[Users] nested KVM

[Mark Wu]

On 09/26/2012 12:58 AM, Nathanaël Blanchet wrote:
> Hello,
>
> I've tried many times to run a node as a guest in ovirt following 
> http://wiki.ovirt.org/wiki/Vdsm_Developers#Running_Node_as_guest_-_Nested_KVM 
> . The result is that I'm able to register such a host in engine, but 
> it is impossible to start any vm on it. If I boot on an ISO, I can see 
> the first prompt and move between the items. But since I begin the 
> installation I have a blank screen and the vm goes into pause mode in 
> vit-manager. Then I have no way else than rebooting the hypervisor 
> guest because it is impossible to resume. When I get logs on the real 
> host, I can find this :
> arning : x86Decode:1306 : Preferred CPU model Westmere not allowed by 
> hypervisor; closest supported model will be used
> Sep 25 17:11:59 khamsin libvirtd[23053]: 2012-09-25 15:11:59.384+0000: 
> 23054: warning : x86Decode:1306 : Preferred CPU model Westmere not 
> allowed by hypervisor; closest supported model will be used
> Sep 25 17:12:19 khamsin libvirtd[23053]: 2012-09-25 15:12:19.150+0000: 
> 23055: warning : x86Decode:1306 : Preferred CPU model Westmere not 
> allowed by hypervisor; closest supported model will be used
> Sep 25 17:45:48 khamsin libvirtd[23053]: 2012-09-25 15:45:48.342+0000: 
> 23058: warning : x86Decode:1306 : Preferred CPU model Westmere not 
> allowed by hypervisor; closest supported model will be used
> Sep 25 18:07:05 khamsin libvirtd[23053]: 2012-09-25 16:07:05.834+0000: 
> 23058: warning : x86Decode:1306 : Preferred CPU model Nehalem not 
> allowed by hypervisor; closest supported model will be used
> Sep 25 18:44:47 khamsin libvirtd[23053]: 2012-09-25 16:44:47.340+0000: 
> 23057: warning : x86Decode:1306 : Preferred CPU model Penryn not 
> allowed by hypervisor; closest supported model will be used
>
> As you can see, I have tried many cpu type for launching this guest 
> hypervisor, but none of them is accepted by the hypervisor. Plus, I've 
> modified each time the family type in the cluster tab, but it is the 
> same.
> On the hist:
> #virsh capabilities gives
> <cpu>
> <arch>x86_64</arch>
> <model>Westmere</model>
> <vendor>Intel</vendor>
>
> Thanks for your help


What does the command 'qemu-kvm -cpu ?' give ?   Could you please try 
the following guest cpu definition?

*
<cpu match='exact'>
   <model>core2duo</model>
  <feature policy='require' name='vmx'/>
</cpu>


*

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