linux-kernel - Re: [PATCH] PCI: vmd: Expose oob management window to users

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Date:   Tue, 17 Sep 2019 01:04:35 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Jon Derrick <jonathan.derrick@...el.com>
Cc:     Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Bjorn Helgaas <helgaas@...nel.org>,
        Keith Busch <keith.busch@...el.com>, linux-pci@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] PCI: vmd: Expose oob management window to users

On Mon, Sep 16, 2019 at 08:51:28AM -0600, Jon Derrick wrote:
> Some VMD devices provide a management window within MEMBAR2 that is used
> to communicate out-of-band with child devices. This patch creates a
> binary file for interacting with the interface.
> 
> OOB Reads/Writes are bounds-checked by sysfs_fs_bin_{read,write}

I don't think this is a reasonable interface.  If the OOB interfae
is useful please provide an actual kernel driver for it.