesting to qemu-kvm to enable it.

Jan

-- 
Siemens AG, Corporate Technology, CT T DE IT 1
Corporate Competence Center Embedded Linux

Re: windows server 2008 hyper-v on kvm

[Gleb Natapov]

On Mon, Feb 15, 2010 at 07:22:10PM +0100, Jan Kiszka wrote:
> Gleb Natapov wrote:
> > On Mon, Feb 15, 2010 at 04:19:55PM +0000, Evan Ingram wrote:
> >> hi,
> >>
> >> running windows server 2008 on kvm as guest os. i need to install
> >> hyper-v on the guest os but i get the error about my processor not
> >> having the correct hardware virtualisation support. i read i should
> >> perhaps try running the kvm with '-cpu host' but i still get the
> >> same error.
> >>
> >> any advice?
> > KVM not yet fas all needed pieces for windows to recognise that VM
> > supports hyper-v. And only very small part of hyper-v spec is actually
> > implemented right now.
> 
> I tend to think he is looking for nested virtualization. That is only
> available on AMD hosts so far. If you are on AMD, I think you need to
> pass -enable-nesting to qemu-kvm to enable it.
> 
I guess original poster needs to clarify what he actually means :)

--
			Gleb.

Re: windows server 2008 hyper-v on kvm

[Evan Ingram]

On 15/02/2010 18:39, Gleb Natapov wrote:
> I guess original poster needs to clarify what he actually means :)

maybe i'm getting the words wrong.

ive got an ubuntu 9.10 server with kvm installed on it. ive then 
installed windows server 2008 into kvm. i now want to install hyper-v in 
windows 2008.

Re: windows server 2008 hyper-v on kvm

[Brian Jackson]

On Monday 15 February 2010 12:59:54 Evan Ingram wrote:
> On 15/02/2010 18:39, Gleb Natapov wrote:
> > I guess original poster needs to clarify what he actually means :)
> 
> maybe i'm getting the words wrong.
> 
> ive got an ubuntu 9.10 server with kvm installed on it. ive then
> installed windows server 2008 into kvm. i now want to install hyper-v in
> windows 2008.

So you want to run hyper-v guests inside of a kvm guest? So there would be 2 
levels of virtualization? It's called nested virtualization. It only currently 
works with AMD cpus, and even then it's pretty slow unless you've got npt. 
It's also not very well tested (last I heard the only thing that worked 
reliably was kvm in kvm).


> 
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Re: windows server 2008 hyper-v on kvm

[Evan Ingram]

On 15/02/2010 19:02, Brian Jackson wrote:
>
> So you want to run hyper-v guests inside of a kvm guest? So there would be 2
> levels of virtualization? It's called nested virtualization. It only currently
> works with AMD cpus, and even then it's pretty slow unless you've got npt.
> It's also not very well tested (last I heard the only thing that worked
> reliably was kvm in kvm).
>    

yeah. i wanted to run windows remote desktop services to serve some thin 
clients, but i wanted to run it on my kvm server. the desktop 
virtualisation requires hyper-v.

Re: windows server 2008 hyper-v on kvm

[Alexander Graf]

On 15.02.2010, at 20:09, Evan Ingram wrote:

> On 15/02/2010 19:02, Brian Jackson wrote:
>> 
>> So you want to run hyper-v guests inside of a kvm guest? So there would be 2
>> levels of virtualization? It's called nested virtualization. It only currently
>> works with AMD cpus, and even then it's pretty slow unless you've got npt.
>> It's also not very well tested (last I heard the only thing that worked
>> reliably was kvm in kvm).
>>   
> 
> yeah. i wanted to run windows remote desktop services to serve some thin clients, but i wanted to run it on my kvm server. the desktop virtualisation requires hyper-v.

Running Hyper-V inside KVM is one of my big goals. Performance-wise it should be pretty good when used on an AMD K10 (4-core and newer) system, because Hyper-V 1 doesn't use nested pages anyways.

Unfortunately, last time I checked it was still broken. I haven't gotten around to spend another week on debugging it yet. I haven't gotten some minor detail about interrupt injection right I suppose. So I guess you need to live without for now :-).


Alex