linux-kernel - Re: [PATCH] uio/uio_pci_generic: Add SR-IOV support

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Message-ID: <1506550852.7476.33.camel@infradead.org>
Date:   Wed, 27 Sep 2017 23:20:52 +0100
From:   David Woodhouse <dwmw2@...radead.org>
To:     Bjorn Helgaas <helgaas@...nel.org>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-pci <linux-pci@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Donald Dutile <ddutile@...hat.com>,
        Alexander Duyck <alexander.h.duyck@...el.com>,
        "Bryant G. Ly" <bryantly@...ux.vnet.ibm.com>,
        Bodong Wang <bodong@...lanox.com>,
        Alex Williamson <alex.williamson@...hat.com>,
        "Michael S. Tsirkin" <mst@...hat.com>, kvm@...r.kernel.org
Subject: Re: [PATCH] uio/uio_pci_generic: Add SR-IOV support

On Wed, 2017-09-27 at 17:00 -0500, Bjorn Helgaas wrote:
> 
> 
> IIUC, this question is basically "why doesn't the PCI core enable IOV
> automatically when it sees an IOV-capable device?"
> 
> I think one reason is that an admin might want to control the number
> of VFs we enable (e.g., via 1789382a72a5 ("PCI: SRIOV control and
> status via sysfs" [1]).  But I guess you already know about that,
> since this patch uses that sysfs path, so maybe I don't understand
> your question.


I mean, why doesn't the PCI core *allow* SR-IOV to be enabled via
sysfs, unless the driver does this?
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