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migration: Add MIG_CMD_SWITCHOVER_START and its load handler

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This QEMU_VM_COMMAND sub-command and its switchover_start SaveVMHandler is
used to mark the switchover point in main migration stream.

It can be used to inform the destination that all pre-switchover main
migration stream data has been sent/received so it can start to process
post-switchover data that it might have received via other migration
channels like the multifd ones.

Add also the relevant MigrationState bit stream compatibility property and
its hw_compat entry.

Reviewed-by: Fabiano Rosas <farosas@suse.de>
Reviewed-by: Zhang Chen <zhangckid@gmail.com> # for the COLO part
Signed-off-by: Maciej S. Szmigiero <maciej.szmigiero@oracle.com>
Link: https://lore.kernel.org/qemu-devel/311be6da85fc7e49a7598684d80aa631778dcbce.1741124640.git.maciej.szmigiero@oracle.com
Signed-off-by: Cédric Le Goater <clg@redhat.com>
This commit is contained in:
Maciej S. Szmigiero 2025-03-04 23:03:32 +01:00 • committed by Cédric Le Goater
parent b5aa74968b
commit 4e55cb3cde
12 changed files with 87 additions and 0 deletions
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3
migration/colo.c
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@ -452,6 +452,9 @@ static int colo_do_checkpoint_transaction(MigrationState *s,
bql_unlock();
goto out;
}
qemu_savevm_maybe_send_switchover_start(s->to_dst_file);
/* Note: device state is saved into buffer */
ret = qemu_save_device_state(fb);