From c865d84872b421715d8291285f57b658e8b39c9b Mon Sep 17 00:00:00 2001 From: Vladimir Sementsov-Ogievskiy Date: Tue, 13 Mar 2018 15:34:01 -0400 Subject: migration: add is_active_iterate handler Only-postcopy savevm states (dirty-bitmap) don't need live iteration, so to disable them and stop transporting empty sections there is a new savevm handler. Signed-off-by: Vladimir Sementsov-Ogievskiy Reviewed-by: Juan Quintela Reviewed-by: John Snow Reviewed-by: Fam Zheng Message-id: 20180313180320.339796-10-vsementsov@virtuozzo.com --- include/migration/register.h | 9 +++++++++ migration/savevm.c | 5 +++++ 2 files changed, 14 insertions(+) diff --git a/include/migration/register.h b/include/migration/register.h index 9436a87678..f6f12f9b1a 100644 --- a/include/migration/register.h +++ b/include/migration/register.h @@ -26,6 +26,15 @@ typedef struct SaveVMHandlers { bool (*is_active)(void *opaque); bool (*has_postcopy)(void *opaque); + /* is_active_iterate + * If it is not NULL then qemu_savevm_state_iterate will skip iteration if + * it returns false. For example, it is needed for only-postcopy-states, + * which needs to be handled by qemu_savevm_state_setup and + * qemu_savevm_state_pending, but do not need iterations until not in + * postcopy stage. + */ + bool (*is_active_iterate)(void *opaque); + /* This runs outside the iothread lock in the migration case, and * within the lock in the savevm case. The callback had better only * use data that is local to the migration thread or protected diff --git a/migration/savevm.c b/migration/savevm.c index cd5944b81f..a60819ec2e 100644 --- a/migration/savevm.c +++ b/migration/savevm.c @@ -1028,6 +1028,11 @@ int qemu_savevm_state_iterate(QEMUFile *f, bool postcopy) continue; } } + if (se->ops && se->ops->is_active_iterate) { + if (!se->ops->is_active_iterate(se->opaque)) { + continue; + } + } /* * In the postcopy phase, any device that doesn't know how to * do postcopy should have saved it's state in the _complete -- cgit v1.2.3