Re: [PATCH] [RFC] sysfs support for xen linux

[Anthony Liguori <aliguori@us.ibm.com>]

Mark Williamson wrote:

>>Yes, true. I think privcmd might be more appropriate for /proc, but
>>would like to see how it works as a binary file under /sys. ioctl's are
>>not supported by sysfs that I can see, so privcmd would have to be a
>>read/write interface.
>>
>>Regardless of privcmd there are numerous simple attributes related to
>>Xen that are consistent with "zen" of sysfs. :-)
>>    
>>
>
>Agreed.  It's an ideal place for many of the things that are in proc, and many 
>things we'd want to add in the future.
>
>You could possibly abuse sysfs into supporting ioctl but I'm pretty sure the 
>kernel people would find that quite distressing ;-)  I had the impression 
>binary files under sysfs were also a no-no (all meant to be cat-able - 
>addressing one of the other problems of /proc), but I could be mistaken.
>  
>
There was a discussion a while back about this.

http://permalink.gmane.org/gmane.comp.emulators.xen.devel/14273

I think the consensus was to move any ioctl interface to a char device 
and everything else to sysfs.

You'll probably want a proper kobject hierarchy too which means working 
with GKH et al to figure out where out stuff should be 
(/sys/hypervisor/xen??)

Regards,

Anthony Liguori

>Cheers,
>Mark
>
>  
>