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, 18 Apr 2020 23:19:59 +0000 [thread overview]
Message-ID: <bug-206579-28872-Af8lNcEUq4@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 #60 from Anthony (anthonysanwo@googlemail.com) ---
To add hiding cpu id hypervisor seems to also cause it to not work well.
Windows also generally don't perform as well when hiding the hypervisor CPU id
on Ryzen.
Using top we see high activity in avic_vcpu_put.part.0 & avic_vcpu_load
functions and near-zero to zero activity with svm_deliver_avic_intr function.
Which suggests AVIC isn't working correctly if my sight understanding of
svm_deliver_avic_intr function is correct.
Haven't looked to in-depth but I would guess SVM/AVIC uses hypervisor cpuid as
check? to apply its optimizations or something along those lines.
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next prev parent reply other threads:[~2020-04-18 23:20 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
2020-02-18 6:45 ` [Bug 206579] " bugzilla-daemon
2020-02-18 18:54 ` bugzilla-daemon
2020-02-18 19:55 ` bugzilla-daemon
2020-02-21 14:56 ` bugzilla-daemon
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2020-02-21 21:27 ` bugzilla-daemon
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2020-02-26 2:25 ` bugzilla-daemon
2020-02-26 20:34 ` bugzilla-daemon
2020-02-27 14:49 ` bugzilla-daemon
2020-02-27 20:50 ` bugzilla-daemon
2020-02-27 23:00 ` bugzilla-daemon
2020-02-28 0:12 ` bugzilla-daemon
2020-02-28 0:20 ` bugzilla-daemon
2020-02-28 3:38 ` bugzilla-daemon
2020-02-28 3:44 ` bugzilla-daemon
2020-02-28 7:25 ` bugzilla-daemon
2020-02-28 7:26 ` bugzilla-daemon
2020-02-28 7:55 ` bugzilla-daemon
2020-02-28 16:06 ` bugzilla-daemon
2020-02-28 20:14 ` bugzilla-daemon
2020-02-28 21:49 ` bugzilla-daemon
2020-02-29 7:02 ` bugzilla-daemon
2020-02-29 17:40 ` bugzilla-daemon
2020-02-29 19:43 ` bugzilla-daemon
2020-03-01 6:27 ` bugzilla-daemon
2020-03-01 18:21 ` bugzilla-daemon
2020-03-02 7:01 ` bugzilla-daemon
2020-03-03 5:04 ` bugzilla-daemon
2020-03-22 13:43 ` bugzilla-daemon
2020-03-22 18:58 ` bugzilla-daemon
2020-04-03 13:55 ` bugzilla-daemon
2020-04-04 12:57 ` bugzilla-daemon
2020-04-04 13:02 ` bugzilla-daemon
2020-04-04 19:24 ` bugzilla-daemon
2020-04-05 16:52 ` bugzilla-daemon
2020-04-06 2:50 ` bugzilla-daemon
2020-04-06 10:27 ` bugzilla-daemon
2020-04-10 19:28 ` bugzilla-daemon
2020-04-11 0:20 ` bugzilla-daemon
2020-04-13 16:51 ` bugzilla-daemon
2020-04-13 17:20 ` bugzilla-daemon
2020-04-18 22:28 ` bugzilla-daemon
2020-04-18 23:19 ` bugzilla-daemon [this message]
2020-04-22 21:49 ` bugzilla-daemon
2020-04-27 19:11 ` bugzilla-daemon
2020-05-03 19:58 ` bugzilla-daemon
2020-08-24 17:03 ` bugzilla-daemon
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