From mboxrd@z Thu Jan  1 00:00:00 1970
From: Christoph Hellwig <hch@infradead.org>
Subject: Re: [PATCH 12/15] hyperv: move VMBus connection ids to uapi
Date: Wed, 21 Dec 2016 04:18:58 -0800
Message-ID: <20161221121858.GA17429@infradead.org>
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 <20161220155602.6298-13-rkagan@virtuozzo.com>
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To: Roman Kagan <rkagan@virtuozzo.com>,
        Stephen Hemminger <stephen@networkplumber.org>,
        Paolo Bonzini <pbonzini@redhat.com>,
        Radim =?utf-8?B?S3LEjW3DocWZ?= <rkrcmar@redhat.com>,
        "K. Y. 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>
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On Wed, Dec 21, 2016 at 09:29:39AM +0300, Roman Kagan wrote:
> QEMU in particular.  We're planning to implement VMBus devices in QEMU
> and would like to have the definitions shared with the Linux guest
> drivers for Hyper-V.

And that's everything but a userspace API.  The way to go for protocol
constants is to have a normal kernel header that is not exported, and
a copy of it wherever else you need it.