[01/18] migration: add has_postcopy savevm handler
diff mbox

Message ID 1471343175-14945-2-git-send-email-vsementsov@virtuozzo.com
State New
Headers show

Commit Message

Vladimir Sementsov-Ogievskiy Aug. 16, 2016, 10:25 a.m. UTC
Now postcopy-able states are recognized by not NULL
save_live_complete_postcopy handler. But when we have several different
postcopy-able states, it is not convenient. Ram postcopy may be
disabled, while some other postcopy enabled, in this case Ram state
should behave as it is not postcopy-able.

This patch add separate has_postcopy handler to specify behaviour of
savevm state.

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
---
 include/migration/vmstate.h | 1 +
 migration/ram.c             | 6 ++++++
 migration/savevm.c          | 6 ++++--
 3 files changed, 11 insertions(+), 2 deletions(-)

Comments

Juan Quintela Nov. 4, 2016, 12:32 p.m. UTC | #1
Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com> wrote:
> Now postcopy-able states are recognized by not NULL
> save_live_complete_postcopy handler. But when we have several different
> postcopy-able states, it is not convenient. Ram postcopy may be
> disabled, while some other postcopy enabled, in this case Ram state
> should behave as it is not postcopy-able.
>
> This patch add separate has_postcopy handler to specify behaviour of
> savevm state.
>
> Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>

Reviewed-by: Juan Quintela <quintela@redhat.com>

Patch
diff mbox

diff --git a/include/migration/vmstate.h b/include/migration/vmstate.h
index 1638ee5..5c30ef7 100644
--- a/include/migration/vmstate.h
+++ b/include/migration/vmstate.h
@@ -46,6 +46,7 @@  typedef struct SaveVMHandlers {
 
     /* This runs both outside and inside the iothread lock.  */
     bool (*is_active)(void *opaque);
+    bool (*has_postcopy)(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
diff --git a/migration/ram.c b/migration/ram.c
index 815bc0e..fa5c72b 100644
--- a/migration/ram.c
+++ b/migration/ram.c
@@ -2578,10 +2578,16 @@  static int ram_load(QEMUFile *f, void *opaque, int version_id)
     return ret;
 }
 
+static bool ram_has_postcopy(void *opaque)
+{
+    return migrate_postcopy_ram();
+}
+
 static SaveVMHandlers savevm_ram_handlers = {
     .save_live_setup = ram_save_setup,
     .save_live_iterate = ram_save_iterate,
     .save_live_complete_postcopy = ram_save_complete,
+    .has_postcopy = ram_has_postcopy,
     .save_live_complete_precopy = ram_save_complete,
     .save_live_pending = ram_save_pending,
     .load_state = ram_load,
diff --git a/migration/savevm.c b/migration/savevm.c
index 33a2911..d2efeeb 100644
--- a/migration/savevm.c
+++ b/migration/savevm.c
@@ -940,7 +940,8 @@  int qemu_savevm_state_iterate(QEMUFile *f, bool postcopy)
          * call that's already run, it might get confused if we call
          * iterate afterwards.
          */
-        if (postcopy && !se->ops->save_live_complete_postcopy) {
+        if (postcopy &&
+            !(se->ops->has_postcopy && se->ops->has_postcopy(se->opaque))) {
             continue;
         }
         if (qemu_file_rate_limit(f)) {
@@ -1028,7 +1029,8 @@  void qemu_savevm_state_complete_precopy(QEMUFile *f, bool iterable_only)
 
     QTAILQ_FOREACH(se, &savevm_state.handlers, entry) {
         if (!se->ops ||
-            (in_postcopy && se->ops->save_live_complete_postcopy) ||
+            (in_postcopy && se->ops->has_postcopy &&
+             se->ops->has_postcopy(se->opaque)) ||
             (in_postcopy && !iterable_only) ||
             !se->ops->save_live_complete_precopy) {
             continue;