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From:   bugzilla-daemon@bugzilla.kernel.org
To:     kvm@vger.kernel.org
Subject: [Bug 206579] KVM with passthrough generates "BUG: kernel NULL
 pointer dereference" and crashes
Date:   Fri, 28 Feb 2020 00:20:59 +0000
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X-Bugzilla-Product: Virtualization
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X-Bugzilla-Who: anthonysanwo@googlemail.com
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Message-ID: <bug-206579-28872-otxLvv0FsD@https.bugzilla.kernel.org/>
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https://bugzilla.kernel.org/show_bug.cgi?id=206579

--- Comment #30 from Anthony (anthonysanwo@googlemail.com) ---
(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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