[Bug 206579] KVM with passthrough generates "BUG: kernel NULL pointer dereference" and crashes

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https://bugzilla.kernel.org/show_bug.cgi?id=206579

--- Comment #30 from Anthony (anthonysanwo@xxxxxxxxxxxxxx) ---
(In reply to muncrief from comment #29)
> I have to knock off for today gentlemen, but just wanted to let you know
> that if I disable nested virtualization in the host-passthrough
> configuration I get the same avic_inhibit_reasons value as the EPYC-IBPB
> configuration. So instead of "20 28" for host-passthrough I get the same "16
> 24" as EPYC.
> 
> I also saw Anthony's comment about synic so I turned it off in both
> configurations with "<synic state='off'/>", but it didn't affect anything on
> my system. I think it's actually off by default though because when I tried
> to turn it on with "<synic state='on'/>" I got an error when trying to save
> the XML.

Am guessing it's likely complaining about stimer not being enabled. To use
synic you need 
<stimer state="on"/>

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