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migration: introduce postcopy-only pending

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There would be savevm states (dirty-bitmap) which can migrate only in
postcopy stage. The corresponding pending is introduced here.

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Message-id: 20180313180320.339796-6-vsementsov@virtuozzo.com
This commit is contained in:
Vladimir Sementsov-Ogievskiy 2018-03-13 15:34:00 -04:00 • committed by John Snow
parent 4f43e9535b
commit 4799502640
8 changed files with 46 additions and 26 deletions
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17
include/migration/register.h
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@ -37,8 +37,21 @@ typedef struct SaveVMHandlers {
int (*save_setup)(QEMUFile *f, void *opaque);
void (*save_live_pending)(QEMUFile *f, void *opaque,
uint64_t threshold_size,
uint64_t *non_postcopiable_pending,
uint64_t *postcopiable_pending);
uint64_t *res_precopy_only,
uint64_t *res_compatible,
uint64_t *res_postcopy_only);
/* Note for save_live_pending:
* - res_precopy_only is for data which must be migrated in precopy phase
* or in stopped state, in other words - before target vm start
* - res_compatible is for data which may be migrated in any phase
* - res_postcopy_only is for data which must be migrated in postcopy phase
* or in stopped state, in other words - after source vm stop
*
* Sum of res_postcopy_only, res_compatible and res_postcopy_only is the
* whole amount of pending data.
*/
LoadStateHandler *load_state;
int (*load_setup)(QEMUFile *f, void *opaque);
int (*load_cleanup)(void *opaque);