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migration: introduce 'background-snapshot' migration capability

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Add new capability to 'qapi/migration.json' schema.
Update migrate_caps_check() to validate enabled capability set
against introduced one. Perform checks for required kernel features
and compatibility with guest memory backends.

Signed-off-by: Andrey Gruzdev <andrey.gruzdev@virtuozzo.com>
Reviewed-by: Peter Xu <peterx@redhat.com>
Acked-by: Markus Armbruster <armbru@redhat.com>
Message-Id: <20210129101407.103458-2-andrey.gruzdev@virtuozzo.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
This commit is contained in:
Andrey Gruzdev 2021-01-29 13:14:03 +03:00 • committed by Dr. David Alan Gilbert
parent 1dfafcbd39
commit 6e8c25b4c6
5 changed files with 134 additions and 1 deletions
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7
qapi/migration.json
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@ -442,6 +442,11 @@
# @validate-uuid: Send the UUID of the source to allow the destination
# to ensure it is the same. (since 4.2)
#
# @background-snapshot: If enabled, the migration stream will be a snapshot
# of the VM exactly at the point when the migration
# procedure starts. The VM RAM is saved with running VM.
# (since 6.0)
#
# Since: 1.2
##
{ 'enum': 'MigrationCapability',
@ -449,7 +454,7 @@
'compress', 'events', 'postcopy-ram', 'x-colo', 'release-ram',
'block', 'return-path', 'pause-before-switchover', 'multifd',
'dirty-bitmaps', 'postcopy-blocktime', 'late-block-activate',
'x-ignore-shared', 'validate-uuid' ] }
'x-ignore-shared', 'validate-uuid', 'background-snapshot'] }
##
# @MigrationCapabilityStatus: