Hi David,
>
> Mark inflated and never onlined pages PG_offline, to tell the world that
> the content is stale and should not be dumped.
>
> 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: 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/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 211f3fe3a038..47719862e57f 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);
> @@ -1201,6 +1206,7 @@ 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);
Just thinking, do we need to care for clearing PageOffline flag before freeing
a balloon'd page?
Thanks,
Pankaj
> __free_page(pg);
> dm->num_pages_ballooned--;
> }
> @@ -1213,7 +1219,7 @@ 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)
> @@ -1245,6 +1251,10 @@ 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);
> --
> 2.17.2
>
>
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