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migration: Add 'pause-before-switchover' capability

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When 'pause-before-switchover' is enabled, the outgoing migration
will pause before invalidating the block devices and serializing
the device state.
At this point the management layer gets the chance to clean up any
device jobs or other device users before the migration completes.

Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Reviewed-by: Peter Xu <peterx@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
This commit is contained in:
Dr. David Alan Gilbert 2017-10-20 10:05:50 +01:00 committed by Juan Quintela
parent 80f8dfde97
commit 93fbd0314e
3 changed files with 15 additions and 1 deletions
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10
migration/migration.c
View File

@ -1511,6 +1511,16 @@ bool migrate_use_multifd(void)
return s->enabled_capabilities[MIGRATION_CAPABILITY_X_MULTIFD];
}
bool migrate_pause_before_switchover(void)
{
MigrationState *s;
s = migrate_get_current();
return s->enabled_capabilities[
MIGRATION_CAPABILITY_PAUSE_BEFORE_SWITCHOVER];
}
int migrate_multifd_channels(void)
{
MigrationState *s;

1
migration/migration.h
View File

@ -177,6 +177,7 @@ bool migrate_zero_blocks(void);
bool migrate_auto_converge(void);
bool migrate_use_multifd(void);
bool migrate_pause_before_switchover(void);
int migrate_multifd_channels(void);
int migrate_multifd_page_count(void);

5
qapi/migration.json
View File

@ -341,6 +341,9 @@
# @return-path: If enabled, migration will use the return path even
# for precopy. (since 2.10)
#
# @pause-before-switchover: Pause outgoing migration before serialising device
# state and before disabling block IO (since 2.11)
#
# @x-multifd: Use more than one fd for migration (since 2.11)
#
# Since: 1.2
@ -348,7 +351,7 @@
{ 'enum': 'MigrationCapability',
'data': ['xbzrle', 'rdma-pin-all', 'auto-converge', 'zero-blocks',
'compress', 'events', 'postcopy-ram', 'x-colo', 'release-ram',
'block', 'return-path', 'x-multifd' ] }
'block', 'return-path', 'pause-before-switchover', 'x-multifd' ] }
##
# @MigrationCapabilityStatus: