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migration: add has_postcopy savevm handler 

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>
Signed-off-by: Juan Quintela <quintela@redhat.com>
This commit is contained in:
Vladimir Sementsov-Ogievskiy 2017-07-10 19:30:14 +03:00 committed by Juan Quintela
parent d7788151a0
commit c646762736
3 changed files with 11 additions and 2 deletions
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1
include/migration/register.h
View File

@ -24,6 +24,7 @@ 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

6
migration/ram.c
View File

@ -2849,11 +2849,17 @@ 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_setup = ram_save_setup,
.save_live_iterate = ram_save_iterate,
.save_live_complete_postcopy = ram_save_complete,
.save_live_complete_precopy = ram_save_complete,
.has_postcopy = ram_has_postcopy,
.save_live_pending = ram_save_pending,
.load_state = ram_load,
.save_cleanup = ram_save_cleanup,

6
migration/savevm.c
View File

@ -1008,7 +1008,8 @@ 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)) {
@ -1097,7 +1098,8 @@ int 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;