Attached is the patch for enabling the GNTTAB_copy hypercall
for HVMs. For 64 bit guests the grant_table.c functionality is used as is done
by PVs but for 32 bit guests on 64 bit Xen, the compat/grant_table.c
functionality is used.
This patch applies cleanly on the latest xen-unstable cset.
Signed-off-by: Steven Smith <steven.smith@xxxxxxxxxx>