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When invalidating a translation block, set an invalid flag into the TranslationBlock structure first. It is also necessary to check whether the target TB is still valid after acquiring 'tb_lock' but before calling tb_add_jump() since TB lookup is to be performed out of 'tb_lock' in future. Note that we don't have to check 'last_tb'; an already invalidated TB will not be executed anyway and it is thus safe to patch it. Suggested-by: Sergey Fedorov <serge.fdrv@gmail.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>