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[Qemu-discuss] KVM VM is paused. KVM: unknown exit, hardware reason 31

From: Pavel Shirshov
Subject: [Qemu-discuss] KVM VM is paused. KVM: unknown exit, hardware reason 31
Date: Fri, 24 Jul 2015 11:03:38 -0700


I'm running a lot of VMs under qemu (using libvirt and KVM). Sometimes (one time per 2000-3000 runs) I got following:

1. VM is paused by qemu. I can't resume that VM. I can just reset it and resume.
2. In VM log file I see following: "KVM: unknown exit, hardware reason 31" with a CPU dump below.
3. In dmesg I see following:
[84245.284948] EPT: Misconfiguration.
[84245.285056] EPT: GPA: 0xfeda848
[84245.285154] ept_misconfig_inspect_spte: spte 0x5eaef50107 level 4
[84245.285344] ept_misconfig_inspect_spte: spte 0x5f5fadc107 level 3
[84245.285532] ept_misconfig_inspect_spte: spte 0x5141d18107 level 2
[84245.285723] ept_misconfig_inspect_spte: spte 0x52e40dad77 level 1

OS. Linux lab04 3.16.0-44-generic #59~14.04.1-Ubuntu SMP
QEMU: QEMU emulator version 2.0.0 (Debian 2.0.0+dfsg-2ubuntu1.14), Copyright (c) 2003-2008 Fabrice Bellard

Is it a qemu bug, linux kvm bug or CPU bug? How can I fix that?


With best regards, Pavel S. Shirshov

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