linux-kernel - Re: [PATCH v3 00/15] honor isolcpus configuration

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Message-ID: <CAJSP0QVod5DA2hdNFrpN+HZcfm6Bg11teRmt5d+MBTB1wH4vZg@mail.gmail.com>
Date: Tue, 6 Aug 2024 09:09:50 -0400
From: Stefan Hajnoczi <stefanha@...il.com>
To: Daniel Wagner <dwagner@...e.de>
Cc: Jens Axboe <axboe@...nel.dk>, Keith Busch <kbusch@...nel.org>, Sagi Grimberg <sagi@...mberg.me>, 
	Thomas Gleixner <tglx@...utronix.de>, Christoph Hellwig <hch@....de>, 
	"Martin K. Petersen" <martin.petersen@...cle.com>, John Garry <john.g.garry@...cle.com>, 
	"Michael S. Tsirkin" <mst@...hat.com>, Jason Wang <jasowang@...hat.com>, 
	Kashyap Desai <kashyap.desai@...adcom.com>, Sumit Saxena <sumit.saxena@...adcom.com>, 
	Shivasharan S <shivasharan.srikanteshwara@...adcom.com>, 
	Chandrakanth patil <chandrakanth.patil@...adcom.com>, 
	Sathya Prakash Veerichetty <sathya.prakash@...adcom.com>, 
	Suganath Prabu Subramani <suganath-prabu.subramani@...adcom.com>, Nilesh Javali <njavali@...vell.com>, 
	GR-QLogic-Storage-Upstream@...vell.com, Jonathan Corbet <corbet@....net>, 
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	Ming Lei <ming.lei@...hat.com>, linux-kernel@...r.kernel.org, 
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	linux-doc@...r.kernel.org
Subject: Re: [PATCH v3 00/15] honor isolcpus configuration

On Tue, 6 Aug 2024 at 08:10, Daniel Wagner <dwagner@...e.de> wrote:
> The only stall I was able to trigger
> reliable was with qemu's PCI emulation. It looks like when a CPU is
> offlined, the PCI affinity is reprogrammed but qemu still routes IRQs to
> an offline CPU instead to newly programmed destination CPU. All worked
> fine on real hardware.

Hi Daniel,
Please file a QEMU bug report here (or just reply to this emails with
details on how to reproduce the issue and I'll file the issue on your
behalf):
https://gitlab.com/qemu-project/qemu/-/issues

We can also wait until your Linux patches have landed if that makes it
easier to reproduce the bug.

Thanks!

Stefan