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: Sat, 29 Feb 2020 07:02:52 +0000 [thread overview]
Message-ID: <bug-206579-28872-fxqSiKDZJJ@https.bugzilla.kernel.org/> (raw)
In-Reply-To: <bug-206579-28872@https.bugzilla.kernel.org/>
https://bugzilla.kernel.org/show_bug.cgi?id=206579
--- Comment #39 from Anthony (anthonysanwo@googlemail.com) ---
(In reply to muncrief from comment #38)
> (In reply to Anthony from comment #37)
> > ... I just wanted to check if I am missing anything on my side as I am not
> 100% sure on how to tell avic is working looking a trace, perf stat/live. ...
>
> You can tell if avic is working by executing "perf kvm stat live" and then
> looking for "avic_incomplete_ipi" and "avic_unaccelerated_" in the VM-EXIT
> column. If it's not working you'll see "vintr" instead.
>
> By the way the way "avic_unaccelerated_" is actually
> "avic_unaccelerated_access" in the code but evidently it gets truncated in
> the perf command output.
Oh if that's the case then my understanding has just been poor as I assumed the
kvm_apicv_update_request counter should be higher to show the times where apicv
has been activated and deactivated which should also be reflected in a trace.
At least that is what it reads like to me reading this patch -
https://lore.kernel.org/patchwork/patch/1153605/
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next prev parent reply other threads:[~2020-02-29 7:02 UTC|newest]
Thread overview: 65+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-17 18:17 [Bug 206579] New: KVM with passthrough generates "BUG: kernel NULL pointer dereference" and crashes bugzilla-daemon
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