Re: [Xen-devel] [PATCH] [RFC] sysfs support for xen linux

[Anthony Liguori <aliguori@xxxxxxxxxx>]

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
>
>  

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