linux-kernel - Re: [pci PATCH v5 3/4] ena: Migrate over to unmanaged SR-IOV support

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Message-ID: <20180313081628.GA618@lst.de>
Date:   Tue, 13 Mar 2018 09:16:28 +0100
From:   Christoph Hellwig <hch@....de>
To:     David Woodhouse <dwmw2@...radead.org>
Cc:     Alexander Duyck <alexander.duyck@...il.com>, bhelgaas@...gle.com,
        alexander.h.duyck@...el.com, linux-pci@...r.kernel.org,
        virtio-dev@...ts.oasis-open.org, kvm@...r.kernel.org,
        netdev@...r.kernel.org, dan.daly@...el.com,
        linux-kernel@...r.kernel.org, linux-nvme@...ts.infradead.org,
        keith.busch@...el.com, netanel@...zon.com, mheyne@...zon.de,
        liang-min.wang@...el.com, mark.d.rustad@...el.com, hch@....de
Subject: Re: [pci PATCH v5 3/4] ena: Migrate over to unmanaged SR-IOV
        support

On Tue, Mar 13, 2018 at 08:12:52AM +0000, David Woodhouse wrote:
> I'd also *really* like to see a way to enable this for PFs which don't
> have (and don't need) a driver. We seem to have lost that along the
> way.

We've been forth and back on that.  I agree that not having any driver
just seems dangerous.  If your PF really does nothing we should just
have a trivial pf_stub driver that does nothing but wiring up
pci_sriov_configure_simple.  We can then add PCI IDs to it either
statically, or using the dynamic ids mechanism.