Re: [Xen-devel] [Qemu-block] [PATCH 02/18] xen: introduce new 'XenBus' and 'XenDevice' object hierarchy

[Paul Durrant <Paul.Durrant@xxxxxxxxxx>]

> -----Original Message-----
> From: Paul Durrant
> Sent: 28 November 2018 16:46
> To: 'Kevin Wolf' <kwolf@xxxxxxxxxx>
> Cc: 'Stefano Stabellini' <sstabellini@xxxxxxxxxx>; qemu-block@xxxxxxxxxx;
> qemu-devel@xxxxxxxxxx; xen-devel@xxxxxxxxxxxxxxxxxxxx; Eduardo Habkost
> <ehabkost@xxxxxxxxxx>; Michael S. Tsirkin <mst@xxxxxxxxxx>; Marcel
> Apfelbaum <marcel.apfelbaum@xxxxxxxxx>; Anthony Perard
> <anthony.perard@xxxxxxxxxx>; Paolo Bonzini <pbonzini@xxxxxxxxxx>; Richard
> Henderson <rth@xxxxxxxxxxx>
> Subject: RE: [Qemu-block] [PATCH 02/18] xen: introduce new 'XenBus' and
> 'XenDevice' object hierarchy
> 
> > -----Original Message-----
> > From: Kevin Wolf [mailto:kwolf@xxxxxxxxxx]
> > Sent: 28 November 2018 16:39
> > To: Paul Durrant <Paul.Durrant@xxxxxxxxxx>
> > Cc: 'Stefano Stabellini' <sstabellini@xxxxxxxxxx>; qemu-
> block@xxxxxxxxxx;
> > qemu-devel@xxxxxxxxxx; xen-devel@xxxxxxxxxxxxxxxxxxxx; Eduardo Habkost
> > <ehabkost@xxxxxxxxxx>; Michael S. Tsirkin <mst@xxxxxxxxxx>; Marcel
> > Apfelbaum <marcel.apfelbaum@xxxxxxxxx>; Anthony Perard
> > <anthony.perard@xxxxxxxxxx>; Paolo Bonzini <pbonzini@xxxxxxxxxx>;
> Richard
> > Henderson <rth@xxxxxxxxxxx>
> > Subject: Re: [Qemu-block] [PATCH 02/18] xen: introduce new 'XenBus' and
> > 'XenDevice' object hierarchy
> >
> > Am 28.11.2018 um 17:29 hat Paul Durrant geschrieben:
> > > > -----Original Message-----
> > > > From: Stefano Stabellini [mailto:sstabellini@xxxxxxxxxx]
> > > > Sent: 28 November 2018 16:28
> > > > To: Paul Durrant <Paul.Durrant@xxxxxxxxxx>
> > > > Cc: 'Kevin Wolf' <kwolf@xxxxxxxxxx>; qemu-block@xxxxxxxxxx; qemu-
> > > > devel@xxxxxxxxxx; xen-devel@xxxxxxxxxxxxxxxxxxxx; Stefano Stabellini
> > > > <sstabellini@xxxxxxxxxx>; Eduardo Habkost <ehabkost@xxxxxxxxxx>;
> > Michael
> > > > S. Tsirkin <mst@xxxxxxxxxx>; Marcel Apfelbaum
> > > > <marcel.apfelbaum@xxxxxxxxx>; Anthony Perard
> > <anthony.perard@xxxxxxxxxx>;
> > > > Paolo Bonzini <pbonzini@xxxxxxxxxx>; Richard Henderson
> > <rth@xxxxxxxxxxx>
> > > > Subject: RE: [Qemu-block] [PATCH 02/18] xen: introduce new 'XenBus'
> > and
> > > > 'XenDevice' object hierarchy
> > > >
> > > > On Wed, 28 Nov 2018, Paul Durrant wrote:
> > > > > > -----Original Message-----
> > > > > > From: Kevin Wolf [mailto:kwolf@xxxxxxxxxx]
> > > > > > Sent: 28 November 2018 16:19
> > > > > > To: Paul Durrant <Paul.Durrant@xxxxxxxxxx>
> > > > > > Cc: qemu-block@xxxxxxxxxx; qemu-devel@xxxxxxxxxx; xen-
> > > > > > devel@xxxxxxxxxxxxxxxxxxxx; Stefano Stabellini
> > > > <sstabellini@xxxxxxxxxx>;
> > > > > > Eduardo Habkost <ehabkost@xxxxxxxxxx>; Michael S. Tsirkin
> > > > > > <mst@xxxxxxxxxx>; Marcel Apfelbaum <marcel.apfelbaum@xxxxxxxxx>;
> > > > Anthony
> > > > > > Perard <anthony.perard@xxxxxxxxxx>; Paolo Bonzini
> > > > <pbonzini@xxxxxxxxxx>;
> > > > > > Richard Henderson <rth@xxxxxxxxxxx>
> > > > > > Subject: Re: [Qemu-block] [PATCH 02/18] xen: introduce new
> > 'XenBus'
> > > > and
> > > > > > 'XenDevice' object hierarchy
> > > > > >
> > > > > > Am 21.11.2018 um 16:11 hat Paul Durrant geschrieben:
> > > > > > > This patch adds the basic boilerplate for a 'XenBus' object
> that
> > > > will
> > > > > > act
> > > > > > > as a parent to 'XenDevice' PV backends.
> > > > > > > A new 'XenBridge' object is also added to connect XenBus to
> the
> > > > system
> > > > > > bus.
> > > > > > >
> > > > > > > The XenBus object is instantiated by a new xen_bus_init()
> > function
> > > > > > called
> > > > > > > from the same sites as the legacy xen_be_init() function.
> > > > > > >
> > > > > > > Subsequent patches will flesh-out the functionality of these
> > > > objects.
> > > > > > >
> > > > > > > Signed-off-by: Paul Durrant <paul.durrant@xxxxxxxxxx>
> > > > > >
> > > > > > > diff --git a/hw/xen/xen-bus.c b/hw/xen/xen-bus.c
> > > > > > > new file mode 100644
> > > > > > > index 0000000000..dede2d914a
> > > > > > > --- /dev/null
> > > > > > > +++ b/hw/xen/xen-bus.c
> > > > > > > @@ -0,0 +1,125 @@
> > > > > > > +/*
> > > > > > > + * Copyright (c) Citrix Systems Inc.
> > > > > > > + * All rights reserved.
> > > > > > > + */
> > > > > >
> > > > > > This doesn't look very compatible with the GPL. In fact it might
> > even
> > > > > > make it illegal for the QEMU project to distribute this code. :-
> )
> > > > > >
> > > > > > Other files you add throughout the series seem to have the same
> > > > problem.
> > > > > >
> > > > >
> > > > > I was working on the assumption that a lack of explicit license
> > meant
> > > > that the overall project license as described in item 2 in LICENSE.
> > Did I
> > > > misinterpret that text?
> > > >
> > > > It's "All rights reserved." the problem
> > >
> > > Oh, I see. I'm happy to remove that.
> >
> > That would be better at least. I'm not sure about files that have a
> > copyright header, but no license statement. Do such files exist yet in
> > the source tree?
> 
> Yes, there's quite a few... e.g. (first ones I tripped over)
> hw/rdma/rdma_backend.c, hw/virtio/vhost-backend.c, ...

Oh... I see they have a license statement but no boilerplate... is that 
statement enough?

  Paul

> 
> > To be on the safe side, I'd just stick with the
> > established practice, which is having a license header in every file.
> 
> Ok... if that is established practice. It really wasn't clear.
> 
> >
> > By the way, in a later patch you remove the existing license header,
> > which is different from the default license (because parts of the source
> > file are GPL 2 only). If you can't prove that all such parts (and parts
> > derived from them) have been removed, this is also a problem.
> >
> 
> What should I do? I am duplicating xen_disk, and then heavily modifying
> it. Should I just leave the old boilerplate in place?
> 
>   Paul
> 
> > Kevin

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