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

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Date:   Fri, 2 Dec 2016 17:02:59 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
To:     KY Srinivasan <kys@...rosoft.com>
Cc:     "olaf@...fle.de" <olaf@...fle.de>,
        "jasowang@...hat.com" <jasowang@...hat.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "apw@...onical.com" <apw@...onical.com>,
        "devel@...uxdriverproject.org" <devel@...uxdriverproject.org>,
        "leann.ogasawara@...onical.com" <leann.ogasawara@...onical.com>
Subject: Re: [PATCH 02/15] hyperv: Add a function to detect hv_device

On Fri, Dec 02, 2016 at 03:38:51PM +0000, KY Srinivasan wrote:
> 
> 
> > -----Original Message-----
> > From: Greg KH [mailto:gregkh@...uxfoundation.org]
> > Sent: Thursday, December 1, 2016 11:36 PM
> > To: KY Srinivasan <kys@...rosoft.com>
> > Cc: linux-kernel@...r.kernel.org; devel@...uxdriverproject.org;
> > olaf@...fle.de; apw@...onical.com; vkuznets@...hat.com;
> > jasowang@...hat.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...
> Greg,
> 
> This is even worse. On Linux, VF drivers are hypervisor agnostic
> and I want to keep it that way.

Ok, I really don't know what to suggest, other than this is probably not
the way to do this as no other bus has to.  As I don't see the code that
actually uses this anywhere, it's really impossible to have this
conversation at all :(

greg k-h