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migration: fix incorrect memory_global_dirty_log_start outside BQL 

This can cause various segmentation faults or aborts in qemu-iotests
test 091.

Fixes: 5b82b703b6
Cc: Dave Gilbert <dgilbert@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2016-02-15 19:57:57 +01:00
parent 98799b0d4b
commit 4987783400
1 changed files with 4 additions and 0 deletions
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4
migration/ram.c
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@ -1920,6 +1920,9 @@ static int ram_save_setup(QEMUFile *f, void *opaque)
acct_clear();
}
/* For memory_global_dirty_log_start below. */
qemu_mutex_lock_iothread();
qemu_mutex_lock_ramlist();
rcu_read_lock();
bytes_transferred = 0;
@ -1944,6 +1947,7 @@ static int ram_save_setup(QEMUFile *f, void *opaque)
memory_global_dirty_log_start();
migration_bitmap_sync();
qemu_mutex_unlock_ramlist();
qemu_mutex_unlock_iothread();
qemu_put_be64(f, ram_bytes_total() | RAM_SAVE_FLAG_MEM_SIZE);