On Thu, Jul 30, 2015 at 06:03:12PM +0100, David Vrabel wrote: > 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@xxxxxxxxxx> Reviewed-by: Daniel Kiper <daniel.kiper@xxxxxxxxxx> Daniel PS FYI, next week I am on vacation. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>