Does 8.1 enable AVIC by default?

May be related to this:

https://bugzilla.redhat.com/show_bug.cgi?id=1694170

Can try disabling avic in the kvm module on the hosts and see if that
allows them to activate.

Regards,

Ryan

On Tue, May 26, 2020 at 9:11 AM Mark R <ovirtl...@beanz.33mail.com> wrote:

> Hello all,
>
> I have some EPYC servers that are not yet in production, so I wanted to go
> ahead and move them off of 4.3 (which was working) to 4.4. I flattened and
> reinstalled the hosts with CentOS 8.1 Minimal and installed all updates.
> Some very simple networking, just a bond and two iSCSI interfaces. After
> adding the oVirt 4.4 repo and installing the requirements, I run
> 'hosted-engine --deploy' and proceed through the setup. Everything looks as
> though it is going nicely and the local HE starts and runs perfectly. After
> copying the HE disks out to storage, the system tries to start it there but
> is using a different CPU definition and it's impossible to start it. At
> this point I'm stuck but hoping someone knows the fix, because this is as
> vanilla a deployment as I could attempt and it appears EPYC CPUs are a
> no-go right now with 4.4.
>
> When the HostedEngineLocal VM is running, the CPU definition is:
>   <cpu mode='custom' match='exact' check='full'>
>     <model fallback='forbid'>EPYC-IBPB</model>
>     <vendor>AMD</vendor>
>     <feature policy='require' name='x2apic'/>
>     <feature policy='require' name='tsc-deadline'/>
>     <feature policy='require' name='hypervisor'/>
>     <feature policy='require' name='tsc_adjust'/>
>     <feature policy='require' name='clwb'/>
>     <feature policy='require' name='umip'/>
>     <feature policy='require' name='arch-capabilities'/>
>     <feature policy='require' name='cmp_legacy'/>
>     <feature policy='require' name='perfctr_core'/>
>     <feature policy='require' name='wbnoinvd'/>
>     <feature policy='require' name='amd-ssbd'/>
>     <feature policy='require' name='skip-l1dfl-vmentry'/>
>     <feature policy='disable' name='monitor'/>
>     <feature policy='disable' name='svm'/>
>     <feature policy='require' name='topoext'/>
>   </cpu>
>
> Once the HostedEngine VM is defined and trying to start, the CPU
> definition is simply:
>
>   <cpu mode='custom' match='exact' check='partial'>
>     <model fallback='allow'>EPYC</model>
>     <topology sockets='16' cores='4' threads='1'/>
>     <feature policy='require' name='ibpb'/>
>     <feature policy='require' name='virt-ssbd'/>
>     <numa>
>       <cell id='0' cpus='0-63' memory='16777216' unit='KiB'/>
>     </numa>
>   </cpu>
>
> On attempts to start it, the host is logging this error:  "CPU is
> incompatible with host CPU: Host CPU does not provide required features:
> virt-ssbd".
>
> So, the HostedEngineLocal VM works because it has a requirement set for
> 'amd-ssbd' instead of 'virt-ssbd', and a VM requiring 'virt-ssbd' can't run
> on EPYC CPUs with CentOS 8.1.  As mentioned, the HostedEngine ran fine on
> oVirt 4.3 with CentOS 7.8, and on 4.3 the cpu definition also required
> 'virt-ssbd', so I can only imagine that perhaps this is due to the more
> recent 4.x kernel that I now need HE to require 'amd-ssbd' instead?
>
> Any clues to help with this? I can completely wipe/reconfigure the hosts
> as needed so I'm willing to try whatever so that I can move forward with a
> 4.4 deployment.
>
> Thanks!
> Mark
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