Re: [PATCH 2/2] kvm-kmod: Document the build process

[Jan Kiszka <jan.kiszka@siemens.com>]

Dietmar Maurer wrote:
> 
>> -----Original Message-----
>> From: kvm-owner@vger.kernel.org [mailto:kvm-owner@vger.kernel.org] On
>> Behalf Of Wolfgang Mauerer
>> Sent: Mittwoch, 21. Oktober 2009 16:21
>> To: Dietmar Maurer
>> Cc: kvm@vger.kernel.org; Kiszka, Jan
>> Subject: Re: [PATCH 2/2] kvm-kmod: Document the build process
>>
>> Hio,
>>
>> Dietmar Maurer wrote:
>>>> +  Before the kvm module can be built, the linux submodule must be
>>>> initialised
>>>> +  and populated. The required sequence of commands is
>>>> +
>>>> +  git submodule init
>>>> +  git submodule update
>>>> +  ./configure
>>>> +  make sync
>>>> +  make
>>>> +
>>>> +  Notice that you can also specify an existing Linux tree for the
>>>> + synchronisation stage by using
>>>> +
>>>> +  make sync LINUX=/path/to/tree
>>> I always get errors when i try to sync (with our Linux-2.6.24 tree)
>>>
>>> ./configure --kerneldir=${TOP}/linux-2.6.24-openvz
>>> make sync LINUX=${TOP}/linux-2.6.24-openvz
>>>
>>> make[1]: Entering directory `/a/dir/kvm-kmod-2.6.30.1'
>>> ./sync kvm-kmod-2.6.30.1
>>> Traceback (most recent call last):
>>>   File "./sync", line 210, in <module>
>>>     header_sync(arch)
>>>   File "./sync", line 181, in header_sync
>>>     hack(T, 'x86', 'include/linux/kvm.h')
>>>   File "./sync", line 127, in hack
>>>     _hack(T + '/' + file, arch)
>>>   File "./sync", line 118, in _hack
>>>     data = file(fname).read()
>>> IOError: [Errno 2] No such file or directory:
>> 'header/include/linux/kvm.h'
>>> make[1]: *** [sync] Error 1
>>>
>>> Any idea whats wrong?
>> Do you have a checked out Linux tree in linux-2.6/?
> 
> Sorry, seem I am confused. You wrote
> 
>>> +  make sync LINUX=/path/to/tree
> 
> So why do I need another linux tree? Can't we fix the 'sync' script?

There is nothing to fix. The sync script takes the KVM kernel module
sources from a recent kernel A and patch them so that kvm-kmod can build
them for an ancient kernel B.

Now you have two options where this kernel A could be located on sync:
by default (LINUX unset), it is in kvm-kmod/linux-2.6 (that git
submodule). Or you define a different local tree via
LINUX=/path/to/kernel/A - like above.

Jan

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