Userspace application can do a hypercall through /dev/xen/privcmd, and some for some hypercalls argument is a pointers to user-provided structure. When SMAP is supported and enabled, hypervisor can't access. So, lets allow it.

The same applies to HYPERVISOR_dm_op, where additionally privcmd driver carefully verify buffer addresses.

Cc: sta...@vger.kernel.org Signed-off-by: Marek Marczykowski-Górecki <marm...@invisiblethingslab.com>