xen/pvshim: use default position for the m2p mappings

xen/pvshim: use default position for the m2p mappings

When running a 32bit kernel as Dom0 on a 64bit hypervisor the
hypervisor will try to shrink the hypervisor hole to the minimum
needed, and thus requires the Dom0 to use XENMEM_machphys_mapping in
order to fetch the position of the start of the hypervisor virtual
mappings.

Disable this feature when running as a PV shim, since some DomU
kernels don't implemented XENMEM_machphys_mapping and break if the m2p
doesn't begin at the default address.

NB: support for the XENMEM_machphys_mapping was added in Linux by
commit 7e7750.

Signed-off-by: Roger Pau Monné <roger.pau@citrix.com>
Acked-by: Jan Beulich <jbeulich@suse.com>