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migration: Cleanup incoming migration setup state change

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Destination QEMU can setup incoming ports for two purposes: either a fresh
new incoming migration, in which QEMU will switch to SETUP for channel
establishment, or a paused postcopy migration, in which QEMU will stay in
POSTCOPY_PAUSED until kicking off the RECOVER phase.

Now the state machine worked on dest node for the latter, only because
migrate_set_state() implicitly will become a noop if the current state
check failed.  It wasn't clear at all.

Clean it up by providing a helper migration_incoming_state_setup() doing
proper checks over current status.  Postcopy-paused will be explicitly
checked now, and then we can bail out for unknown states.

Reviewed-by: Fabiano Rosas <farosas@suse.de>
Signed-off-by: Peter Xu <peterx@redhat.com>
Signed-off-by: Fabiano Rosas <farosas@suse.de>
This commit is contained in:
Peter Xu 2024-06-19 18:30:39 -04:00 • committed by Fabiano Rosas
parent a5c24e13e9
commit 4dd5f7b8d5
1 changed files with 26 additions and 2 deletions
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28
migration/migration.c
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@ -618,6 +618,29 @@ bool migrate_uri_parse(const char *uri, MigrationChannel **channel,
return true; return true;
} }
static bool
migration_incoming_state_setup(MigrationIncomingState *mis, Error **errp)
{
MigrationStatus current = mis->state;
if (current == MIGRATION_STATUS_POSTCOPY_PAUSED) {
/*
* Incoming postcopy migration will stay in PAUSED state even if
* reconnection happened.
*/
return true;
}
if (current != MIGRATION_STATUS_NONE) {
error_setg(errp, "Illegal migration incoming state: %s",
MigrationStatus_str(current));
return false;
}
migrate_set_state(&mis->state, current, MIGRATION_STATUS_SETUP);
return true;
}
static void qemu_start_incoming_migration(const char *uri, bool has_channels, static void qemu_start_incoming_migration(const char *uri, bool has_channels,
MigrationChannelList *channels, MigrationChannelList *channels,
Error **errp) Error **errp)
@ -656,8 +679,9 @@ static void qemu_start_incoming_migration(const char *uri, bool has_channels,
return; return;
} }
migrate_set_state(&mis->state, MIGRATION_STATUS_NONE, if (!migration_incoming_state_setup(mis, errp)) {
MIGRATION_STATUS_SETUP); return;
}
if (addr->transport == MIGRATION_ADDRESS_TYPE_SOCKET) { if (addr->transport == MIGRATION_ADDRESS_TYPE_SOCKET) {
SocketAddress *saddr = &addr->u.socket; SocketAddress *saddr = &addr->u.socket;