diff options
| -rw-r--r-- | drivers/hv/hv_balloon.c | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/drivers/hv/hv_balloon.c b/drivers/hv/hv_balloon.c index 014256a..99afef9 100644 --- a/drivers/hv/hv_balloon.c +++ b/drivers/hv/hv_balloon.c @@ -778,7 +778,17 @@ static unsigned long handle_pg_range(unsigned long pg_start, pgs_ol = has->ha_end_pfn - start_pfn; if (pgs_ol > pfn_cnt) pgs_ol = pfn_cnt; - hv_bring_pgs_online(start_pfn, pgs_ol); + + /* + * Check if the corresponding memory block is already + * online by checking its last previously backed page. + * In case it is we need to bring rest (which was not + * backed previously) online too. + */ + if (start_pfn > has->start_pfn && + !PageReserved(pfn_to_page(start_pfn - 1))) + hv_bring_pgs_online(start_pfn, pgs_ol); + has->covered_end_pfn += pgs_ol; pfn_cnt -= pgs_ol; } |