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

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Message-ID: <20161228170943.GB14702@rkaganb.sw.ru>
Date:   Wed, 28 Dec 2016 20:09:44 +0300
From:   Roman Kagan <rkagan@...tuozzo.com>
To:     KY Srinivasan <kys@...rosoft.com>
CC:     Stephen Hemminger <stephen@...workplumber.org>,
        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, 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.