Date: Thu, 3 Feb 2011 19:35:03 +0000 (UTC) From: "Bjoern A. Zeeb" <bzeeb-lists@lists.zabbadoz.net> To: Monthadar Al Jaberi <monthadar@gmail.com> Cc: FreeBSD virtualization mailing list <freebsd-virtualization@freebsd.org> Subject: Re: simulating wireless device (if_alloc panic, VirtualBox, VIMAGE) Message-ID: <20110203193259.L80258@maildrop.int.zabbadoz.net> In-Reply-To: <AANLkTinuAt37kz=h9tXJBOKUZTaZBQhDx-LMqh_Pmjq2@mail.gmail.com> References: <AANLkTik8D_bLwcUKZdBT-kpkJdDXtPTLvAqfUe0cLoSz@mail.gmail.com> <4D484213.6050100@freebsd.org> <AANLkTikJKZLQVA5X2PQs0oT4iFsZYBw7K07kjQTc9iGD@mail.gmail.com> <4D486108.5060805@freebsd.org> <AANLkTi=mk2vfyXJBaK5mV2sBWEj0-RDZneLs%2BXq_c7sb@mail.gmail.com> <20110202164827.I80258@maildrop.int.zabbadoz.net> <4D4994CE.2090209@freebsd.org> <AANLkTimDZRefv57_nanxGUbHjP1wqeQ41iWHvpXogmvU@mail.gmail.com> <4D49AB29.7070909@freebsd.org> <AANLkTinONnLE9D=c57nQmGBFbWJgqJmeKiRViW3gga2a@mail.gmail.com> <20110203095019.N80258@maildrop.int.zabbadoz.net> <AANLkTinY0AVSsEE5PZaJOqyuinsAN6wkUL9URAqYs0X4@mail.gmail.com> <20110203105747.K80258@maildrop.int.zabbadoz.net> <AANLkTi==53twyjoHL3uc4EQJCkMWdxuc9cvTNJSVuDuy@mail.gmail.com> <20110203111206.S80258@maildrop.int.zabbadoz.net> <AANLkTinuAt37kz=h9tXJBOKUZTaZBQhDx-LMqh_Pmjq2@mail.gmail.com>
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On Thu, 3 Feb 2011, Monthadar Al Jaberi wrote:
> On Thu, Feb 3, 2011 at 12:18 PM, Bjoern A. Zeeb
> <bzeeb-lists@lists.zabbadoz.net> wrote:
>> On Thu, 3 Feb 2011, Monthadar Al Jaberi wrote:
>>
>>> On Thu, Feb 3, 2011 at 11:59 AM, Bjoern A. Zeeb
>>> <bzeeb-lists@lists.zabbadoz.net> wrote:
>>>>
>>>> On Thu, 3 Feb 2011, Monthadar Al Jaberi wrote:
>>>>
>>>>>>>> I don't understand why you saw a CRED_TO_VNET of 0
>>>>>>>> I was under the impression that every process/thread in the system
>>>>>>>> would
>>>>>>>> be
>>>>>>>> on vnet0
>>>>>>>> in a vimage kernel.
>>>>>>>
>>>>>>> This is how my printf looks like:
>>>>>>> struct thread *td =3D curthread;
>>>>>>> struct vnet *v =3D TD_TO_VNET(td);
>>>>>>> struct ucred *cred =3D CRED_TO_VNET(td->ucred);
>>>>>>> struct vnet *td_vnet =3D td->td_vnet;
>>>>>>
>>>>>> here's your problem:
>>>>>>
>>>>>> strcut vnet *vnet =3D cred->cr_prison->pr_vnet;
>>>>>
>>>>> When I add CURVNET_SET(CRED_TO_VNET(curthread->td_ucred)); I get a pa=
nic
>>>>> too...
>>>>> But your suggestion works if I do like this:
>>>>> curthread->td_vnet =3D curthread->td_ucred->cr_prison->pr_vnet;
>>>>>
>>>>> CRED_TO_VNET(curthread->td_ucred) returns NULL
>>>>
>>>> I wonder how you are building your module and if VIMAGE is properly
>>>> defined. =A0If it's not that would explain a lot of things.
>>>
>>> I have put options VIMAGE, rebuild both world and kernel.
>>>
>>> I can create jails with vnet options...
>>>
>>> I build my module with the standard Makefile for modules:
>>> ...
>>> KMOD =A0 =A0=3D =A0wtap
>>> ...
>>> SRCS =A0 =A0=3D =A0if_wtap_module.c if_wtap.c if_medium.c hal.c
>>>
>>> .include <bsd.kmod.mk>
>>
>> Right but are you building your module along with the kernel or
>> outside the tree? =A0In the latter case you may want to add soemthing
>> like
>>
>> SRCS+=3D =A0 =A0 =A0 =A0 =A0opt_global.h
>>
>> .if defined(KERNBUILDDIR)
>> MKDEP=3D =A0 =A0 =A0 =A0 =A0-include ${KERNBUILDDIR}/opt_global.h
>> .else
>> CFLAGS+=3D =A0 =A0 =A0 =A0-include opt_global.h
>> MKDEP=3D =A0 =A0 =A0 =A0 =A0-include opt_global.h
>>
>> opt_global.h:
>> =A0 =A0 =A0 =A0echo "#define VIMAGE 1" > ${.TARGET}
>> .endif
>>
>> and/or point KERNBUILDDIR to where you built your kernels.
>
> Thanks it works now..
One thing you should be aware of is that if you will compile without
KERNBUILDDIR set, your module will not work on a non-VIMAGE kernel.
Unfortuantely we can only have defaults for one or the other in the
case. Worst you may want to only do the "echo" if there was a command
line option like -DVIMAGE or the like. Note, setting it to 0 will not
do the trick as it would still be defined.
/bz
--=20
Bjoern A. Zeeb You have to have visions!
<ks> Going to jail sucks -- <bz> All my daemons like it!
http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/jails.html
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