linux-kernel - Re: [PATCH 02/15] hyperv: Add a function to detect hv

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Date:   Fri, 2 Dec 2016 08:36:14 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
To:     KY Srinivasan <kys@...rosoft.com>
Cc:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "devel@...uxdriverproject.org" <devel@...uxdriverproject.org>,
        "olaf@...fle.de" <olaf@...fle.de>,
        "apw@...onical.com" <apw@...onical.com>,
        "vkuznets@...hat.com" <vkuznets@...hat.com>,
        "jasowang@...hat.com" <jasowang@...hat.com>,
        "leann.ogasawara@...onical.com" <leann.ogasawara@...onical.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>
Subject: Re: [PATCH 02/15] hyperv: Add a function to detect hv_device

On Fri, Dec 02, 2016 at 07:14:03AM +0000, KY Srinivasan wrote:
> > In other words, why do you need this and PCI or USB doesn't?  Why is
> > hyperv "special"?
> 
> On Hyper-V, each VF interface (SR-IOV interface)
> is paired with an instance of the 
> synthetic interface that is managed by netvsc.
> When the VF interface comes up, we
> need to associate the VF instance with 
> the corresponding netvsc instance. To do this
> without modifying the VF drivers, netvsc registers 
> for netdev events.

Why not modify the VF drivers?  You have the full source to them...