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Date: Tue, 4 May 2021 15:00:39 +0200
From: Christoph Hellwig <hch@lst.de>
To: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Subject: Re: remove the nvlink2 pci_vfio subdriver v2
Message-ID: <20210504130039.GA7711@lst.de>
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Cc: qemu-devel@nongnu.org, Daniel Vetter <daniel@ffwll.ch>, kvm@vger.kernel.org,
 David Airlie <airlied@linux.ie>, Greg Kurz <groug@kaod.org>,
 dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org,
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 Christoph Hellwig <hch@lst.de>
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 <linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org>

On Tue, May 04, 2021 at 02:59:07PM +0200, Greg Kroah-Hartman wrote:
> > Hi Christoph,
> > 
> > FYI, these uapi changes break build of QEMU.
> 
> What uapi changes?
> 
> What exactly breaks?
> 
> Why does QEMU require kernel driver stuff?

Looks like it pull in the uapi struct definitions unconditionally
instead of having a local copy.  We could fix that by just putting
them back, but to me this seems like a rather broken configuration
in qemu when it pulls in headers from the running/installed kernel
without any feature checks before using them.