Re: [Qemu-devel] [PATCH 0/2] 3270 improvements

[Halil Pasic <pasic@linux.vnet.ibm.com>]

On 09/21/2017 12:48 PM, Cornelia Huck wrote:
> On Thu, 21 Sep 2017 12:22:30 +0200
> Halil Pasic <pasic@linux.vnet.ibm.com> wrote:
> 
>> On 09/21/2017 11:24 AM, Cornelia Huck wrote:
>>> On Wed, 20 Sep 2017 19:23:12 +0200
>>> Halil Pasic <pasic@linux.vnet.ibm.com> wrote:
>>>   
>>>> Jason found some problems with 3270 which he traced down to insufficient
>>>> output buffer size. I've looked into the underlying issue (and the
>>>> relevant code) and I saw strange things. Among others an unreasonable
>>>> assert requiring the payload of a ccw being less than some more or
>>>> less arbitrary limit (dictated by the size of the output buffer).
>>>>
>>>> Because we were already considering converting 3270 to CcwDataStream I've
>>>> decided to try do get rid of this strange limitation on the length of the
>>>> writes too. 
>>>>
>>>> This series depends on my IDA work, which can be found here:
>>>> https://lists.nongnu.org/archive/html/qemu-devel/2017-09/msg03434.html.
>>>>
>>>> Halil Pasic (2):
>>>>   s390x/3270: IDA support for 3270 via CcwDataStream
>>>>   s390x/3270: handle writes of arbitrary length
>>>>
>>>>  hw/char/terminal3270.c      | 46 +++++++++++++++++++++++++++------------------
>>>>  hw/s390x/3270-ccw.c         |  4 ++--
>>>>  include/hw/s390x/3270-ccw.h |  5 ++---
>>>>  3 files changed, 32 insertions(+), 23 deletions(-)
>>>>  
>>>
>>> Are you planning to do some further work on 3270, btw?
>>>   
>>
>> I did not. I jumped in because of IDA, and because I did
>> not agree with increasing the buffer size to another arbitrary
>> an value (and essentially keep the bug). I hope the original
>> authors will do further polishing.
> 
> That was actually a plural 'you' (a pity that English uses the same
> word for both...)
> 

OK, I've projected it to myself.

>>
>> I'm just curious, what's behind the question?
> 
> Just whether I can expect more 3270 changes in the future :) Things
> like support for multiple devices, whatever. Mostly curiousity.
> 

Actually, I wanted to ask the same question from the guy
responsible for the answer. I don't know yet, but I'm sure
now I want to ask (Stefan R.). I will let you know later.

Halil