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migration: block-dirty-bitmap: add missing qemu_mutex_lock_iothread 

init_dirty_bitmap_migration assumes the iothread lock (BQL)
to be held, but instead it isn't.

Instead of adding the lock to qemu_savevm_state_setup(),
follow the same pattern as the other ->save_setup callbacks
and lock+unlock inside dirty_bitmap_save_setup().

Signed-off-by: Emanuele Giuseppe Esposito <eesposit@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-Id: <20211005080751.3797161-2-eesposit@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Emanuele Giuseppe Esposito 2021-10-05 04:07:50 -04:00 committed by Paolo Bonzini
parent 4dba278908
commit 3c158eba1e
1 changed files with 4 additions and 1 deletions
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5
migration/block-dirty-bitmap.c
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@ -1215,7 +1215,10 @@ static int dirty_bitmap_save_setup(QEMUFile *f, void *opaque)
{
DBMSaveState *s = &((DBMState *)opaque)->save;
SaveBitmapState *dbms = NULL;
qemu_mutex_lock_iothread();
if (init_dirty_bitmap_migration(s) < 0) {
qemu_mutex_unlock_iothread();
return -1;
}
@ -1223,7 +1226,7 @@ static int dirty_bitmap_save_setup(QEMUFile *f, void *opaque)
send_bitmap_start(f, s, dbms);
}
qemu_put_bitmap_flags(f, DIRTY_BITMAP_MIG_FLAG_EOS);
qemu_mutex_unlock_iothread();
return 0;
}