linux-kernel - Re: remove the nvlink2 pci

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Message-ID: <20210504130039.GA7711@lst.de>
Date:   Tue, 4 May 2021 15:00:39 +0200
From:   Christoph Hellwig <hch@....de>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Greg Kurz <groug@...d.org>, Christoph Hellwig <hch@....de>,
        Michael Ellerman <mpe@...erman.id.au>,
        Alex Williamson <alex.williamson@...hat.com>,
        Jason Gunthorpe <jgg@...dia.com>, kvm@...r.kernel.org,
        David Airlie <airlied@...ux.ie>, linux-kernel@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, Paul Mackerras <paulus@...ba.org>,
        Daniel Vetter <daniel@...ll.ch>, linux-api@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org, qemu-devel@...gnu.org,
        qemu-ppc@...gnu.org
Subject: Re: remove the nvlink2 pci_vfio subdriver v2

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.