Re: [Qemu-devel] State of KVM bits in linux-headers

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On 2012-01-11 20:46, Alexander Graf wrote:
> 
> On 11.01.2012, at 20:41, Anthony Liguori wrote:
> 
>> On 01/11/2012 01:38 PM, Jan Kiszka wrote:
>>>>
>>>>> I would like to see us avoiding this in the future. Headers update
>>>>> patches should mention the source and should not be merged until the ABI
>>>>> changes actually made it at least into kvm.git. Same applies, of course,
>>>>> to the functional changes related to that ABI. Otherwise we risk quite
>>>>> some mess on everyone's side.
>>>>
>>>> I agree.
>>>>
>>>>> Another thing: KVM_CAP_PPC_HIOR has been removed again from the kernel
>>>>> and also the header. Is there real free space now or will the cap
>>>>> reappear? If there should better be a placeholder, let's add it (to the
>>>>> kernel).
>>>>
>>>> I will reappear with ONE_REG semantics.
>>>>
>>>
>>> OK.
>>>
>>> Then please clean up now so that update-linux-headers.sh can be used
>>> again by "normal" developers. :)
>>
>> Before we did submodules and had a responsive BIOS maintainer, we maintained patches within qemu.git for our external dependencies.  I think that's a good strategy here too.  It's a little painful, but not entirely awful.
>>
>> At least it makes it possible for you to (hopefully) trivial rebase a patch if something is still in limbo.
> 
> Yeah, that works. I can easily script that part. It doesn't solve the actual underlying problem though that we don't know when the abi is actually stable. I'm slowly starting to understand Pekka ;).

IIRC, we never had this problem with qemu-kvm - as the merges were
coordinated with the kernel (subsystem) tree.

Jan

-- 
Siemens AG, Corporate Technology, CT T DE IT 1
Corporate Competence Center Embedded Linux
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