linux-kernel - Re: [PATCH] PCI: Fix crash during pci_dev hot-unplug on pseries KVM guest

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Message-ID: <qcidmczsjdhaqz7hy3cqnpkjiaulxi7277ayzly3zyrrdbcr4w@5s4x5cgd3xk2>
Date: Thu, 11 Jul 2024 19:51:06 +0530
From: Amit Machhiwal <amachhiw@...ux.ibm.com>
To: Rob Herring <robh@...nel.org>
Cc: linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org, kvm-ppc@...r.kernel.org,
        Bjorn Helgaas <bhelgaas@...gle.com>, Lizhi Hou <lizhi.hou@....com>,
        Vaibhav Jain <vaibhav@...ux.ibm.com>,
        Nicholas Piggin <npiggin@...il.com>,
        Michael Ellerman <mpe@...erman.id.au>,
        Vaidyanathan Srinivasan <svaidy@...ux.ibm.com>,
        Kowshik Jois B S <kowsjois@...ux.ibm.com>
Subject: Re: [PATCH] PCI: Fix crash during pci_dev hot-unplug on pseries KVM
 guest

Hi Rob,

On 2024/07/11 06:20 AM, Rob Herring wrote:
> On Wed, Jul 3, 2024 at 8:17 AM Amit Machhiwal <amachhiw@...ux.ibm.com> wrote:
> >
> > With CONFIG_PCI_DYNAMIC_OF_NODES [1], a hot-plug and hot-unplug sequence
> > of a PCI device attached to a PCI-bridge causes following kernel Oops on
> > a pseries KVM guest:
> 
> Can I ask why you have this option on in the first place? Do you have
> a use for it or it's just a case of distros turn on every kconfig
> option.

Yes, this option is turned on in Ubuntu's distro kernel config where the issue
was originally reported, while Fedora is keeping this turned off.

    root@...ntu:~# cat /boot/config-6.8.0-38-generic | grep PCI_DYN
    CONFIG_PCI_DYNAMIC_OF_NODES=y

    root@...ora:~# cat /boot/config-6.9.7-200.fc40.ppc64le | grep PCI_DYN
    # CONFIG_PCI_DYNAMIC_OF_NODES is not set

Thanks,
Amit

> 
> Rob