From: David Hildenbrand <david@xxxxxxxxxx> Subject: xen/balloon: mark inflated pages PG_offline Mark inflated and never onlined pages PG_offline, to tell the world that the content is stale and should not be dumped. Link: http://lkml.kernel.org/r/20181119101616.8901-5-david@xxxxxxxxxx Signed-off-by: David Hildenbrand <david@xxxxxxxxxx> Reviewed-by: Juergen Gross <jgross@xxxxxxxx> Cc: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx> Cc: Stefano Stabellini <sstabellini@xxxxxxxxxx> Cc: Matthew Wilcox <willy@xxxxxxxxxxxxx> Cc: Michal Hocko <mhocko@xxxxxxxx> Cc: "Michael S. Tsirkin" <mst@xxxxxxxxxx> Cc: Alexander Duyck <alexander.h.duyck@xxxxxxxxxxxxxxx> Cc: Alexey Dobriyan <adobriyan@xxxxxxxxx> Cc: Arnd Bergmann <arnd@xxxxxxxx> Cc: Baoquan He <bhe@xxxxxxxxxx> Cc: Borislav Petkov <bp@xxxxxxxxx> Cc: Christian Hansen <chansen3@xxxxxxxxx> Cc: Dave Young <dyoung@xxxxxxxxxx> Cc: David Rientjes <rientjes@xxxxxxxxxx> Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> Cc: Haiyang Zhang <haiyangz@xxxxxxxxxxxxx> Cc: Jonathan Corbet <corbet@xxxxxxx> Cc: Julien Freche <jfreche@xxxxxxxxxx> Cc: Kairui Song <kasong@xxxxxxxxxx> Cc: Kazuhito Hagio <k-hagio@xxxxxxxxxxxxx> Cc: "Kirill A. Shutemov" <kirill.shutemov@xxxxxxxxxxxxxxx> Cc: Konstantin Khlebnikov <koct9i@xxxxxxxxx> Cc: "K. Y. Srinivasan" <kys@xxxxxxxxxxxxx> Cc: Len Brown <len.brown@xxxxxxxxx> Cc: Lianbo Jiang <lijiang@xxxxxxxxxx> Cc: Michal Hocko <mhocko@xxxxxxxxxx> Cc: Mike Rapoport <rppt@xxxxxxxxxxxxxxxxxx> Cc: Miles Chen <miles.chen@xxxxxxxxxxxx> Cc: Nadav Amit <namit@xxxxxxxxxx> Cc: Naoya Horiguchi <n-horiguchi@xxxxxxxxxxxxx> Cc: Omar Sandoval <osandov@xxxxxx> Cc: Pankaj gupta <pagupta@xxxxxxxxxx> Cc: Pavel Machek <pavel@xxxxxx> Cc: Pavel Tatashin <pasha.tatashin@xxxxxxxxxx> Cc: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx> Cc: "Rafael J. Wysocki" <rjw@xxxxxxxxxxxxx> Cc: Stephen Hemminger <sthemmin@xxxxxxxxxxxxx> Cc: Stephen Rothwell <sfr@xxxxxxxxxxxxxxxx> Cc: Vitaly Kuznetsov <vkuznets@xxxxxxxxxx> Cc: Vlastimil Babka <vbabka@xxxxxxx> Cc: Xavier Deguillard <xdeguillard@xxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- drivers/xen/balloon.c | 3 +++ 1 file changed, 3 insertions(+) --- a/drivers/xen/balloon.c~xen-balloon-mark-inflated-pages-pg_offline +++ a/drivers/xen/balloon.c @@ -380,6 +380,7 @@ static void xen_online_page(struct page 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); @@ -446,6 +447,7 @@ static enum bp_state increase_reservatio xenmem_reservation_va_mapping_update(1, &page, &frame_list[i]); /* Relinquish the page back to the allocator. */ + __ClearPageOffline(page); free_reserved_page(page); } @@ -472,6 +474,7 @@ static enum bp_state decrease_reservatio state = BP_EAGAIN; break; } + __SetPageOffline(page); adjust_managed_page_count(page, -1); xenmem_reservation_scrub_page(page); list_add(&page->lru, &pages); _
