From fae42c4d522b9b9c9de21a5cade162f2e7eaf644 Mon Sep 17 00:00:00 2001 From: David Hildenbrand Date: Tue, 5 Mar 2019 15:42:36 -0800 Subject: [PATCH] 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@redhat.com Signed-off-by: David Hildenbrand Acked-by: Pankaj gupta Cc: "K. Y. Srinivasan" Cc: Haiyang Zhang Cc: Stephen Hemminger Cc: Kairui Song Cc: Vitaly Kuznetsov Cc: Matthew Wilcox Cc: Michal Hocko Cc: "Michael S. Tsirkin" Cc: Alexander Duyck Cc: Alexey Dobriyan Cc: Arnd Bergmann Cc: Baoquan He Cc: Borislav Petkov Cc: Boris Ostrovsky Cc: Christian Hansen Cc: Dave Young Cc: David Rientjes Cc: Greg Kroah-Hartman Cc: Jonathan Corbet Cc: Juergen Gross Cc: Julien Freche Cc: Kazuhito Hagio Cc: "Kirill A. Shutemov" Cc: Konstantin Khlebnikov Cc: Len Brown Cc: Lianbo Jiang Cc: Michal Hocko Cc: Mike Rapoport Cc: Miles Chen Cc: Nadav Amit Cc: Naoya Horiguchi Cc: Omar Sandoval Cc: Pavel Machek Cc: Pavel Tatashin Cc: Rafael J. Wysocki Cc: "Rafael J. Wysocki" Cc: Stefano Stabellini Cc: Stephen Rothwell Cc: Vlastimil Babka Cc: Xavier Deguillard Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- drivers/hv/hv_balloon.c | 14 ++++++++++++-- 1 file changed, 12 insertions(+), 2 deletions(-) diff --git a/drivers/hv/hv_balloon.c b/drivers/hv/hv_balloon.c index a50b7624b2a3..dd475f3bcc8a 100644 --- a/drivers/hv/hv_balloon.c +++ b/drivers/hv/hv_balloon.c @@ -681,8 +681,13 @@ static struct notifier_block hv_memory_nb = { /* 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_dynmem_device *dm, 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 hv_dynmem_device *dm, 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(struct hv_dynmem_device *dm, 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);