linux-kernel - Re: [PATCH 12/15] hyperv: move VMBus connection ids to uapi

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Date:   Mon, 2 Jan 2017 11:39:16 -0800
From:   Stephen Hemminger <stephen@...workplumber.org>
To:     Roman Kagan <rkagan@...tuozzo.com>
Cc:     KY Srinivasan <kys@...rosoft.com>,
        Christoph Hellwig <hch@...radead.org>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Radim Krčmář <rkrcmar@...hat.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "Denis V . Lunev" <den@...nvz.org>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        "x86@...nel.org" <x86@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        "devel@...uxdriverproject.org" <devel@...uxdriverproject.org>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH 12/15] hyperv: move VMBus connection ids to uapi

On Wed, 28 Dec 2016 20:09:44 +0300
Roman Kagan <rkagan@...tuozzo.com> wrote:

> On Wed, Dec 21, 2016 at 07:54:11PM +0000, KY Srinivasan wrote:
> > 
> >   
> > > -----Original Message-----
> > > From: Stephen Hemminger [mailto:stephen@...workplumber.org]
> > > Sent: Wednesday, December 21, 2016 10:03 AM
> > > To: Christoph Hellwig <hch@...radead.org>
> > > Cc: Paolo Bonzini <pbonzini@...hat.com>; Roman Kagan
> > > <rkagan@...tuozzo.com>; Radim Krčmář <rkrcmar@...hat.com>; KY
> > > Srinivasan <kys@...rosoft.com>; Vitaly Kuznetsov
> > > <vkuznets@...hat.com>; kvm@...r.kernel.org; Denis V . Lunev
> > > <den@...nvz.org>; Haiyang Zhang <haiyangz@...rosoft.com>;
> > > x86@...nel.org; linux-kernel@...r.kernel.org; Ingo Molnar
> > > <mingo@...hat.com>; H. Peter Anvin <hpa@...or.com>;
> > > devel@...uxdriverproject.org; Thomas Gleixner <tglx@...utronix.de>
> > > Subject: Re: [PATCH 12/15] hyperv: move VMBus connection ids to uapi
> > > 
> > > On Wed, 21 Dec 2016 09:58:36 -0800
> > > Christoph Hellwig <hch@...radead.org> wrote:
> > >   
> > > > On Wed, Dec 21, 2016 at 09:50:49AM -0800, Stephen Hemminger wrote:  
> > > > > Lastly, there is licensing issues on headers. It would be good to have any
> > > > > userspace ABI headers licensed with a more liberal license so that BSD  
> > > and DPDK drivers  
> > > > > could use them directly. Right now each one reinvents.  
> > > >
> > > > Microsoft could easily solves this problem by offering a suitably
> > > > liberally licensed header documenting the full HyperV guest protocol
> > > > that Linux and other projects could use.  
> > > 
> > > The issue is if same header file mixes kernel and userspace API stuff.
> > > 
> > > Once the files are arranged right, I will submit trivial change to comments
> > > to indicate the liberal licensing of userspace API headers.  
> > 
> > Let us take this one step at a time. I know for a fact that not all the guest host
> > protocols on Hyper-V are guaranteed to be stable. Some of the protocols are part of
> > the published MSFT standards such RNDIS and these obviously are guaranteed to be
> > stable. For the rest it is less clear. The fact that we need to ensure compatibility of existing
> > Windows guests tells me that any host side changes will be versioned and the hosts will always
> > support older guests.
> > 
> > I would like to minimize what we include in the uapi header; especially when MSFT has made no guarantees
> > with regards how  they may be evolved. I will also work on getting some clarity on both stability and
> > under what license we would expose the uapi header.  
> 
> Am I correct assuming that QEMU is currently the only user of
> arch/x86/include/uapi/asm/hyperv.h?
> 
> Then I think we're fine withdrawing it from uapi as a whole and letting
> QEMU pull it in through its header-harvesting scripts (as does now
> anyway).  This would lift all licensing and longterm API stability
> expectations.
> 
> Roman.

Thanks, that prevents lots of problems.
That is how I handle iproute2 as well.