So that accesses from multiple threads are safe.
Signed-off-by: NFam Zheng <famz@redhat.com>
Message-Id: <1426496617-10702-4-git-send-email-famz@redhat.com>
[Remove #if from cpu_exec_init_all. - Paolo]
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>