linux-kernel - Re: [PATCH 1/2] PCI: Allow drivers to request exclusive config regions

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Message-ID: <6303f298ef92c_1b322944c@dwillia2-xfh.jf.intel.com.notmuch>
Date:   Mon, 22 Aug 2022 14:18:17 -0700
From:   Dan Williams <dan.j.williams@...el.com>
To:     Ira Weiny <ira.weiny@...el.com>,
        Dan Williams <dan.j.williams@...el.com>
CC:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>,
        Alison Schofield <alison.schofield@...el.com>,
        Vishal Verma <vishal.l.verma@...el.com>,
        Ben Widawsky <bwidawsk@...nel.org>,
        <linux-cxl@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-pci@...r.kernel.org>
Subject: Re: [PATCH 1/2] PCI: Allow drivers to request exclusive config
 regions

Ira Weiny wrote:
> > Similar to CONFIG_IO_STRICT_DEVMEM, just turn this warning off if you
> > are a distribution kernel vendor who does not care about DOE vendor
> > tools affecting system state, and turn on CONFIG_LOCK_DOWN_KERNEL if you
> > are on the other end of the spectrum and want protection from such
> > things. The warn is middle-road option that I expect most distros would
> > use.
> 
> FWIW I did not add any Kconfig for the feature.  Should I?

I think so, especially as it is a distro configuration policy about what
user-mode PCI tooling it wants to support / warn about.