Re: KVM and Prempt?

Re: KVM and Prempt?

[Back, Michael (ext)]

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2.6.31.1 should be 2.6.23.1 - sorry

> _____________________________________________ 
> Von: 	Back, Michael (ext)  
> Gesendet:	Friday, October 19, 2007 3:16 PM
> An:	'kvm-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org'
> Betreff:	KVM and Prempt?
> 
> 
> Hallo,
> I tried to run Windows XP with KVM on Linux 2.6.31.1 on a AMD Opteron and on a Intel Xeon, on both it works fine!
> 
> After this test I patch the kernel with the current prempt-patch and on both it doesn't works!
> -> After a very short time - I could see the windows startup screen - the complied system froze!
> 
> Has someone ever tried to do the same and it works?
> Or will KVM with Windows on a prempt kernel 
> - never work?
> - maybe work in the future?
> - should now work but this .. and this > ...>  should be done and consider?
> 
> With best regards,
> Michael Back
> 
> #########################
> ASTRUM IT GmbH 
> Michael Back
> 
> Dipl.-Ing. Univ. 
> software engineer
> Projectmanagement
> 
> Am Wolfsmantel 46
> 91058 Erlangen, Germany 
> Tel.: +49 (91 31) 94 08 - 374 
> Fax: +49 (91 31) 94 08 - 108 
> <mailto:HYPERLINK "mailto:Michael.Back-uO8URJBSKRghFhg+JK9F0w@public.gmane.org" Michael.Back-uO8URJBSKRghFhg+JK9F0w@public.gmane.org <mailto:HYPERLINK > > 
> 
> contact address by Siemens 
> Siemens AG
> Medical Solutions
> MED MRZ
> Allee am Roethelheimpark 2
> 91052 Erlangen, Germany
> Tel.: +49 (9131) 84-5307
> Fax: +49 (9131) 84-8767
> <mailto:HYPERLINK "mailto:Michael.Back.ext-kv7WeFo6aLtBDgjK7y7TUQ@public.gmane.org" Michael.Back.ext-kv7WeFo6aLtBDgjK7y7TUQ@public.gmane.org <mailto:HYPERLINK > >
> 
> Siemens Aktiengesellschaft: Chairman of the Supervisory Board: Gerhard Cromme; Managing Board: Peter Loescher, Chairman, President and Chief Executive Officer; 
> Heinrich Hiesinger, Joe Kaeser, Rudi Lamprecht, Eduardo Montes, Juergen Radomski, Erich R. Reinhardt, Hermann Requardt, Uriel J. Sharef, Peter Y. Solmssen, Klaus Wucherer;
>  Registered offices: Berlin and Munich; Commercial registries: Berlin Charlottenburg, HRB 12300, Munich, HRB 6684; WEEE-Reg.-No. DE 23691322
> 

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Re: KVM and Prempt?

[Gregory Haskins]

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Hi Michael,

On Fri, 2007-10-19 at 15:32 +0200, Back, Michael (ext) wrote:
> 
> 
> 2.6.31.1 should be 2.6.23.1 - sorry
> 
> _____________________________________________  
> Von:    Back, Michael (ext)   
> Gesendet:       Friday, October 19, 2007 3:16 PM 
> An:     'kvm-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org' 
> Betreff:        KVM and Prempt?
> 
> 
> Hallo, 
> I tried to run Windows XP with KVM on Linux 2.6.31.1 on a AMD Opteron
> and on a Intel Xeon, on both it works fine!
> 
> After this test I patch the kernel with the current prempt-patch and
> on both it doesn't works! 

Are you referring to the -rt patch?

> -> After a very short time - I could see the windows startup screen -
> the complied system froze!
> 
> Has someone ever tried to do the same and it works? 
> Or will KVM with Windows on a prempt kernel  
> - never work? 
> - maybe work in the future? 
> - should now work but this .. and this … should be done and consider?
> 
> With best regards, 
> Michael Back
> 
> ######################### 
> ASTRUM IT GmbH
> Michael Back
> 
> Dipl.-Ing. Univ.
> software engineer
> Projectmanagement
> 
> Am Wolfsmantel 46
> 91058 Erlangen, Germany
> Tel.: +49 (91 31) 94 08 - 374
> Fax: +49 (91 31) 94 08 - 108  
> <mailto:HYPERLINK "mailto:Michael.Back-uO8URJBSKRghFhg+JK9F0w@public.gmane.org"
> Michael.Back-uO8URJBSKRghFhg+JK9F0w@public.gmane.org>  
> 
> contact address by Siemens
> Siemens AG
> Medical Solutions
> MED MRZ
> Allee am Roethelheimpark 2
> 91052 Erlangen, Germany
> Tel.: +49 (9131) 84-5307
> Fax: +49 (9131) 84-8767
> <mailto:HYPERLINK "mailto:Michael.Back.ext-kv7WeFo6aLtBDgjK7y7TUQ@public.gmane.org"
> Michael.Back.ext-kv7WeFo6aLtBDgjK7y7TUQ@public.gmane.org>
> 
> Siemens Aktiengesellschaft: Chairman of the Supervisory Board: Gerhard
> Cromme; Managing Board: Peter Loescher, Chairman, President and Chief
> Executive Officer; 
> 
> Heinrich Hiesinger, Joe Kaeser, Rudi Lamprecht, Eduardo Montes,
> Juergen Radomski, Erich R. Reinhardt, Hermann Requardt, Uriel J.
> Sharef, Peter Y. Solmssen, Klaus Wucherer;
> 
>  Registered offices: Berlin and Munich; Commercial registries: Berlin
> Charlottenburg, HRB 12300, Munich, HRB 6684; WEEE-Reg.-No. DE 23691322
> 
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> _______________________________________________ kvm-devel mailing list kvm-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org https://lists.sourceforge.net/lists/listinfo/kvm-devel

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Re: KVM and Prempt?

[Back, Michael (ext)]

 
Hi Gregory,

>Hi Michael,

>On Fri, 2007-10-19 at 15:32 +0200, Back, Michael (ext) wrote:
>> 
>> 
>> 2.6.31.1 should be 2.6.23.1 - sorry
>> 
>> _____________________________________________  
>> Von:    Back, Michael (ext)   
>> Gesendet:       Friday, October 19, 2007 3:16 PM 
>> An:     'kvm-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org' 
>> Betreff:        KVM and Prempt?
>> 
>> 
>> Hallo, 
>> I tried to run Windows XP with KVM on Linux 2.6.31.1 on a AMD Opteron
>> and on a Intel Xeon, on both it works fine!
>> 
>> After this test I patch the kernel with the current prempt-patch and
>> on both it doesn't works! 

>Are you referring to the -rt patch?

Yes, I take the patch from
http://www.kernel.org/pub/linux/kernel/projects/rt/

>> -> After a very short time - I could see the windows startup screen -
>> the complied system froze!
>> 
>> Has someone ever tried to do the same and it works? 
>> Or will KVM with Windows on a prempt kernel  
>> - never work? 
>> - maybe work in the future? 
>> - should now work but this .. and this ... should be done and
consider?
>> 
>> With best regards, 
>> Michael Back
>> 
>> ######################### 
>> ASTRUM IT GmbH
>> Michael Back
>> 
>> Dipl.-Ing. Univ.
>> software engineer
>> Projectmanagement
>> 
>> Am Wolfsmantel 46
>> 91058 Erlangen, Germany
>> Tel.: +49 (91 31) 94 08 - 374
>> Fax: +49 (91 31) 94 08 - 108  
>> <mailto:HYPERLINK "mailto:Michael.Back-uO8URJBSKRghFhg+JK9F0w@public.gmane.org"
>> Michael.Back-uO8URJBSKRghFhg+JK9F0w@public.gmane.org>  
>> 
>> contact address by Siemens
>> Siemens AG
>> Medical Solutions
>> MED MRZ
>> Allee am Roethelheimpark 2
>> 91052 Erlangen, Germany
>> Tel.: +49 (9131) 84-5307
>> Fax: +49 (9131) 84-8767
>> <mailto:HYPERLINK "mailto:Michael.Back.ext-kv7WeFo6aLtBDgjK7y7TUQ@public.gmane.org"
>> Michael.Back.ext-kv7WeFo6aLtBDgjK7y7TUQ@public.gmane.org>
>> 
>> Siemens Aktiengesellschaft: Chairman of the Supervisory Board:
Gerhard
>> Cromme; Managing Board: Peter Loescher, Chairman, President and Chief
>> Executive Officer; 
>> 
>> Heinrich Hiesinger, Joe Kaeser, Rudi Lamprecht, Eduardo Montes,
>> Juergen Radomski, Erich R. Reinhardt, Hermann Requardt, Uriel J.
>> Sharef, Peter Y. Solmssen, Klaus Wucherer;
>> 
>>  Registered offices: Berlin and Munich; Commercial registries: Berlin
>> Charlottenburg, HRB 12300, Munich, HRB 6684; WEEE-Reg.-No. DE
23691322
>> 
>>
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Re: KVM and Prempt?

[Gregory Haskins]

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On Fri, 2007-10-19 at 16:17 +0200, Back, Michael (ext) wrote:

> >Are you referring to the -rt patch?
> 
> Yes, I take the patch from
> http://www.kernel.org/pub/linux/kernel/projects/rt/
> 

Ah, yes.  There were problems in the past with running KVM on -rt if you
have the full kit enabled.  Its possible they are still not fixed.

I had patches to address this issue for an older KVM and had it up and
running on a full PREEMPT_RT kernel, but they have become quite stale at
this point.  I will be picking up this work again sometime in the near
future, so watch this space.

Are you building KVM as a module from the -rt tree, or as an external
module?

-Greg

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Re: KVM and Prempt?

[Back, Michael (ext)]

> -----Ursprüngliche Nachricht-----
> Von: Gregory Haskins [mailto:ghaskins-Et1tbQHTxzrQT0dZR+AlfA@public.gmane.org] 
> Gesendet: Friday, October 19, 2007 5:27 PM
> An: Back, Michael (ext)
> Cc: kvm-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org
> Betreff: Re: AW: [kvm-devel] KVM and Prempt?
> 
> On Fri, 2007-10-19 at 16:17 +0200, Back, Michael (ext) wrote:
> 
> > >Are you referring to the -rt patch?
> > 
> > Yes, I take the patch from
> > http://www.kernel.org/pub/linux/kernel/projects/rt/
> > 
> 
> Ah, yes.  There were problems in the past with running KVM on 
> -rt if you
> have the full kit enabled.  Its possible they are still not fixed.
> 
> I had patches to address this issue for an older KVM and had it up and
> running on a full PREEMPT_RT kernel, but they have become 
> quite stale at
> this point.  I will be picking up this work again sometime in the near
> future, so watch this space.
> 
> Are you building KVM as a module from the -rt tree, or as an external
> module?

I use a external module, last try was kvm-46!

Michael

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Re: KVM and Prempt?

[Avi Kivity]

Back, Michael (ext) wrote:
>> -----Ursprüngliche Nachricht-----
>> Von: Gregory Haskins [mailto:ghaskins-Et1tbQHTxzrQT0dZR+AlfA@public.gmane.org] 
>> Gesendet: Friday, October 19, 2007 5:27 PM
>> An: Back, Michael (ext)
>> Cc: kvm-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org
>> Betreff: Re: AW: [kvm-devel] KVM and Prempt?
>>
>> On Fri, 2007-10-19 at 16:17 +0200, Back, Michael (ext) wrote:
>>
>>     
>>>> Are you referring to the -rt patch?
>>>>         
>>> Yes, I take the patch from
>>> http://www.kernel.org/pub/linux/kernel/projects/rt/
>>>
>>>       
>> Ah, yes.  There were problems in the past with running KVM on 
>> -rt if you
>> have the full kit enabled.  Its possible they are still not fixed.
>>
>> I had patches to address this issue for an older KVM and had it up and
>> running on a full PREEMPT_RT kernel, but they have become 
>> quite stale at
>> this point.  I will be picking up this work again sometime in the near
>> future, so watch this space.
>>
>> Are you building KVM as a module from the -rt tree, or as an external
>> module?
>>     
>
> I use a external module, last try was kvm-46!
>
>   

Make sure CONFIG_PREEMPT_NOTIFIER is selected in your .config.  You'll
have to adjust Kconfig or select the in-tree kvm for that.

-- 
Do not meddle in the internals of kernels, for they are subtle and quick to panic.


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Re: KVM and Prempt?

[Back, Michael (ext)]

> -----Ursprüngliche Nachricht-----
> Von: kvm-devel-bounces-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org 
> [mailto:kvm-devel-bounces-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org] Im Auftrag 
> von Avi Kivity
> Gesendet: Monday, October 22, 2007 9:40 AM
> An: Back, Michael (ext)
> Cc: kvm-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org
> Betreff: Re: [kvm-devel] KVM and Prempt?
> 
> Back, Michael (ext) wrote:
> >> -----Ursprüngliche Nachricht-----
> >> Von: Gregory Haskins [mailto:ghaskins-Et1tbQHTxzrQT0dZR+AlfA@public.gmane.org] 
> >> Gesendet: Friday, October 19, 2007 5:27 PM
> >> An: Back, Michael (ext)
> >> Cc: kvm-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org
> >> Betreff: Re: AW: [kvm-devel] KVM and Prempt?
> >>
> >> On Fri, 2007-10-19 at 16:17 +0200, Back, Michael (ext) wrote:
> >>
> >>     
> >>>> Are you referring to the -rt patch?
> >>>>         
> >>> Yes, I take the patch from
> >>> http://www.kernel.org/pub/linux/kernel/projects/rt/
> >>>
> >>>       
> >> Ah, yes.  There were problems in the past with running KVM on 
> >> -rt if you
> >> have the full kit enabled.  Its possible they are still not fixed.
> >>
> >> I had patches to address this issue for an older KVM and 
> had it up and
> >> running on a full PREEMPT_RT kernel, but they have become 
> >> quite stale at
> >> this point.  I will be picking up this work again sometime 
> in the near
> >> future, so watch this space.
> >>
> >> Are you building KVM as a module from the -rt tree, or as 
> an external
> >> module?
> >>     
> >
> > I use a external module, last try was kvm-46!
> >
> >   
> 
> Make sure CONFIG_PREEMPT_NOTIFIER is selected in your .config.  You'll
> have to adjust Kconfig or select the in-tree kvm for that.

Is there a possibility to check, if CONFIG_PREEMPT_NOTIFIER correct selected and compiled in the kernel/modules? 

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Re: KVM and Prempt?

[Avi Kivity]

Back, Michael (ext) wrote:
>>>   
>>>       
>> Make sure CONFIG_PREEMPT_NOTIFIER is selected in your .config.  You'll
>> have to adjust Kconfig or select the in-tree kvm for that.
>>     
>
> Is there a possibility to check, if CONFIG_PREEMPT_NOTIFIER correct selected and compiled in the kernel/modules? 
>   

The external module code checks CONFIG_PREEMPT_NOTIFIER, and emulates 
preempt notifiers if not present in the host kernel.  But the preempt 
notifier emulation has not been tested with -rt and may be broken there.

-- 
error compiling committee.c: too many arguments to function


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Re: KVM and Prempt?

[Back, Michael (ext)]

 

> -----Ursprüngliche Nachricht-----
> Von: Avi Kivity [mailto:avi-atKUWr5tajBWk0Htik3J/w@public.gmane.org] 
> Gesendet: Monday, October 22, 2007 1:52 PM
> An: Back, Michael (ext)
> Cc: kvm-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org
> Betreff: Re: AW: [kvm-devel] KVM and Prempt?
> 
> Back, Michael (ext) wrote:
> >>>   
> >>>       
> >> Make sure CONFIG_PREEMPT_NOTIFIER is selected in your 
> .config.  You'll
> >> have to adjust Kconfig or select the in-tree kvm for that.
> >>     
> >
> > Is there a possibility to check, if CONFIG_PREEMPT_NOTIFIER 
> correct selected and compiled in the kernel/modules? 
> >   
> 
> The external module code checks CONFIG_PREEMPT_NOTIFIER, and emulates 
> preempt notifiers if not present in the host kernel.  But the preempt 
> notifier emulation has not been tested with -rt and may be 
> broken there.
> 

Greate now it works on Intel!
Now CONFIG_PREEMPT_NOTIFIERS in my .config and I used the newerst KVM (48).
My next test is on AMD - mybe it works too!?

Thanks
Michael

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Re: KVM and Prempt?

[Back, Michael (ext)]

With the CONFIG_PREEMPT_NOTIFIERS=y (Kconfig modification) and kvm-48 it works on AMD too!

Only the smp-option doesn't work korrect, but this is no problem for my tests :-)

Thanks for help!

With best regards,
Michael


> -----Ursprüngliche Nachricht-----
> Von: Gregory Haskins [mailto:ghaskins-Et1tbQHTxzrQT0dZR+AlfA@public.gmane.org] 
> Gesendet: Friday, October 19, 2007 5:27 PM
> An: Back, Michael (ext)
> Cc: kvm-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org
> Betreff: Re: AW: [kvm-devel] KVM and Prempt?
> 
> On Fri, 2007-10-19 at 16:17 +0200, Back, Michael (ext) wrote:
> 
> > >Are you referring to the -rt patch?
> > 
> > Yes, I take the patch from
> > http://www.kernel.org/pub/linux/kernel/projects/rt/
> > 
> 
> Ah, yes.  There were problems in the past with running KVM on 
> -rt if you
> have the full kit enabled.  Its possible they are still not fixed.
> 
> I had patches to address this issue for an older KVM and had it up and
> running on a full PREEMPT_RT kernel, but they have become 
> quite stale at
> this point.  I will be picking up this work again sometime in the near
> future, so watch this space.
> 
> Are you building KVM as a module from the -rt tree, or as an external
> module?
> 
> -Greg
> 

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KVM and Prempt?

[Back, Michael (ext)]

[-- Attachment #1.1: Type: text/plain, Size: 1781 bytes --]


Hallo,
I tried to run Windows XP with KVM on Linux 2.6.31.1 on a AMD Opteron and on a Intel Xeon, on both it works fine!

After this test I patch the kernel with the current prempt-patch and on both it doesn't works!
-> After a very short time - I could see the windows startup screen - the complied system froze!

Has someone ever tried to do the same and it works?
Or will KVM with Windows on a prempt kernel 
- never work?
- maybe work in the future?
- should now work but this .. and this ... should be done and consider?

With best regards,
Michael Back

#########################
ASTRUM IT GmbH 
Michael Back

Dipl.-Ing. Univ. 
software engineer
Projectmanagement

Am Wolfsmantel 46
91058 Erlangen, Germany 
Tel.: +49 (91 31) 94 08 - 374 
Fax: +49 (91 31) 94 08 - 108 
<mailto:HYPERLINK "mailto:Michael.Back-uO8URJBSKRghFhg+JK9F0w@public.gmane.org" Michael.Back-uO8URJBSKRghFhg+JK9F0w@public.gmane.org <mailto:HYPERLINK > > 

contact address by Siemens 
Siemens AG
Medical Solutions
MED MRZ
Allee am Roethelheimpark 2
91052 Erlangen, Germany
Tel.: +49 (9131) 84-5307
Fax: +49 (9131) 84-8767
<mailto:HYPERLINK "mailto:Michael.Back.ext-kv7WeFo6aLtBDgjK7y7TUQ@public.gmane.org" Michael.Back.ext-kv7WeFo6aLtBDgjK7y7TUQ@public.gmane.org <mailto:HYPERLINK > >

Siemens Aktiengesellschaft: Chairman of the Supervisory Board: Gerhard Cromme; Managing Board: Peter Loescher, Chairman, President and Chief Executive Officer; 
Heinrich Hiesinger, Joe Kaeser, Rudi Lamprecht, Eduardo Montes, Juergen Radomski, Erich R. Reinhardt, Hermann Requardt, Uriel J. Sharef, Peter Y. Solmssen, Klaus Wucherer;
 Registered offices: Berlin and Munich; Commercial registries: Berlin Charlottenburg, HRB 12300, Munich, HRB 6684; WEEE-Reg.-No. DE 23691322


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