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[Qemu-devel] [PULL 06/21] migration: Add 'pause-before-switchover' capab
From: |
Juan Quintela |
Subject: |
[Qemu-devel] [PULL 06/21] migration: Add 'pause-before-switchover' capability |
Date: |
Mon, 23 Oct 2017 18:07:45 +0200 |
From: "Dr. David Alan Gilbert" <address@hidden>
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 <address@hidden>
Reviewed-by: Peter Xu <address@hidden>
Reviewed-by: Juan Quintela <address@hidden>
Signed-off-by: Juan Quintela <address@hidden>
---
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:
--
2.13.6
- [Qemu-devel] [PULL 00/21] Migration pull request, Juan Quintela, 2017/10/23
- [Qemu-devel] [PULL 01/21] migration: Fix migrate_test_apply for multifd parameters, Juan Quintela, 2017/10/23
- [Qemu-devel] [PULL 03/21] migration: Make cache size elements use the right types, Juan Quintela, 2017/10/23
- [Qemu-devel] [PULL 04/21] migration: Move xbzrle cache resize error handling to xbzrle_cache_resize, Juan Quintela, 2017/10/23
- [Qemu-devel] [PULL 02/21] migratiom: Remove max_item_age parameter, Juan Quintela, 2017/10/23
- [Qemu-devel] [PULL 05/21] migration: Make cache_init() take an error parameter, Juan Quintela, 2017/10/23
- [Qemu-devel] [PULL 06/21] migration: Add 'pause-before-switchover' capability,
Juan Quintela <=
- [Qemu-devel] [PULL 08/21] migration: Wait for semaphore before completing migration, Juan Quintela, 2017/10/23
- [Qemu-devel] [PULL 09/21] migration: migrate-continue, Juan Quintela, 2017/10/23
- [Qemu-devel] [PULL 10/21] migrate: HMP migate_continue, Juan Quintela, 2017/10/23
- [Qemu-devel] [PULL 07/21] migration: Add 'pre-switchover' and 'device' statuses, Juan Quintela, 2017/10/23
- [Qemu-devel] [PULL 11/21] migration: allow cancel to unpause, Juan Quintela, 2017/10/23
- [Qemu-devel] [PULL 12/21] migration: pause-before-switchover for postcopy, Juan Quintela, 2017/10/23
- [Qemu-devel] [PULL 13/21] migration: provide ram_state_init(), Juan Quintela, 2017/10/23
- [Qemu-devel] [PULL 14/21] migration: provide ram_state_cleanup, Juan Quintela, 2017/10/23
- [Qemu-devel] [PULL 15/21] migration: clean up xbzrle cache init/destroy, Juan Quintela, 2017/10/23
- [Qemu-devel] [PULL 16/21] migration: new ram_init_bitmaps(), Juan Quintela, 2017/10/23