From 93fbd0314ec060ffaf90169a06d5737fa97ffb25 Mon Sep 17 00:00:00 2001 From: "Dr. David Alan Gilbert" Date: Fri, 20 Oct 2017 10:05:50 +0100 Subject: [PATCH] migration: Add 'pause-before-switchover' capability 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 Reviewed-by: Peter Xu Reviewed-by: Juan Quintela Signed-off-by: Juan Quintela --- migration/migration.c | 10 ++++++++++ migration/migration.h | 1 + qapi/migration.json | 5 ++++- 3 files changed, 15 insertions(+), 1 deletion(-) diff --git a/migration/migration.c b/migration/migration.c index 3feffb5e26..c041ec7aed 100644 --- a/migration/migration.c +++ b/migration/migration.c @@ -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; diff --git a/migration/migration.h b/migration/migration.h index b83cceadc4..969866303e 100644 --- a/migration/migration.h +++ b/migration/migration.h @@ -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); diff --git a/qapi/migration.json b/qapi/migration.json index f8b365e3f5..4960231ba2 100644 --- a/qapi/migration.json +++ b/qapi/migration.json @@ -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: -- 2.11.4.GIT