Re: help? need to enable VT-d for 2.6.27

Jan Kiszka
2011-08-31T07:32:22Z

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On 2011-08-31 01:03, Chris Friesen wrote:
> On 08/30/2011 01:59 PM, Jan Kiszka wrote:
>> On 2011-08-30 21:39, Chris Friesen wrote:
>
>>> 2) If I create such a link, it builds a few files, and then gives the
>>> following:
>>>
>>> /home/cfriesen/Download/kvm-kmod-3.0b/x86/x86.c: In function
>>> ‘vcpu_enter_guest’:
>>> /home/cfriesen/Download/kvm-kmod-3.0b/x86/x86.c:5539:26: error:
>>> ‘prof_on’ undeclared (first use in this function)
>>> /home/cfriesen/Download/kvm-kmod-3.0b/x86/x86.c:5539:26: note: each
>>> undeclared identifier is reported only once for each function it
>>> appears in
>>>
>>>
>>> This appears to be due to the fact that KVM_PROFILING is defined
>>> unconditionally in my kernel, but "prof_on" is only defined if
>>> CONFIG_PROFILING is enabled. Commenting out that chunk of code in x86.c
>>> lets everything build.
>>
>> If CONFIG_PROFILING is off, prof_on is defined to 0. But we may miss
>> some include on older kernels. Does adding linux/profile.h to x86.c
>> solve the issue as well?
>
>
> It would appear that I got the explanation wrong. CONFIG_PROFILING is
> enabled on my kernel. The problem is that our OS vendor has included a
> patch to convert prof_on to immediate values, which requires a change in
> x86.c.

Ah, now I remember: LTTng fallouts. I think there was just some
EXPORT_SYMBOL missing in the kernel, but my memory is weak.

Jan

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