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From: Paolo Bonzini <pbonzini@redhat.com>
To: Derek Yerger <derek@djy.llc>, kvm@vger.kernel.org
Subject: Re: PROBLEM: Regression of MMU causing guest VM application errors
Date: Wed, 16 Oct 2019 09:28:16 +0200	[thread overview]
Message-ID: <ae30e8c8-5893-5249-4c40-0278bb93a0a6@redhat.com> (raw)
In-Reply-To: <1e525b08-6204-3238-5d56-513f82f1d7fb@djy.llc>

On 16/10/19 06:49, Derek Yerger wrote:
> 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.

This should have been fixed in 5.2.16 through the following patches:

- "[x86] Revert "KVM: x86/mmu: Zap only the relevant pages when removing
a memslot" (5.2.11)

- "KVM: x86/mmu: Reintroduce fast invalidate/zap for flushing memslot"
(5.2.16).

Paolo


  reply	other threads:[~2019-10-16  7:28 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-10-16  4:49 PROBLEM: Regression of MMU causing guest VM application errors Derek Yerger
2019-10-16  7:28 ` Paolo Bonzini [this message]
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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