All,
     Attached is a patch to do some additional error checking in QEMU when
setting up the Cirrus Logic video device.  In particular, it may be the case
that that set_mm_mapping() fails because of xc_domain_populate_physmap().  In
this case, we should not blindly go on; the xc_map_foreign_batch() that follows
will cause a page fault and, at best, get mapped in a zeroed page from the dom0
(which is not what we want).  While I'm in here, fix a memory leak on an error path.

The patch is against 3.1.0, but should apply fairly easily to xen-unstable.

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