[libvirt PATCH 00/80] Add support for post-copy recovery

[Pavel Hrdina]

On Tue, May 10, 2022 at 05:20:21PM +0200, Jiri Denemark wrote:
> This series implements a new VIR_MIGRATE_POSTCOPY_RESUME flag (virsh
> migrate --resume) for recovering from a failed post-copy migration.
> 
> You can also fetch the series from my gitlab fork:
> 
>     git fetch https://gitlab.com/jirkade/libvirt.git post-copy-recovery
> 
> Jiri Denemark (80):
>   qemu: Add debug messages to job recovery code
>   qemumonitorjsontest: Test more migration capabilities
>   qemu: Return state from qemuMonitorGetMigrationCapabilities
>   qemu: Enable migration events only when disabled
>   Introduce VIR_DOMAIN_RUNNING_POSTCOPY_FAILED
>   qemu: Keep domain running on dst on failed post-copy migration
>   qemu: Explicitly emit events on post-copy failure
>   qemu: Make qemuDomainCleanupAdd return void
>   conf: Introduce virDomainObjIsFailedPostcopy helper
>   conf: Introduce virDomainObjIsPostcopy helper
>   qemu: Introduce qemuProcessCleanupMigrationJob
>   qemu: Rename qemuDomainObjRestoreJob as qemuDomainObjPreserveJob
>   qemu: Add qemuDomainObjRestoreAsyncJob
>   qemu: Keep migration job active after failed post-copy
>   qemu: Abort failed post-copy when we haven't called Finish yet
>   qemu: Restore failed migration job on reconnect
>   qemu: Restore async job start timestamp on reconnect
>   qemu: Drop forward declarations in migration code
>   qemu: Don't wait for migration job when migration is running
>   qemu: Use switch in qemuDomainGetJobInfoMigrationStats
>   qemu: Fetch paused migration stats
>   qemu: Handle 'postcopy-paused' migration state
>   qemu: Add support for postcopy-recover QEMU migration state
>   qemu: Create domain object at the end of qemuMigrationDstFinish
>   qemu: Move success-only code out of endjob in qemuMigrationDstFinish
>   qemu: Separate success and failure path in qemuMigrationDstFinish
>   qemu: Rename "endjob" label in qemuMigrationDstFinish
>   qemu: Generate migration cookie in Finish phase earlier
>   qemu: Make final part of migration Finish phase reusable
>   qemu: Drop obsolete comment in qemuMigrationDstFinish
>   qemu: Preserve error in qemuMigrationDstFinish
>   qemu: Introduce qemuMigrationDstFinishFresh
>   qemu: Introduce qemuMigrationDstFinishOffline
>   qemu: Separate cookie parsing for qemuMigrationDstFinishOffline
>   qemu: Introduce qemuMigrationDstFinishActive
>   qemu: Handle migration job in qemuMigrationDstFinish
>   qemu: Make final part of migration Confirm phase reusable
>   qemu: Make sure migrationPort is released even in callbacks
>   qemu: Pass qemuDomainJobObj to qemuMigrationDstComplete
>   qemu: Finish completed unattended migration
>   qemu: Ignore missing memory statistics in query-migrate
>   qemu: Improve post-copy migration handling on reconnect
>   qemu: Check flags incompatible with offline migration earlier
>   qemu: Introduce qemuMigrationSrcBeginXML helper
>   qemu: Add new migration phases for post-copy recovery
>   qemu: Separate protocol checks from qemuMigrationJobSetPhase
>   qemu: Make qemuMigrationCheckPhase failure fatal
>   qemu: Refactor qemuDomainObjSetJobPhase
>   qemu: Do not set job owner in qemuMigrationJobSetPhase
>   qemu: Use QEMU_MIGRATION_PHASE_POSTCOPY_FAILED
>   Introduce VIR_MIGRATE_POSTCOPY_RESUME flag
>   virsh: Add --postcopy-resume option for migrate command
>   qemu: Don't set VIR_MIGRATE_PAUSED for post-copy resume
>   qemu: Implement VIR_MIGRATE_POSTCOPY_RESUME for Begin phase
>   qmeu: Refactor qemuMigrationSrcPerformPhase
>   qemu: Separate starting migration from qemuMigrationSrcRun
>   qemu: Add support for 'resume' parameter of migrate QMP command
>   qemu: Implement VIR_MIGRATE_POSTCOPY_RESUME for Perform phase
>   qemu: Implement VIR_MIGRATE_POSTCOPY_RESUME for Confirm phase
>   qemu: Introduce qemuMigrationDstPrepareFresh
>   qemu: Refactor qemuMigrationDstPrepareFresh
>   qemu: Simplify cleanup in qemuMigrationDstPrepareFresh
>   qemu: Add support for migrate-recover QMP command
>   qemu: Rename qemuMigrationSrcCleanup
>   qemu: Refactor qemuMigrationAnyConnectionClosed
>   qemu: Handle incoming migration in qemuMigrationAnyConnectionClosed
>   qemu: Start a migration phase in qemuMigrationAnyConnectionClosed
>   qemu: Implement VIR_MIGRATE_POSTCOPY_RESUME for Prepare phase
>   qemu: Implement VIR_MIGRATE_POSTCOPY_RESUME for Finish phase
>   qemu: Create completed jobData in qemuMigrationSrcComplete
>   qemu: Register qemuProcessCleanupMigrationJob after Begin phase
>   qemu: Call qemuDomainCleanupAdd from qemuMigrationJobContinue
>   qemu: Implement VIR_MIGRATE_POSTCOPY_RESUME for peer-to-peer migration
>   qemu: Enable support for VIR_MIGRATE_POSTCOPY_RESUME
>   Add virDomainAbortJobFlags public API
>   qemu: Implement virDomainAbortJobFlags
>   Add VIR_DOMAIN_ABORT_JOB_POSTCOPY flag for virDomainAbortJobFlags
>   qemu: Implement VIR_DOMAIN_ABORT_JOB_POSTCOPY flag
>   virsh: Add --postcopy option for domjobabort command
>   NEWS: Add support for post-copy recovery

For the patches with simple fixes or once the questions asked by Peter
are resolved. But there will be v2 to handle pausing/keeping VM running
on dst for failed post-copy migration.

Reviewed-by: Pavel Hrdina <phrdina at redhat.com>
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