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 03:38:14 +0000 [thread overview]
Message-ID: <bug-206579-28872-B0Ol5IPWjT@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 #31 from Suravee Suthikulpanit (suravee.suthikulpanit@amd.com) ---
(In reply to muncrief from comment #27)
> Created attachment 287667 [details]
> avic_inhibit_reasons debug information
Thanks for the info
> With host-passthrough the avic_inhibit_reasons value immediately changed
> from 0 to 20, and then a few seconds later changed to 28.
>
> With the EPYC-IBPB the avic_inhibit_reasons value immediately changed from 0
> to 16, and then a few seconds later changed to 24.
24 means:
APICV_INHIBIT_REASON_IRQWIN
APICV_INHIBIT_REASON_PIT_REINJ
Looking at the QEMU command line, you might need to either:
1. Specify "-machine kernel_irqchip=split" (default to "on")
Or
2. Specify "-global kvm-pit.lost_tick_policy=discard" (default to "delay")
Please give this a try.
Suravee
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next prev parent reply other threads:[~2020-02-28 3:38 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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