[Xen-devel] [PATCH RFC 4/6] xen/balloon: mark inflated pages PG_offline

[David Hildenbrand <david@xxxxxxxxxx>]

Mark inflated and never onlined pages PG_offline, to tell the world that
the content is stale and should not be dumped.

Cc: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>
Cc: Juergen Gross <jgross@xxxxxxxx>
Cc: Stefano Stabellini <sstabellini@xxxxxxxxxx>
Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Cc: Matthew Wilcox <willy@xxxxxxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxx>
Cc: "Michael S. Tsirkin" <mst@xxxxxxxxxx>
Signed-off-by: David Hildenbrand <david@xxxxxxxxxx>
---
 drivers/xen/balloon.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/xen/balloon.c b/drivers/xen/balloon.c
index 12148289debd..14dd6b814db3 100644
--- a/drivers/xen/balloon.c
+++ b/drivers/xen/balloon.c
@@ -425,6 +425,7 @@ static int xen_bring_pgs_online(struct page *pg, unsigned 
int order)
        for (i = 0; i < size; i++) {
                p = pfn_to_page(start_pfn + i);
                __online_page_set_limits(p);
+               __SetPageOffline(p);
                __balloon_append(p);
        }
        mutex_unlock(&balloon_mutex);
@@ -493,6 +494,7 @@ static enum bp_state increase_reservation(unsigned long 
nr_pages)
                xenmem_reservation_va_mapping_update(1, &page, &frame_list[i]);
 
                /* Relinquish the page back to the allocator. */
+               __ClearPageOffline(page);
                free_reserved_page(page);
        }
 
@@ -519,6 +521,7 @@ static enum bp_state decrease_reservation(unsigned long 
nr_pages, gfp_t gfp)
                        state = BP_EAGAIN;
                        break;
                }
+               __SetPageOffline(page);
                adjust_managed_page_count(page, -1);
                xenmem_reservation_scrub_page(page);
                list_add(&page->lru, &pages);
-- 
2.17.2


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