| 摘要 |
A method is disclosed for processing instructions in higher level virtual machines by a 370-XA mode real machine. The real machine and a low level virtual machine each execute a version of the real machine's system control program. The low level virtual machine issues a privileged (SIE) instruction which is simulated by the real machine indicating that instructions in a higher level virtual machine are to be processed. A shadow state description is created and used by the privileged instruction for describing the higher level virtual machine directly to the real machine. Shadow address translation tables are also created in the case when the higher level virtual machine is a pageable machine so that interpretive execution hardware, invoked by the privileged instruction, can translate through the higher level virtual machine translation tables followed by translation through the shadow translation tables. The privileged instruction will, in certain cases, cause the interpretive execution hardware to intercept and interpret storage key manipulating instructions in order to update the real and higher level virtual machine status bits in RCP bytes in response to bit settings in storage key bytes associated with pages which have been accessed or changed. As a result, address translation can occur from a higher level virtual machine absolute storage to the real machine absolute storage.
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