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

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?



Mike D. Day
STSM and Architect, Open Virtualization
IBM Linux Technology Center

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