发明名称 |
Virtual machine control program and virtual machine system |
摘要 |
The program attains compatibility of suppression of an overhead accompanying page exception handling in the case of operating a program whose amount of memory use is large on a virtual machine and suppression of the overhead accompanying page exception handling in the case of operating a first OS that has a function of making another OS run on a virtual machine. A VMM creates a shadow PT (Page Table) for prohibiting reading-writing of privileged memory that requires emulation of reading/writing by using a RSV-bit, and registers the shadow PT and the second PT that a second OS operating on the first OS has in an x86 compatible CPU equipped with page exception detecting function using two PT's. When a page exception occurs, the VMM refers to cause code of the page exception and, when a P field of the cause code is 0, determines immediately that emulation is unnecessary. |
申请公布号 |
US8650375(B2) |
申请公布日期 |
2014.02.11 |
申请号 |
US201113338806 |
申请日期 |
2011.12.28 |
申请人 |
HATTORI NAOYA;MORIKI TOSHIOMI;TSUSHIMA YUJI;HITACHI, LTD. |
发明人 |
HATTORI NAOYA;MORIKI TOSHIOMI;TSUSHIMA YUJI |
分类号 |
G06F12/00;G06F13/00;G06F13/28 |
主分类号 |
G06F12/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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