diff options
| -rw-r--r-- | migration/ram.c | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/migration/ram.c b/migration/ram.c index 1eb155aedd..0490f005dd 100644 --- a/migration/ram.c +++ b/migration/ram.c @@ -716,6 +716,9 @@ static int save_zero_page(QEMUFile *f, RAMBlock *block, ram_addr_t offset, * ram_save_page: Send the given page to the stream * * Returns: Number of pages written. + * < 0 - error + * >=0 - Number of pages written - this might legally be 0 + * if xbzrle noticed the page was the same. * * @f: QEMUFile where to send the data * @block: block that contains the page we want to send @@ -1249,7 +1252,13 @@ static int ram_save_target_page(MigrationState *ms, QEMUFile *f, if (unsentmap) { clear_bit(dirty_ram_abs >> TARGET_PAGE_BITS, unsentmap); } - last_sent_block = block; + /* Only update last_sent_block if a block was actually sent; xbzrle + * might have decided the page was identical so didn't bother writing + * to the stream. + */ + if (res > 0) { + last_sent_block = block; + } } return res; |