linux-kernel - Re: [PATCH] PCI: Add link_change error handler and vfio-pci user

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Date:   Mon, 29 Apr 2019 09:45:28 -0700
From:   Sinan Kaya <Okaya@...nel.org>
To:     Alex Williamson <alex.williamson@...hat.com>,
        Bjorn Helgaas <helgaas@...nel.org>
Cc:     mr.nuke.me@...il.com, linux-pci@...r.kernel.org,
        austin_bolen@...l.com, alex_gagniuc@...lteam.com,
        keith.busch@...el.com, Shyam_Iyer@...l.com, lukas@...ner.de,
        torvalds@...ux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] PCI: Add link_change error handler and vfio-pci user

On 4/29/2019 10:51 AM, Alex Williamson wrote:
> So where do we go from here?  I agree that dmesg is not necessarily a
> great choice for these sorts of events and if they went somewhere else,
> maybe I wouldn't have the same concerns about them generating user
> confusion or contributing to DoS vectors from userspace drivers.  As it
> is though, we have known cases where benign events generate confusing
> logging messages, which seems like a regression.  Drivers didn't ask
> for a link_change handler, but nor did they ask that the link state to
> their device be monitored so closely.  Maybe this not only needs some
> sort of change to the logging mechanism, but also an opt-in by the
> driver if they don't expect runtime link changes.  Thanks,

Is there anyway to detect autonomous hardware management support and
not report link state changes in that situation?

I thought there were some capability bits for these.