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From: Roman Kagan <rkagan@virtuozzo.com>
To: KY Srinivasan <kys@microsoft.com>
Cc: "Stephen Hemminger" <stephen@networkplumber.org>,
	"Christoph Hellwig" <hch@infradead.org>,
	"Paolo Bonzini" <pbonzini@redhat.com>,
	"Radim Krčmář" <rkrcmar@redhat.com>,
	"Vitaly Kuznetsov" <vkuznets@redhat.com>,
	"kvm@vger.kernel.org" <kvm@vger.kernel.org>,
	"Denis V . Lunev" <den@openvz.org>,
	"Haiyang Zhang" <haiyangz@microsoft.com>,
	"x86@kernel.org" <x86@kernel.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"Ingo Molnar" <mingo@redhat.com>,
	"H. Peter Anvin" <hpa@zytor.com>,
	"devel@linuxdriverproject.org" <devel@linuxdriverproject.org>,
	"Thomas Gleixner" <tglx@linutronix.de>
Subject: Re: [PATCH 12/15] hyperv: move VMBus connection ids to uapi
Date: Wed, 28 Dec 2016 20:09:44 +0300	[thread overview]
Message-ID: <20161228170943.GB14702@rkaganb.sw.ru> (raw)
In-Reply-To: <DM5PR03MB2490AAE96B779C49A777FD15A0930@DM5PR03MB2490.namprd03.prod.outlook.com>

On Wed, Dec 21, 2016 at 07:54:11PM +0000, KY Srinivasan wrote:
> 
> 
> > -----Original Message-----
> > From: Stephen Hemminger [mailto:stephen@networkplumber.org]
> > Sent: Wednesday, December 21, 2016 10:03 AM
> > To: Christoph Hellwig <hch@infradead.org>
> > Cc: Paolo Bonzini <pbonzini@redhat.com>; Roman Kagan
> > <rkagan@virtuozzo.com>; Radim Krčmář <rkrcmar@redhat.com>; KY
> > Srinivasan <kys@microsoft.com>; Vitaly Kuznetsov
> > <vkuznets@redhat.com>; kvm@vger.kernel.org; Denis V . Lunev
> > <den@openvz.org>; Haiyang Zhang <haiyangz@microsoft.com>;
> > x86@kernel.org; linux-kernel@vger.kernel.org; Ingo Molnar
> > <mingo@redhat.com>; H. Peter Anvin <hpa@zytor.com>;
> > devel@linuxdriverproject.org; Thomas Gleixner <tglx@linutronix.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@infradead.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.

  reply	other threads:[~2016-12-28 17:25 UTC|newest]

Thread overview: 54+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-12-20 15:55 [PATCH 00/15] hyperv: more stuff to uapi + cleanup Roman Kagan
2016-12-20 15:55 ` [PATCH 01/15] hyperv: consolidate TSC ref page definitions Roman Kagan
2016-12-20 20:57   ` KY Srinivasan
2016-12-21  6:25     ` Roman Kagan
2016-12-20 15:55 ` [PATCH 02/15] hyperv: uapi-fy synic event flags definitions Roman Kagan
2016-12-20 17:24   ` Stephen Hemminger
2016-12-21  6:33     ` Roman Kagan
2016-12-21 10:58   ` kbuild test robot
2016-12-21 18:58   ` KY Srinivasan
2016-12-20 15:55 ` [PATCH 03/15] hyperv: use standard bitops Roman Kagan
2016-12-21 12:00   ` Olaf Hering
2016-12-21 13:23     ` Roman Kagan
2016-12-22 12:33       ` Paolo Bonzini
2016-12-21 19:08   ` KY Srinivasan
2016-12-20 15:55 ` [PATCH 04/15] hyperv: define VMBus message type Roman Kagan
2016-12-20 15:55 ` [PATCH 05/15] hyperv: GFP_ATOMIC -> GFP_KERNEL Roman Kagan
2016-12-20 15:55 ` [PATCH 06/15] hyperv: avoid unnecessary vmalloc Roman Kagan
2016-12-21 19:19   ` KY Srinivasan
2016-12-20 15:55 ` [PATCH 07/15] hyperv: dedup cpuid definitions Roman Kagan
2016-12-20 15:55 ` [PATCH 08/15] hyperv: dedup crash msr related definitions Roman Kagan
2016-12-20 15:55 ` [PATCH 09/15] hyperv: unify Hyper-V msr definitions Roman Kagan
2016-12-20 15:55 ` [PATCH 10/15] hyperv: uapi-fy PostMessage and SignalEvent hypercall structures Roman Kagan
2016-12-21 19:27   ` KY Srinivasan
2016-12-20 15:55 ` [PATCH 11/15] hyperv: uapi-fy monitored notification structures Roman Kagan
2016-12-20 15:55 ` [PATCH 12/15] hyperv: move VMBus connection ids to uapi Roman Kagan
2016-12-20 17:25   ` Stephen Hemminger
2016-12-21  6:29     ` Roman Kagan
2016-12-21 12:18       ` Christoph Hellwig
2016-12-21 12:59         ` Roman Kagan
2016-12-21 14:26           ` Christoph Hellwig
2016-12-21 14:39             ` Roman Kagan
2016-12-21 15:39             ` Paolo Bonzini
2016-12-21 15:43               ` Christoph Hellwig
2016-12-21 17:25                 ` Paolo Bonzini
2016-12-21 17:50                 ` Stephen Hemminger
2016-12-21 17:53                   ` Paolo Bonzini
2016-12-21 17:58                   ` Christoph Hellwig
2016-12-21 18:02                     ` Stephen Hemminger
2016-12-21 19:54                       ` KY Srinivasan
2016-12-28 17:09                         ` Roman Kagan [this message]
2016-12-29 18:29                           ` Stephen Hemminger
2017-01-02  8:19                           ` Paolo Bonzini
2017-01-09  8:32                             ` Roman Kagan
2017-01-09  8:40                               ` hpa
2017-01-09  8:58                                 ` Roman Kagan
2017-01-09  9:02                                 ` Paolo Bonzini
2017-01-02 19:39                           ` Stephen Hemminger
2017-01-03  9:32                             ` Paolo Bonzini
2016-12-20 15:56 ` [PATCH 13/15] hyperv: move function close to its only callsite Roman Kagan
2016-12-20 15:56 ` [PATCH 14/15] hyperv_vmbus: drop unused definitions Roman Kagan
2016-12-20 15:56 ` [PATCH 15/15] hyperv: redefine hv_message without bitfields Roman Kagan
2016-12-21 18:00 ` [PATCH 00/15] hyperv: more stuff to uapi + cleanup KY Srinivasan
2016-12-28 16:57   ` Roman Kagan
2016-12-30 19:45     ` KY Srinivasan

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