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Date:   Tue, 20 Jul 2021 07:01:24 +0100
From:   Christoph Hellwig <hch@infradead.org>
To:     Bart Van Assche <bvanassche@acm.org>
Cc:     longli@linuxonhyperv.com, linux-fs@vger.kernel.org,
        linux-block@vger.kernel.org, linux-kernel@vger.kernel.org,
        linux-hyperv@vger.kernel.org, Long Li <longli@microsoft.com>
Subject: Re: [Patch v4 0/3] Introduce a driver to support host accelerated
 access to Microsoft Azure Blob
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 <82e8bec6-4f6f-08d7-90db-9661f675749d@acm.org>
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On Mon, Jul 19, 2021 at 09:37:56PM -0700, Bart Van Assche wrote:
> such that this object storage driver can be implemented as a user-space
> library instead of as a kernel driver? As you may know vfio users can
> either use eventfds for completion notifications or polling. An
> interface like io_uring can be built easily on top of vfio.

Yes.  Similar to say the NVMe K/V command set this does not look like
a candidate for a kernel driver.