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

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Message-ID: <20161221121858.GA17429@infradead.org>
Date:   Wed, 21 Dec 2016 04:18:58 -0800
From:   Christoph Hellwig <hch@...radead.org>
To:     Roman Kagan <rkagan@...tuozzo.com>,
        Stephen Hemminger <stephen@...workplumber.org>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Radim Krčmář <rkrcmar@...hat.com>,
        "K. Y. 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, 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.