All,
     Attached is a simple patch to fix core dumps for 32-bit guests running on
32-bit HV/dom0.  The problem ends up being a cast in the libxc dumping code;
basically in xc_core_x86.c, p2m_size is a ulong, and in the case of a 32-bit FV
guest 0xFFFFF is returned from xc_memory_op() in nr_gpfns.  However, 1 is then
added.  This means that when we are doing the map->size calculations, we have
0x100000 << 12, which yields 0, which is then stored in the uint64 map->size.
The simple fix is to cast p2m_size up to 64-bits first, then do the shift, then
store it into map->size.
     The patch is against xen-3.1, but should apply to current xen-unstable.

Signed-off-by: Chris Lalancette <clalance@redhat.com>