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From: KY Srinivasan <kys@microsoft.com>
To: Stephen Hemminger <stephen@networkplumber.org>,
	Christoph Hellwig <hch@infradead.org>
Cc: "Paolo Bonzini" <pbonzini@redhat.com>,
	"Roman Kagan" <rkagan@virtuozzo.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, 21 Dec 2016 19:54:11 +0000	[thread overview]
Message-ID: <DM5PR03MB2490AAE96B779C49A777FD15A0930@DM5PR03MB2490.namprd03.prod.outlook.com> (raw)
In-Reply-To: <20161221100247.69a4049b@xeon-e3>



> -----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.

Regards,

K. Y

  reply	other threads:[~2016-12-21 20:09 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 [this message]
2016-12-28 17:09                         ` Roman Kagan
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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