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migration: Split save_live_pending() into state_pending_*

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We split the function into to:

- state_pending_estimate: We estimate the remaining state size without
  stopping the machine.

- state pending_exact: We calculate the exact amount of remaining
  state.

The only "device" that implements different functions for _estimate()
and _exact() is ram.

Signed-off-by: Juan Quintela <quintela@redhat.com>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
This commit is contained in:
Juan Quintela 2022-10-03 02:00:03 +02:00
parent 255dc7af7e
commit c8df4a7aef
13 changed files with 143 additions and 76 deletions
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19
include/migration/register.h
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@ -46,11 +46,6 @@ typedef struct SaveVMHandlers {
/* This runs outside the iothread lock! */
int (*save_setup)(QEMUFile *f, void *opaque);
void (*save_live_pending)(void *opaque,
uint64_t threshold_size,
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
@ -61,8 +56,18 @@ typedef struct SaveVMHandlers {
* Sum of res_postcopy_only, res_compatible and res_postcopy_only is the
* whole amount of pending data.
*/
/* This estimates the remaining data to transfer */
void (*state_pending_estimate)(void *opaque,
uint64_t threshold_size,
uint64_t *res_precopy_only,
uint64_t *res_compatible,
uint64_t *res_postcopy_only);
/* This calculate the exact remaining data to transfer */
void (*state_pending_exact)(void *opaque,
uint64_t threshold_size,
uint64_t *res_precopy_only,
uint64_t *res_compatible,
uint64_t *res_postcopy_only);
LoadStateHandler *load_state;
int (*load_setup)(QEMUFile *f, void *opaque);
int (*load_cleanup)(void *opaque);