From: David Hildenbrand <david@xxxxxxxxxx> Subject: hv_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/20181119101616.8901-6-david@xxxxxxxxxx Signed-off-by: David Hildenbrand <david@xxxxxxxxxx> Acked-by: Pankaj gupta <pagupta@xxxxxxxxxx> Cc: "K. Y. Srinivasan" <kys@xxxxxxxxxxxxx> Cc: Haiyang Zhang <haiyangz@xxxxxxxxxxxxx> Cc: Stephen Hemminger <sthemmin@xxxxxxxxxxxxx> Cc: Kairui Song <kasong@xxxxxxxxxx> Cc: Vitaly Kuznetsov <vkuznets@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: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx> Cc: Christian Hansen <chansen3@xxxxxxxxx> Cc: Dave Young <dyoung@xxxxxxxxxx> Cc: David Rientjes <rientjes@xxxxxxxxxx> Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> Cc: Jonathan Corbet <corbet@xxxxxxx> Cc: Juergen Gross <jgross@xxxxxxxx> Cc: Julien Freche <jfreche@xxxxxxxxxx> Cc: Kazuhito Hagio <k-hagio@xxxxxxxxxxxxx> Cc: "Kirill A. Shutemov" <kirill.shutemov@xxxxxxxxxxxxxxx> Cc: Konstantin Khlebnikov <koct9i@xxxxxxxxx> 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: 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: Stefano Stabellini <sstabellini@xxxxxxxxxx> Cc: Stephen Rothwell <sfr@xxxxxxxxxxxxxxxx> Cc: Vlastimil Babka <vbabka@xxxxxxx> Cc: Xavier Deguillard <xdeguillard@xxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- drivers/hv/hv_balloon.c | 14 ++++++++++++-- 1 file changed, 12 insertions(+), 2 deletions(-) --- a/drivers/hv/hv_balloon.c~hv_balloon-mark-inflated-pages-pg_offline +++ a/drivers/hv/hv_balloon.c @@ -681,8 +681,13 @@ static struct notifier_block hv_memory_n /* Check if the particular page is backed and can be onlined and online it. */ static void hv_page_online_one(struct hv_hotadd_state *has, struct page *pg) { - if (!has_pfn_is_backed(has, page_to_pfn(pg))) + if (!has_pfn_is_backed(has, page_to_pfn(pg))) { + if (!PageOffline(pg)) + __SetPageOffline(pg); return; + } + if (PageOffline(pg)) + __ClearPageOffline(pg); /* This frame is currently backed; online the page. */ __online_page_set_limits(pg); @@ -1202,6 +1207,7 @@ static void free_balloon_pages(struct hv for (i = 0; i < num_pages; i++) { pg = pfn_to_page(i + start_frame); + __ClearPageOffline(pg); __free_page(pg); dm->num_pages_ballooned--; } @@ -1214,7 +1220,7 @@ static unsigned int alloc_balloon_pages( struct dm_balloon_response *bl_resp, int alloc_unit) { - unsigned int i = 0; + unsigned int i, j; struct page *pg; if (num_pages < alloc_unit) @@ -1246,6 +1252,10 @@ static unsigned int alloc_balloon_pages( if (alloc_unit != 1) split_page(pg, get_order(alloc_unit << PAGE_SHIFT)); + /* mark all pages offline */ + for (j = 0; j < (1 << get_order(alloc_unit << PAGE_SHIFT)); j++) + __SetPageOffline(pg + j); + bl_resp->range_count++; bl_resp->range_array[i].finfo.start_page = page_to_pfn(pg); _
