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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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9
migration/options.c
View file

@ -93,6 +93,8 @@ const Property migration_properties[] = {
send_configuration, true),
DEFINE_PROP_BOOL("send-section-footer", MigrationState,
send_section_footer, true),
DEFINE_PROP_BOOL("send-switchover-start", MigrationState,
send_switchover_start, true),
DEFINE_PROP_BOOL("multifd-flush-after-each-section", MigrationState,
multifd_flush_after_each_section, false),
DEFINE_PROP_UINT8("x-clear-bitmap-shift", MigrationState,
@ -209,6 +211,13 @@ bool migrate_auto_converge(void)
return s->capabilities[MIGRATION_CAPABILITY_AUTO_CONVERGE];
}
bool migrate_send_switchover_start(void)
{
MigrationState *s = migrate_get_current();
return s->send_switchover_start;
}
bool migrate_background_snapshot(void)
{
MigrationState *s = migrate_get_current();