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Importing a new version from external source
Third kind of limitations is caused by applications, which use non-virtual capabilities, which are directly accessible at user level. F.e. a process could use CPU timestamps to calculate some timings, or it could use SMP CPU ID to optimize memory accesses. In this case completely transparent migration would be possible only using virtualization techniques provided by the latest Intel CPUs and it is not even clear, whether unavoidable overhead introduced at this level of virtualization is worth of maintaining such exotic applications.