Re: Unable to unload kvm-intel module

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

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On 2011-06-17 00:10, AP wrote:
> On Tue, Jun 14, 2011 at 11:37 PM, Jan Kiszka <jan.kiszka@web.de> wrote:
>> On 2011-06-14 23:10, AP wrote:
>>> On Tue, Jun 14, 2011 at 1:05 PM, Jan Kiszka <jan.kiszka@web.de> wrote:
>>>> On 2011-06-14 20:30, AP wrote:
>>>>> On Tue, Jun 14, 2011 at 1:32 AM, Avi Kivity <avi@redhat.com> wrote:
>>>>>> On 06/13/2011 08:11 PM, AP wrote:
>>>>>>>
>>>>>>> On Sun, Jun 12, 2011 at 8:35 AM, Avi Kivity<avi@redhat.com>  wrote:
>>>>>>>>  On 06/11/2011 03:02 AM, AP wrote:
>>>>>>>>>
>>>>>>>>>  I am building kvm as an external module against 2.6.38-8 (Ubuntu 11.04
>>>>>>>>>  kernel).
>>>>>>>>
>>>>>>>>  Why?
>>>>>>>
>>>>>>> I did not want move to the new kernel from kvm.git.
>>>>>>
>>>>>> I generally find that it works well, though I only run it on servers.
>>>>>>
>>>>>>> I just wanted to
>>>>>>> upgrade to the latest kvm module for some development. Is there a way
>>>>>>> to use the kvm.git tree and only build and load kvm?
>>>>>>
>>>>>> kvm-kmod.
>>>>>
>>>>> That is what I am using and running in to the permanent module issue.
>>>>
>>>> What version of kvm-kmod? What are your steps to reproduce?
>>>>
>>>> I've just checked the kvm-kmod-2.6.39 release in an Ubuntu 11.4 VM, and
>>>> it's loading&unloading fine.
>>>
>>> I am following the instruction that I found here under "building an
>>> external module with older kernels":
>>> http://www.linux-kvm.org/page/Code
>>>
>>> I ran:
>>> git clone git://git.kernel.org/pub/scm/virt/kvm/kvm-kmod.git
>>> cd kvm-kmod
>>> git submodule update --init
>>> ./configure --kerneldir=/lib/modules/2.6.38-8-generic/build
>>> make sync
>>> make
>>>
>>> I am at:
>>> commit bed5dfdeb11cf3a749396e4c353018bae5aff66f
>>> Author: Jan Kiszka <jan.kiszka@siemens.com>
>>> Date:   Wed Jun 1 09:08:49 2011 +0200
>>>
>>>     Update source link
>>>
>>>     Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
>>>
>>> The kvm source comes from the kernel tree that is part of kvm-kmod i.e
>>> in the linux-2.6 directory.
>>>
>>> Thanks,
>>> AP
>>
>> Still unreproducible here - and unexplainable. Can you debug your setup
>> further, maybe following the suspect you had regarding CONFIG_MODULE_UNLOAD?
> 
> I am not able to figure out how kvm.mod.c and kvm-intel.mod.c get
> created at compile time. Could you please give me a pointer to where
> that happens?

That's embedded in the standard build process of the kernel. If Ubuntu
didn't break it, the config should remain stable between primary source
files (as provided by kvm-kmod) and the generated ones (like *.mod.c).
So let's first check if the config used is consistent by adding

#ifndef CONFIG_MODULE_UNLOAD
#warning CONFIG_MODULE_UNLOAD missing!
#endif

to the end of x86/vmx.c (do not re-run 'make sync' afterward).

Jan


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