# HG changeset patch
# User yamahata@xxxxxxxxxxxxx
# Node ID 6c2ab5cfca56255320c82a36ebc35ad31d3951d5
# Parent  4f7ee25edd8141b6fa44f385d10cef62e18a2bb9
balloon driver: when autotranslate mode, pages are returned to xen without
traverseing init_mm
This change is needed for xen/ia64 vp model.

Signed-off-by: Isaku Yamahata <yamahata@xxxxxxxxxxxxx>

diff -r 4f7ee25edd81 -r 6c2ab5cfca56 linux-2.6-xen-sparse/drivers/xen/balloon/balloon.c
--- a/linux-2.6-xen-sparse/drivers/xen/balloon/balloon.c	Sat Apr 29 13:17:03 2006 +0900
+++ b/linux-2.6-xen-sparse/drivers/xen/balloon/balloon.c	Sat Apr 29 13:19:39 2006 +0900
@@ -548,9 +548,22 @@ struct page *balloon_alloc_empty_page_ra
 	scrub_pages(vstart, 1 << order);
 
 	balloon_lock(flags);
-	ret = apply_to_page_range(&init_mm, vstart,
-				  PAGE_SIZE << order, dealloc_pte_fn, NULL);
-	BUG_ON(ret);
+	if (xen_feature(XENFEAT_auto_translated_physmap)) {
+		unsigned long gmfn = __pa(vstart) >> PAGE_SHIFT;
+		struct xen_memory_reservation reservation = {
+			.nr_extents   = 1,
+			.extent_order = order,
+			.domid        = DOMID_SELF
+		};
+		set_xen_guest_handle(reservation.extent_start, &gmfn);
+		ret = HYPERVISOR_memory_op(XENMEM_decrease_reservation,
+					   &reservation);
+		BUG_ON(ret != 1);
+	} else {
+		ret = apply_to_page_range(&init_mm, vstart, PAGE_SIZE << order,
+					  dealloc_pte_fn, NULL);
+		BUG_ON(ret);
+	}
 	current_pages -= 1UL << order;
 	totalram_pages = current_pages;
 	balloon_unlock(flags);