linux-kernel - Re: [PATCH v3] PCI: Fix crash during pci

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Message-ID: <20240813164329.GA1180569-robh@kernel.org>
Date: Tue, 13 Aug 2024 10:43:29 -0600
From: Rob Herring <robh@...nel.org>
To: Bjorn Helgaas <helgaas@...nel.org>
Cc: Amit Machhiwal <amachhiw@...ux.ibm.com>, linux-pci@...r.kernel.org,
	linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
	linuxppc-dev@...ts.ozlabs.org, kvm-ppc@...r.kernel.org,
	Bjorn Helgaas <bhelgaas@...gle.com>, Lizhi Hou <lizhi.hou@....com>,
	Saravana Kannan <saravanak@...gle.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>,
	Lukas Wunner <lukas@...ner.de>, kernel-team@...ts.ubuntu.com,
	Stefan Bader <stefan.bader@...onical.com>
Subject: Re: [PATCH v3] PCI: Fix crash during pci_dev hot-unplug on pseries
 KVM guest

On Tue, Aug 06, 2024 at 03:00:59PM -0500, Bjorn Helgaas wrote:
> On Sat, Aug 03, 2024 at 12:03:25AM +0530, Amit Machhiwal 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:
> 
> What is unique about pseries here?  There's nothing specific to
> pseries in the patch, so I would expect this to be a generic problem
> on any arch.

Only pseries does PCI hotplug with DT I think. It would happen if 
another system did though, but I think documenting the exact system is 
good. No reason we can't do both though.

Rob