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From: Derek Yerger <derek@djy.llc>
To: kvm@vger.kernel.org
Subject: PROBLEM: Regression of MMU causing guest VM application errors
Date: Wed, 16 Oct 2019 00:49:51 -0400	[thread overview]
Message-ID: <1e525b08-6204-3238-5d56-513f82f1d7fb@djy.llc> (raw)

In at least Linux 5.2.7 via Fedora, up to 5.2.18, guest OS applications 
repeatedly crash with segfaults. The problem does not occur on 5.1.16.

System is running Fedora 29 with kernel 5.2.18. Guest OS is Windows 10 with an 
AMD Radeon 540 GPU passthrough. When on 5.2.7 or 5.2.18, specific windows 
applications frequently and repeatedly crash, throwing exceptions in random 
libraries. Going back to 5.1.16, the issue does not occur.

The host system is unaffected by the regression.

Keywords: kvm mmu pci passthrough vfio vfio-pci amdgpu

Possibly related: Unmerged [PATCH] KVM: x86/MMU: Zap all when removing memslot 
if VM has assigned device

Workaround: Use 5.1.16 kernel.

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-- 
Derek Yerger


             reply	other threads:[~2019-10-16  4:49 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-10-16  4:49 Derek Yerger [this message]
2019-10-16  7:28 ` PROBLEM: Regression of MMU causing guest VM application errors Paolo Bonzini
2019-10-16 17:28 ` Alex Williamson
2019-10-16 17:49   ` Sean Christopherson
2019-10-17 23:57     ` Derek Yerger
2019-10-22 20:28       ` Sean Christopherson
2019-10-24 15:18         ` Derek Yerger
2019-10-24 17:32           ` Sean Christopherson
2019-10-31  3:44             ` Derek Yerger
2019-11-19 20:01               ` Sean Christopherson
2019-11-20  9:19                 ` Wanpeng Li
2019-11-20  9:57                   ` Paolo Bonzini
2019-11-20 18:19                 ` Sean Christopherson
2019-11-20 19:04                   ` Derek Yerger
2019-11-20 19:28                     ` Sean Christopherson
2019-11-27 15:24                       ` Sean Christopherson
2019-12-17 23:11                         ` Sean Christopherson
2019-12-17 23:13                           ` Derek Yerger
2020-01-02 13:42                           ` Derek Yerger

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