tree 13c9a6a80d575d706e8b689604047d0591ffad91
parent 8edfcf882eb91ec9028c7334f90f6ef3db5b0fcf
author David Vrabel <david.vrabel@citrix.com> 1437573037 +0100
committer David Vrabel <david.vrabel@citrix.com> 1445606431 +0100

xen/balloon: pre-allocate p2m entries for ballooned pages

Pages returned by alloc_xenballooned_pages() will be used for grant
mapping which will call set_phys_to_machine() (in PV guests).

Ballooned pages are set as INVALID_P2M_ENTRY in the p2m and thus may
be using the (shared) missing tables and a subsequent
set_phys_to_machine() will need to allocate new tables.

Since the grant mapping may be done from a context that cannot sleep,
the p2m entries must already be allocated.

Signed-off-by: David Vrabel <david.vrabel@citrix.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>