diff options
Diffstat (limited to 'migration/ram.c')
| -rw-r--r-- | migration/ram.c | 32 |
1 files changed, 18 insertions, 14 deletions
diff --git a/migration/ram.c b/migration/ram.c index 1cd98d6398..52dd678092 100644 --- a/migration/ram.c +++ b/migration/ram.c @@ -235,7 +235,7 @@ int64_t ramblock_recv_bitmap_send(QEMUFile *file, bitmap_to_le(le_bitmap, block->receivedmap, nbits); /* Size of the bitmap, in bytes */ - size = nbits / 8; + size = DIV_ROUND_UP(nbits, 8); /* * size is always aligned to 8 bytes for 64bit machines, but it @@ -1311,7 +1311,8 @@ bool multifd_recv_all_channels_created(void) return thread_count == atomic_read(&multifd_recv_state->count); } -void multifd_recv_new_channel(QIOChannel *ioc) +/* Return true if multifd is ready for the migration, otherwise false */ +bool multifd_recv_new_channel(QIOChannel *ioc) { MultiFDRecvParams *p; Error *local_err = NULL; @@ -1320,7 +1321,7 @@ void multifd_recv_new_channel(QIOChannel *ioc) id = multifd_recv_initial_packet(ioc, &local_err); if (id < 0) { multifd_recv_terminate_threads(local_err); - return; + return false; } p = &multifd_recv_state->params[id]; @@ -1328,7 +1329,7 @@ void multifd_recv_new_channel(QIOChannel *ioc) error_setg(&local_err, "multifd: received id '%d' already setup'", id); multifd_recv_terminate_threads(local_err); - return; + return false; } p->c = ioc; object_ref(OBJECT(ioc)); @@ -1339,9 +1340,7 @@ void multifd_recv_new_channel(QIOChannel *ioc) qemu_thread_create(&p->thread, p->name, multifd_recv_thread, p, QEMU_THREAD_JOINABLE); atomic_inc(&multifd_recv_state->count); - if (multifd_recv_state->count == migrate_multifd_channels()) { - migration_incoming_process(); - } + return multifd_recv_state->count == migrate_multifd_channels(); } /** @@ -3581,7 +3580,7 @@ static int ram_load_postcopy(QEMUFile *f) { int flags = 0, ret = 0; bool place_needed = false; - bool matching_page_sizes = false; + bool matches_target_page_size = false; MigrationIncomingState *mis = migration_incoming_get_current(); /* Temporary page that is later 'placed' */ void *postcopy_host_page = postcopy_get_tmp_page(mis); @@ -3621,7 +3620,7 @@ static int ram_load_postcopy(QEMUFile *f) ret = -EINVAL; break; } - matching_page_sizes = block->page_size == TARGET_PAGE_SIZE; + matches_target_page_size = block->page_size == TARGET_PAGE_SIZE; /* * Postcopy requires that we place whole host pages atomically; * these may be huge pages for RAMBlocks that are backed by @@ -3669,12 +3668,17 @@ static int ram_load_postcopy(QEMUFile *f) case RAM_SAVE_FLAG_PAGE: all_zero = false; - if (!place_needed || !matching_page_sizes) { + if (!matches_target_page_size) { + /* For huge pages, we always use temporary buffer */ qemu_get_buffer(f, page_buffer, TARGET_PAGE_SIZE); } else { - /* Avoids the qemu_file copy during postcopy, which is - * going to do a copy later; can only do it when we - * do this read in one go (matching page sizes) + /* + * For small pages that matches target page size, we + * avoid the qemu_file copy. Instead we directly use + * the buffer of QEMUFile to place the page. Note: we + * cannot do any QEMUFile operation before using that + * buffer to make sure the buffer is valid when + * placing the page. */ qemu_get_buffer_in_place(f, (uint8_t **)&place_source, TARGET_PAGE_SIZE); @@ -3940,7 +3944,7 @@ int ram_dirty_bitmap_reload(MigrationState *s, RAMBlock *block) int ret = -EINVAL; QEMUFile *file = s->rp_state.from_dst_file; unsigned long *le_bitmap, nbits = block->used_length >> TARGET_PAGE_BITS; - uint64_t local_size = nbits / 8; + uint64_t local_size = DIV_ROUND_UP(nbits, 8); uint64_t size, end_mark; trace_ram_dirty_bitmap_reload_begin(block->idstr); |