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Date:   Tue, 7 Jan 2020 05:27:51 -0800
From:   Christoph Hellwig <hch@infradead.org>
To:     Lu Baolu <baolu.lu@linux.intel.com>
Cc:     Joerg Roedel <joro@8bytes.org>, iommu@lists.linux-foundation.org,
        linux-kernel@vger.kernel.org,
        Roland Dreier <roland@purestorage.com>,
        Jim Yan <jimyan@baidu.com>
Subject: Re: [PATCH 1/1] iommu/vt-d: Add a quirk flag for scope mismatched
 devices
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WTF is a NVMe host supposed to mean for a PCIe device.  NVMe defines
the host as following:

"1.6.16 host

An entity that interfaces to an NVM subsystem through one or more
controllers and submits commands to Submission Queues and retrieves
command completions from Completion Queues."

in other words - the Linux kernel is the NVMe host.  You need to
describe this magic broken piece of crap a lot better than that.