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Re: [Qemu-devel] [PULL 22/62] block: Support Archipelago as a QEMU block


From: Stefan Hajnoczi
Subject: Re: [Qemu-devel] [PULL 22/62] block: Support Archipelago as a QEMU block backend
Date: Thu, 9 Apr 2015 15:05:56 +0100

On Thu, Apr 9, 2015 at 1:48 PM, Chrysostomos Nanakos <address@hidden> wrote:
> On 2015-04-09 06:48, Andreas Färber wrote:
>>
>> Am 08.08.2014 um 19:39 schrieb Kevin Wolf:
>>>
>>> From: Chrysostomos Nanakos <address@hidden>
>>>
>>> VM Image on Archipelago volume is specified like this:
>>>
>>>
>>>
>>> file.driver=archipelago,file.volume=<volumename>[,file.mport=<mapperd_port>[,
>>> file.vport=<vlmcd_port>][,file.segment=<segment_name>]]
>>>
>>> 'archipelago' is the protocol.
>>>
>>> 'mport' is the port number on which mapperd is listening. This is
>>> optional
>>> and if not specified, QEMU will make Archipelago to use the default port.
>>>
>>> 'vport' is the port number on which vlmcd is listening. This is optional
>>> and if not specified, QEMU will make Archipelago to use the default port.
>>>
>>> 'segment' is the name of the shared memory segment Archipelago stack is
>>> using.
>>> This is optional and if not specified, QEMU will make Archipelago to use
>>> the
>>> default value, 'archipelago'.
>>>
>>> Examples:
>>>
>>> file.driver=archipelago,file.volume=my_vm_volume
>>> file.driver=archipelago,file.volume=my_vm_volume,file.mport=123
>>> file.driver=archipelago,file.volume=my_vm_volume,file.mport=123,
>>> file.vport=1234
>>> file.driver=archipelago,file.volume=my_vm_volume,file.mport=123,
>>> file.vport=1234,file.segment=my_segment
>>>
>>> Signed-off-by: Chrysostomos Nanakos <address@hidden>
>>> Reviewed-by: Stefan Hajnoczi <address@hidden>
>>> Signed-off-by: Kevin Wolf <address@hidden>
>>> ---
>>>  MAINTAINERS         |   6 +
>>>  block/Makefile.objs |   2 +
>>>  block/archipelago.c | 787
>>> ++++++++++++++++++++++++++++++++++++++++++++++++++++
>>>  configure           |  40 +++
>>>  4 files changed, 835 insertions(+)
>>>  create mode 100644 block/archipelago.c
>>
>>
>> Judging by configure output in v2.3.0-rc2, QEMU seems to rely on
>> libxseg, which is GPL-3.0+: https://github.com/grnet/libxseg
>>
>> How can anyone legally build this backend then? o.O
>>
>> Any chance libxseg can be relicensed to GPL-2.0+?
>>
>
> Hello Andreas,
> indeed the license has changed a few months after submitting the patch for
> the block driver to QEMU. I have already contacted the administration
> of GRNET which is responsible for this change asking them about the
> aforementioned problem. I am waiting for the reply and hopefully we will
> resolve this license matter.

In the meantime I've sent a patch to disable Archipelago by default in
./configure ("[PATCH for-2.3] configure: disable by default and warn
about libxseg GPLv3 license").  You are CCed on the email.

The intention is to reduce the chance of users accidentally compiling
binaries with license problems.  Archipelago support is still
available but it must be explicitly enabled using ./configure
--enable-archipelago.

Stefan



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