| 摘要 |
PURPOSE:To secure the coincidence of the VM control information within a system by rewriting the VM control information of a certain device and at the same time transferring said information to other devices when a rewriting instruction of the virtual computer VM control information is delivered to said device. CONSTITUTION:When no coincidence is produced between the contents of the VM control information holding circuits 21 and 201 of the memory control parts (MCU) 2 and 20 respectively, a CPU 1 delivers an instruction (x) which updates the contents of the circuit 21 in order to secure the VM working of a system. The MCU 2 updates the contents of the its circuit 21 based on the VM control information 31 held by a VM monitor on a main memory 3 and at the same time transfers the control information to the MCU 20 to update the contents of the circuit 201. Here the instruction (x) functions to decide that the information 31 read out of the memory 3 is stored in the circuit 21 and also whether the information 31 should be transferred or not to the circuit 201. So is with a case where a CPU 10 updates the contents of the circuit 201 of the MCU 20. |
