[Xen-changelog] Balloon driver: when in autotranslate mode, pages are returned

[Xen patchbot -unstable <patchbot-unstable@xxxxxxxxxxxxxxxxxxx>]

# HG changeset patch
# User kaf24@xxxxxxxxxxxxxxxxxxxx
# Node ID ce48ea86ad72bc8d67214450c5052a3986ff55a9
# Parent  3e5a203c548982a7fdca77aa78ce837a8329f5c4
Balloon driver: when in autotranslate mode, pages are returned
to xen without traversing init_mm.
This change is needed for xen/ia64 vp model.

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

diff -r 3e5a203c5489 -r ce48ea86ad72 
linux-2.6-xen-sparse/drivers/xen/balloon/balloon.c
--- a/linux-2.6-xen-sparse/drivers/xen/balloon/balloon.c        Sun Apr 30 
09:39:04 2006 +0100
+++ b/linux-2.6-xen-sparse/drivers/xen/balloon/balloon.c        Sun Apr 30 
09:47:51 2006 +0100
@@ -550,9 +550,22 @@ 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);

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