linux-kernel - Re: [PATCH v2] s390/virtio: mark headers as BSD licensed

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Date:   Wed, 8 Nov 2017 21:35:48 +0200
From:   "Michael S. Tsirkin" <mst@...hat.com>
To:     Christian Borntraeger <borntraeger@...ibm.com>
Cc:     Cornelia Huck <cohuck@...hat.com>, linux-kernel@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Martin Schwidefsky <schwidefsky@...ibm.com>,
        Heiko Carstens <heiko.carstens@...ibm.com>,
        linux-s390@...r.kernel.org
Subject: Re: [PATCH v2] s390/virtio: mark headers as BSD licensed

On Wed, Nov 08, 2017 at 07:57:28PM +0100, Christian Borntraeger wrote:
> So what about the following
> 
> - leave kvm_virtio.h unchanged and we will delete this file via the s390 tree

Seems to be used by kvm_virtio.c - are you removing that too?

> - change virtio_ccw.h to BSD license. The content of this file is really really trivial
> and it boils down to 2 defines, that can be easily reconstructed by looking at the virtio spec.
> Not even sure if something like this can be copyrighted.

Yes. What prompted this was Greg's patch.

> 
> For reference the content of this file minus comments is
> 
> - snip -
> #define KVM_VIRTIO_CCW_RING_ALIGN 4096
> #define KVM_S390_VIRTIO_CCW_NOTIFY 3
> - snip -
> 
> 
> On 11/08/2017 07:33 PM, Christian Borntraeger wrote:
> > 
> > 
> > On 11/08/2017 07:15 PM, Cornelia Huck wrote:
> >> On Wed, 8 Nov 2017 19:12:25 +0100his
> >> Christian Borntraeger <borntraeger@...ibm.com> wrote:
> >>
> >>> On 11/08/2017 05:59 PM, Michael S. Tsirkin wrote:
> >>>> Virtio UAPI headers aren't just for UAPI, it's for guests/hypervisors as
> >>>> well.  The s390 ones need to be BSD as well.
> >>>>
> >>>> Fixes: e2be04c7f995 ("License cleanup: add SPDX license identifier to uapi header files with a license")
> >>>> Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> >>>> Signed-off-by: Michael S. Tsirkin <mst@...hat.com>
> >>>> ---
> >>>>
> >>>> since v1:
> >>>> 	drop an extra comment chunk, reported by Cornelia
> >>>>
> >>>>  arch/s390/include/uapi/asm/kvm_virtio.h | 26 +++++++++++++++++++++++++-  
> >>>
> >>> FWIW, this file will go away anyway. 
> >>> Looks like the following commit in the s390 feature branch 
> >>> https://git.kernel.org/pub/scm/linux/kernel/git/s390/linux.git/commit/drivers/s390/virtio/Makefile?h=features&id=7fb2b2d512448cf0e914c4647a1cf02b52263702
> >>> missed this file.
> >>
> >> Can we simply rip this out?
> >>
> >>>
> >>>
> >>> Regarding the virtio-ccw.h headers it is probably something that happened by accident.
> >>> Back then Rusty (as an IBMer) proposed to change all virtio headers to BSD licence.
> >>
> >> ISTR that the relicensing already went through... is that not the case?
> > 
> > The original kvm_virtio.h code was added in 2008
> > 
> > commit e976a2b997fc4ad70ccc53acfe62811c4aaec851
> > Author: Christian Borntraeger <borntraeger@...ibm.com>
> > Date:   Tue Mar 25 18:47:46 2008 +0100
> > 
> >     s390: KVM guest: virtio device support, and kvm hypercalls
> > 
> > 
> > 
> > 
> > The BSD re-licencing happened in 2008
> > 
> > commit 674bfc23c585b34c42263d73fb51710d49762a23
> > Author: Rusty Russell <rusty@...tcorp.com.au>
> > Date:   Fri Jul 25 12:06:03 2008 -0500
> > 
> >     virtio: clarify that ABI is usable by any implementations
> >     
> >     We want others to implement and use virtio, so it makes sense to BSD
> >     license the non-__KERNEL__ parts of the headers to make this crystal
> >     clear.
> > 
> > and it seems that it missed arch/include/uapi/asm/kvm_virtio.h
> > 
> > 
> > 
> > arch/include/uapi/asm/virtio_ccw.h probably just copied what
> > kvm_virtio.h had in 2013.
> > 
> > So its somewhat fair to assume that both files should be BSD, but they are not
> > according to the licence statement.
> > 
> > Gregs SPDX change just changed the GPL text in the header files to a SPDX
> > statement. Now Michael wants to change this to BSD as it probably was intended
> > but not written down. Sigh.
> > 
> >> I thought this was just a fixup to align with reality?
> >>
> >>>
> >>>>  arch/s390/include/uapi/asm/virtio-ccw.h | 26 +++++++++++++++++++++++++-
> >>>>  2 files changed, 50 insertions(+), 2 deletions(-)
> >>