Date: Thu, 03 Feb 2011 09:11:51 -0800 From: Julian Elischer <julian@freebsd.org> To: "Bjoern A. Zeeb" <bzeeb-lists@lists.zabbadoz.net> Cc: FreeBSD virtualization mailing list <freebsd-virtualization@freebsd.org> Subject: Re: simulating wireless device (if_alloc panic, VirtualBox, VIMAGE) Message-ID: <4D4AE1D7.9030106@freebsd.org> In-Reply-To: <20110203105747.K80258@maildrop.int.zabbadoz.net> 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>
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On 2/3/11 2:59 AM, Bjoern A. Zeeb 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 = curthread; >>>> struct vnet *v = TD_TO_VNET(td); >>>> struct ucred *cred = CRED_TO_VNET(td->ucred); >>>> struct vnet *td_vnet = td->td_vnet; >>> >>> here's your problem: >>> >>> strcut vnet *vnet = cred->cr_prison->pr_vnet; >> >> When I add CURVNET_SET(CRED_TO_VNET(curthread->td_ucred)); I get a >> panic too... >> But your suggestion works if I do like this: >> curthread->td_vnet = 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. If it's not that would explain a lot of things. > > >>>> printf("td=%p, td->td_vnet=%p, td->td_ucred=%p, TD_TO_VNET=%p, >>>> CRED_TO_VNET=%p\n", td, td_vnet, td->td_ucred, v, cred); >>>> >>>> I made a fast search in /usr/src for "td_vnet" and found it was >>>> assigned only in >>>> int fork1(td, flags, pages, procp): >>>> #ifdef VIMAGE >>>> td2->td_vnet = NULL; >>>> td2->td_vnet_lpush = NULL; >>>> #endif >>> >>> Nice try. Want another search? Hint: there is this in vnet.h: >>> >>> #define curvnet curthread->td_vnet >>> >>> And then you'll, again, find the CURVNET_SET_* macros. >> >> Thank you > > Something you may find useful as well btw is: > > http://people.freebsd.org/~bz/20100530-02.vnet.9.html that's excellent! checkin? > > > _______________________________________________ > freebsd-virtualization@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-virtualization > To unsubscribe, send any mail to "freebsd-virtualization-unsubscribe@freebsd.org"
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