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Date: Thu, 12 Jan 2017 23:58:22 -0800
From: Christoph Hellwig <hch@infradead.org>
To: "Michael S. Tsirkin" <mst@redhat.com>
Cc: linux-kernel@vger.kernel.org, Jason Wang <jasowang@redhat.com>,
        virtualization@lists.linux-foundation.org
Subject: Re: [PATCH] virtio_mmio: expose header to userspace
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On Thu, Jan 12, 2017 at 11:37:22PM +0200, Michael S. Tsirkin wrote:
> It's handy for userspace emulators like QEMU.

But it's not actually a userspace API - it's an on the write protocol.

so: NAK.