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

On Thu, Jan 12, 2006 at 02:11:10PM -0500, Mike D. Day wrote:
> Anthony Liguori wrote:
> >Arjan van de Ven wrote:
> >
> >>On Thu, 2006-01-12 at 12:53 -0600, Anthony Liguori wrote:
> >> 
> >>
> >>>We wish to make management hypercalls as the root user in userspace 
> >>>which means we have to go through the kernel.  Currently, we do this
> >>>by having /proc/xen/privcmd accept an ioctl() that takes a structure
> >>>that describe the register arguments.  The kernel interface allows us 
> >>>to control who in userspace can execute hypercalls.
> >>>  
> >>
> >>ioctls on proc is evil though (so is ioctl-on-sysfs). It's a device not
> >>a proc file!
> >> 
> >>
> >I full heartedly agree with you :-)
> What about making hypercalls via with a read/write interface into memory 
> mapped by a char device? Any problems with that approach?

Yes, just make it a syscall as our other sub-thread details.


greg k-h

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