linux-kernel - Re: [PATCH] nvme: remove multipath module parameter

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Message-ID: <Z8hrJ5JVqi7TgFCn@kbusch-mbp>
Date: Wed, 5 Mar 2025 08:17:59 -0700
From: Keith Busch <kbusch@...nel.org>
To: Christoph Hellwig <hch@....de>
Cc: Hannes Reinecke <hare@...e.de>, Sagi Grimberg <sagi@...mberg.me>,
	Nilay Shroff <nilay@...ux.ibm.com>,
	John Meneghini <jmeneghi@...hat.com>, bmarzins@...hat.com,
	Bryan Gurney <bgurney@...hat.com>, linux-nvme@...ts.infradead.org,
	linux-kernel@...r.kernel.org, Marco Patalano <mpatalan@...hat.com>,
	axboe@...nel.dk
Subject: Re: [PATCH] nvme: remove multipath module parameter

On Wed, Mar 05, 2025 at 03:15:54PM +0100, Christoph Hellwig wrote:
> On Wed, Feb 26, 2025 at 10:55:21AM +0100, Hannes Reinecke wrote:
> > Plus there are some NVMe devices out there which _despite_ being PCIe do 
> > report NMIC and CMIC set (I won't name names, if you came across them 
> > you'll know)
> 
> ?????
> 
> NMIC and CMIC is perfectly normal and expected for multiported PCIe.
> WTF are you talking about?

Obviously he's not talking about multiported PCIe. And he's right, the
behavior of a PCIe hot plug is very different and often undesirable when
it's under native multipath.