Recently a new dm_op hypercall was added to Xen to provide a mechanism
for restricting device emulators (such as QEMU) to a limited set of
hypervisor operations, and being able to audit those operations in the
kernel of the domain in which they run.
This patch adds IOCTL_PRIVCMD_DM_OP as gateway for __HYPERVISOR_dm_op.
NOTE: There is no requirement for user-space code to bounce data through
locked memory buffers (as with IOCTL_PRIVCMD_HYPERCALL) since
privcmd has enough information to lock the original buffers
 http://xenbits.xen.org/gitweb/?p=xen.git;a=commit;h=524a98c2Signed-off-by: Paul Durrant <email@example.com>
Acked-by: Stefano Stabellini <firstname.lastname@example.org>
Signed-off-by: Boris Ostrovsky <email@example.com>