Re: [Xenomai] kvm freeze with ipipe patch for kernel 3.x

[Jan Kiszka <jan.kiszka@web.de>]

On 2013-03-02 15:20, Gilles Chanteperdrix wrote:
> On 03/02/2013 12:12 PM, Jan Kiszka wrote:
> 
>> On 2013-03-02 12:01, Gilles Chanteperdrix wrote:
>>> On 03/02/2013 09:17 AM, Jan Kiszka wrote:
>>>
>>>> On 2013-03-02 01:47, Gabriele Moabiti wrote:
>>>>>
>>>>>
>>>>> ----- Messaggio originale -----
>>>>>
>>>>> Da: Jan Kiszka <jan.kiszka@siemens.com>
>>>>> On 2013-03-01 18:09, Jan Kiszka wrote:
>>>>>> There is more broken, even in latest stable 3.5.7. See the patches at
>>>>>> [1] for a tested version. Unfortunately, I cannot update my tree for 3.8
>>>>>> ATM as git services seem to be down on xenomai.org.
>>>>>
>>>>> Does this and other important patches will be backported to 3.2?
>>>>
>>>> I'm planning to get them merged into 3.8 first of all, maybe also into
>>>> 3.5 (as this is our current production baseline). No plans exist beyond
>>>> that. I'd rather like to leave older kernels alone to reduce maintenance
>>>> efforts (porting is simple, proper testing takes time).
>>>>
>>>> Also note that 3.2 is lacking much more critical fixes than those few
>>>> around KVM. IOW: Don't use it for anything serious with x86.
>>>
>>>
>>> Maybe reverting the mprotect/ipipe_pin_vma patches in the 3.2 branch, so
>>> as to avoid the zero page corruption, but take some faults sometimes
>>> would be a simple, feasible solution? 3.2 seems to have been chosen as a
>>> long term stable branch.
>>
>> Again, the problem is not writing the patches
> 
> 
> It is easy to forget a patch when (back)porting patches from an I-pipe
> to the other.
> 
>> but testing all the stuff
>> in all necessary combinations.
> 
> 
> I can test 4 combinations at once: i686 UP, i686 SMP and x86_64 (UP or
> SMP), this leaves only one combination to test.

That's a small subset of the relevant variation. They come with enabling
different config options or using certain features. Do you have a test
setup for KVM on I-pipe e.g.? I'm not saying we catch them all with the
development head, but adding more versions to the test matrix doesn't
make it better.

> 
>> BTW, 3.4 is also LTS, and there we have those fixes at least (just not
>> yet pulled into the mainline).
> 
> 
> Are you sure you have not missed any patches for 3.4?

I was sure regarding important patches by the time I sent the pull.
Didn't check again since then.

Jan

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