Re: [Xen-devel] Hypercalls from user-space

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Fri, 2010-09-24 at 20:14 +0100, Jeremy Fitzhardinge wrote: 
> On 09/24/2010 11:38 AM, Srujan D. Kotikela wrote:
> > Hi,
> >
> > Can anyone tell me how to invoke hypercalls from user space? Or any
> > pointers for the same.
> >
> > It's urgent, please help.
> >
> 
> You can't directly invoke hypercalls from userspace.   In a privileged
> domain you can use ioctls on /proc/xen/privcmd.

And libxenctrl (see tools/libxc in the source) includes C wrappers for
many of them, as well as the necessary low level helpers to invoke the
ioctls etc.

Ian.


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