Re: Re: Difficulties inserting external modules in dom0 & using a serial port

Re: Re: Difficulties inserting external modules in dom0 & using a serial port

[Michael LeMay]

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As an update, I figured out the "force_evtchn_callback" problem.  My 
module used the spin_lock_irq and spin_unlock_irq routines, which 
eventually trickled back to force_evtchn_callback.  I'm cross-posting 
this to -devel in case this is a real problem.  It seems like these 
calls should be supported...  Thanks for the help!

Molle Bestefich wrote:
> Michael LeMay wrote:
>   
>> FATAL: Error inserting 8250 (...): Device or resource busy
>>     
>
> Xen uses the console too, you might want to check your boot options
> and the documentation.
>
> Perhaps the busy error code refers to an IRQ (check the 8250 source
> code to make sure), so you could look in /proc/interrupts and see if
> anything else is using the same IRQ that the 8250 is trying to grab.
>
> Same problem, clue about 8250 being modularized on SuSE but not other distros:
> http://article.gmane.org/gmane.comp.emulators.xen.user/2504
>
> Same problem, possible solution offered (didn't work) and a clue about
> IRQ problems:
> http://article.gmane.org/gmane.comp.emulators.xen.user/4275
> http://article.gmane.org/gmane.comp.emulators.xen.user/4290
> http://article.gmane.org/gmane.comp.emulators.xen.user/4298
>
> Same problem, no solution:
> http://article.gmane.org/gmane.comp.emulators.xen.user/97
>
>
>   
>> x10_cm19a: Unknown symbol force_evtchn_callback
>>     
>
> Nothing else in dmesg or syslog?
>
> I usually solve this kind of problem by fiddling with the kernel version :-)...
>
> Same problem, no solution:
> http://article.gmane.org/gmane.comp.emulators.xen.user/10337
> http://article.gmane.org/gmane.comp.emulators.xen.user/10354
> http://article.gmane.org/gmane.comp.emulators.xen.user/10414
>
> Same problem, impolite enough to crosspost to users- and devel-list, no replies:
> http://article.gmane.org/gmane.comp.emulators.xen.user/9892
>
> Same problem, no replies:
> http://article.gmane.org/gmane.comp.emulators.xen.user/10543
>
> _______________________________________________
> Xen-users mailing list
> Xen-users@lists.xensource.com
> http://lists.xensource.com/xen-users
>   


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Re: [Xen-users] Re: Difficulties inserting external modules in dom0 & using a serial port

[Molle Bestefich]

Michael LeMay wrote:
> As an update, I figured out the "force_evtchn_callback" problem.
> My module used the spin_lock_irq and spin_unlock_irq routines,

No clue whether it's a bug that they're not supported, but
I'd suspect a bug in Xen on account of 8250 not working when it's
loaded as a module?

> Thanks for the help!

Cool that you got it working :-).
Consider adding to
http://wiki.xensource.com/xenwiki/CoolConfigurations if you're doing
something really fancy with Xen ;-)..