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From 13a626395dc1a35e7a7ab0a501a83c5647e3267a Mon Sep 17 00:00:00 2001
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From: "Dr. David Alan Gilbert" <dgilbert@redhat.com>
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Date: Wed, 25 Oct 2017 18:28:32 +0200
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Subject: [PATCH 13/19] migration: Add 'pause-before-switchover' capability
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RH-Author: Dr. David Alan Gilbert <dgilbert@redhat.com>
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Message-id: <20171025182838.31829-2-dgilbert@redhat.com>
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Patchwork-id: 77435
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O-Subject: [RHV-7.5 qemu-kvm-rhev PATCH 1/7] migration: Add 'pause-before-switchover' capability
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Bugzilla: 1497120
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RH-Acked-by: Peter Xu <peterx@redhat.com>
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RH-Acked-by: Juan Quintela <quintela@redhat.com>
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RH-Acked-by: Miroslav Rezanina <mrezanin@redhat.com>
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From: "Dr. David Alan Gilbert" <dgilbert@redhat.com>
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When 'pause-before-switchover' is enabled, the outgoing migration
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will pause before invalidating the block devices and serializing
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the device state.
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At this point the management layer gets the chance to clean up any
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device jobs or other device users before the migration completes.
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Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
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Reviewed-by: Peter Xu <peterx@redhat.com>
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Reviewed-by: Juan Quintela <quintela@redhat.com>
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Signed-off-by: Juan Quintela <quintela@redhat.com>
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(cherry picked from commit 93fbd0314ec060ffaf90169a06d5737fa97ffb25)
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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Conflicts:
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migration/migration.c
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migration/migration.h
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Differences with other flags added
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qapi/migration.json
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Still in qapi-schema.json for us
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---
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migration/migration.c | 10 ++++++++++
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migration/migration.h | 1 +
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qapi-schema.json | 5 ++++-
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3 files changed, 15 insertions(+), 1 deletion(-)
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diff --git a/migration/migration.c b/migration/migration.c
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index c7b4d3d..d4356a4 100644
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--- a/migration/migration.c
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+++ b/migration/migration.c
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@@ -1426,6 +1426,16 @@ bool migrate_use_events(void)
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return s->enabled_capabilities[MIGRATION_CAPABILITY_EVENTS];
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}
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+bool migrate_pause_before_switchover(void)
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+{
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+ MigrationState *s;
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+
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+ s = migrate_get_current();
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+
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+ return s->enabled_capabilities[
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+ MIGRATION_CAPABILITY_PAUSE_BEFORE_SWITCHOVER];
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+}
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+
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int migrate_use_xbzrle(void)
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{
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MigrationState *s;
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diff --git a/migration/migration.h b/migration/migration.h
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index 8771ab0..2eebad8 100644
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--- a/migration/migration.h
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+++ b/migration/migration.h
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@@ -170,6 +170,7 @@ bool migrate_postcopy_ram(void);
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bool migrate_zero_blocks(void);
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bool migrate_auto_converge(void);
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+bool migrate_pause_before_switchover(void);
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int migrate_use_xbzrle(void);
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int64_t migrate_xbzrle_cache_size(void);
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diff --git a/qapi-schema.json b/qapi-schema.json
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index 0591d9d..9b9ec9a 100644
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--- a/qapi-schema.json
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+++ b/qapi-schema.json
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@@ -919,12 +919,15 @@
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# @return-path: If enabled, migration will use the return path even
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# for precopy. (since 2.10)
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#
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+# @pause-before-switchover: Pause outgoing migration before serialising device
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+# state and before disabling block IO (since 2.11)
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+#
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# Since: 1.2
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##
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{ 'enum': 'MigrationCapability',
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'data': ['xbzrle', 'rdma-pin-all', 'auto-converge', 'zero-blocks',
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'compress', 'events', 'postcopy-ram', 'x-colo', 'release-ram',
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- 'block', 'return-path' ] }
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+ 'block', 'return-path', 'pause-before-switchover' ] }
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##
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# @MigrationCapabilityStatus:
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--
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1.8.3.1
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