xen: XENMEM_machphys_mfn_list hypercall

The XENMEM_machphys_mfn_list implementation reads 'max_extents' and
'extents_start'.  It writes to the array at 'extents_start', and writes the
number of extents written into the 'nr_extents' field.

From: Andrew Cooper <andrew.cooper3@citrix.com>
Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
Signed-off-by: Ian Campbell <ian.campbell@citrix.com>


git-svn-id: svn://svn.valgrind.org/valgrind/trunk@13729 a5019735-40e9-0310-863c-91ae7b9d1cf9
2 files changed