[Starlingx-discuss] WG: cpu mode

[von Hoesslin, Volker]

i have tried to extend this code:

File: /usr/lib/python2.7/site-packages/nova/objects/fields.py
Class: class CPUModel(BaseNovaEnum):

and add this two elements to list:

           "EPIC",
           "EPIC-IBPB"

restart the controller, but the same error:

 (VCpuModelFilter) Host VCPU model EPYC-IBPB required Passthrough

i'm not sure, is this code used or have to recompile some stuff?

volker...

________________________________________
Von: von Hoesslin, Volker [Volker.Hoesslin at swsn.de]
Gesendet: Montag, 21. Januar 2019 17:07
An: Chris Friesen; starlingx-discuss at lists.starlingx.io
Betreff: Re: [Starlingx-discuss] WG: cpu mode

kk, it seems it is the right way, but now i get this error here:

No valid host was found. There are not enough hosts available. compute-0: (VCpuModelFilter) Host VCPU model EPYC-IBPB required Passthrough, compute-1: (VCpuModelFilter) Host VCPU model EPYC-IBPB required Passthrough

volker...
________________________________________
Von: Chris Friesen [chris.friesen at windriver.com]
Gesendet: Montag, 21. Januar 2019 16:28
An: von Hoesslin, Volker; starlingx-discuss at lists.starlingx.io
Betreff: Re: AW: [Starlingx-discuss] WG: cpu mode

This is another assumption about Intel CPUs.  I *think* the following
should work:

On the controllers, edit
/usr/lib/python2.7/site-packages/nova/scheduler/filters/vcpu_model_filter.py
(if that's not the path it should be something pretty close).  In the
"_is_host_kvm" function add the following before the "return False" line:

     if 'svm' in info['features']:
         return True

Then, on the active controller node run "sudo sm-restart service
nova-scheduler".  This should restart the nova scheduler, and at this
point you should be able to schedule an instance.

Chris


On 1/21/2019 9:16 AM, von Hoesslin, Volker wrote:
> this would be very nice, but if i try to launch a vm with a flavor that contain the given extra-spec, i get this error:
>
> No valid host was found. There are not enough hosts available. compute-0: (VCpuModelFilter) Passthrough VCPU Model only available on 'kvm' hosts, compute-1: (VCpuModelFilter) Passthrough VCPU Model only available on 'kvm' hosts
>
> volker...
> ________________________________________
> Von: Chris Friesen [chris.friesen at windriver.com]
> Gesendet: Montag, 21. Januar 2019 16:09
> An: starlingx-discuss at lists.starlingx.io
> Betreff: Re: [Starlingx-discuss] WG: cpu mode
>
> You shouldn't need to modify nova.conf.
>
> With the current codebase you should be able to specify
> "hw:cpu_model=Passthrough" in the flavor extra-specs.
>
> Chris
>
> On 1/21/2019 8:30 AM, von Hoesslin, Volker wrote:
>> i have set "host-passthrough" in "/etc/nova/nova.conf"
>>
>> =================================
>> [DEFAULT]
>> libvirt_cpu_mode = host-passthrough
>>
>> [libvirt]
>> cpu_mode = host-passthrough
>> =================================
>>
>> and restart nove service:
>> # service nova-compute restart
>>
>> for now it works! "lscpu" on guest os shows me the AMD EPIC with all features, very nice. but after reboot the compute-node, the auto-config script change this setting back to "none":
>>
>> [libvirt]
>> cpu_mode = none
>>
>> and passthrough did not work anymore :( so how can i prevent this auto-config or define my new config as persistent?
>
>
>
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>


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