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1. 发明授权

US07487313B1 Restricting memory access to protect data when sharing a common address space 有权
公开(公告)号：US07487313B1
公开(公告)日：2009-02-03
申请号：US11865635
申请日：2007-10-01
申请人： Ole Agesen , Jeffrey W. Sheldon
发明人： Ole Agesen , Jeffrey W. Sheldon
IPC分类号： G06F12/00
CPC分类号： G06F12/1036 , G06F12/1475 , G06F2212/656
摘要： A first software entity occupies a portion of a linear address space of a second software entity and prevents the second software entity from accessing the memory of the first software entity. For example, in one embodiment of the invention, the first software entity is a virtual machine monitor (VMM), which supports a virtual machine (VM), the second software entity. The VMM sometimes directly executes guest instructions from the VM and, at other times, the VMM executes binary translated instructions derived from guest instructions. When executing binary translated instructions, the VMM uses memory segmentation to protect its memory. When directly executing guest instructions, the VMM may use either memory segmentation or a memory paging mechanism to protect its memory. When the memory paging mechanism is active during direct execution, the protection from the memory segmentation mechanism may be selectively deactivated to improve the efficiency of the virtual computer system.

2. 发明授权

US07277998B1 Restricting memory access to protect data when sharing a common address space 有权
标题翻译：限制内存访问以在共享公共地址空间时保护数据
公开(公告)号：US07277998B1
公开(公告)日：2007-10-02
申请号：US10917732
申请日：2004-08-12
申请人： Ole Agesen , Jeffrey W. Sheldon
发明人： Ole Agesen , Jeffrey W. Sheldon
IPC分类号： G06F12/00
CPC分类号： G06F12/1036 , G06F12/1475 , G06F2212/656
摘要： A first software entity occupies a portion of a linear address space of a second software entity and prevents the second software entity from accessing the memory of the first software entity. For example, in one embodiment of the invention, the first software entity is a virtual machine monitor (VMM), which supports a virtual machine (VM), the second software entity. The VMM sometimes directly executes guest instructions from the VM and, at other times, the VMM executes binary translated instructions derived from guest instructions. When executing binary translated instructions, the VMM uses memory segmentation to protect its memory. When directly executing guest instructions, the VMM may use either memory segmentation or a memory paging mechanism to protect its memory. When the memory paging mechanism is active during direct execution, the protection from the memory segmentation mechanism may be selectively deactivated to improve the efficiency of the virtual computer system.
摘要翻译：第一软件实体占用第二软件实体的线性地址空间的一部分，并且防止第二软件实体访问第一软件实体的存储器。例如，在本发明的一个实施例中，第一软件实体是支持虚拟机（VM）的第二软件实体的虚拟机监视器（VMM）。 VMM有时直接从VM执行访客指令，而在其他时候，VMM执行从访客指令导出的二进制翻译指令。当执行二进制转换指令时，VMM使用存储器分段来保护其内存。当直接执行访客指令时，VMM可以使用存储器分段或存储器寻呼机制来保护其存储器。当存储器分页机制在直接执行期间有效时，可以选择性地停止对存储器分段机制的保护，以提高虚拟计算机系统的效率。

3. 发明授权

US07487314B1 Restricting memory access to protect data when sharing a common address space 有权
公开(公告)号：US07487314B1
公开(公告)日：2009-02-03
申请号：US11865658
申请日：2007-10-01
申请人： Ole Agesen , Jeffrey W. Sheldon
发明人： Ole Agesen , Jeffrey W. Sheldon
IPC分类号： G06F12/00
CPC分类号： G06F12/1027 , G06F12/1475 , G06F2212/656
摘要： A first software entity occupies a portion of a linear address space of a second software entity and prevents the second software entity from accessing the memory of the first software entity. For example, in one embodiment of the invention, the first software entity is a virtual machine monitor (VMM), which supports a virtual machine (VM), the second software entity. The VMM sometimes directly executes guest instructions from the VM and, at other times, the VMM executes binary translated instructions derived from guest instructions. When executing binary translated instructions, the VMM uses memory segmentation to protect its memory. When directly executing guest instructions, the VMM may use either memory segmentation or a memory paging mechanism to protect its memory. When the memory paging mechanism is active during direct execution, the protection from the memory segmentation mechanism may be selectively deactivated to improve the efficiency of the virtual computer system.

4. 发明授权

US07281102B1 Restricting memory access to protect data when sharing a common address space 有权
公开(公告)号：US07281102B1
公开(公告)日：2007-10-09
申请号：US10917713
申请日：2004-08-12
申请人： Ole Agesen , Jeffrey W. Sheldon
发明人： Ole Agesen , Jeffrey W. Sheldon
IPC分类号： G06F12/00
CPC分类号： G06F12/1458 , G06F12/1036 , G06F12/109 , G06F12/145 , G06F2212/656
摘要： A first software entity occupies a portion of a linear address space of a second software entity and prevents the second software entity from accessing the memory of the first software entity. For example, in one embodiment of the invention, the first software entity is a virtual machine monitor (VMM), which supports a virtual machine (VM), the second software entity. The VMM sometimes directly executes guest instructions from the VM and, at other times, the VMM executes binary translated instructions derived from guest instructions. When executing binary translated instructions, the VMM uses memory segmentation to protect its memory. When directly executing guest instructions, the VMM may use either memory segmentation or a memory paging mechanism to protect its memory. When the memory paging mechanism is active during direct execution, the protection from the memory segmentation mechanism may be selectively deactivated to improve the efficiency of the virtual computer system.

5. 发明授权

US07277999B1 Restricting memory access to protect data when sharing a common address space 有权
公开(公告)号：US07277999B1
公开(公告)日：2007-10-02
申请号：US10918044
申请日：2004-08-12
申请人： Ole Agesen , Jeffrey W. Sheldon
发明人： Ole Agesen , Jeffrey W. Sheldon
IPC分类号： G06F12/00
CPC分类号： G06F12/1027 , G06F12/1475 , G06F2212/656
摘要： A first software entity occupies a portion of a linear address space of a second software entity and prevents the second software entity from accessing the memory of the first software entity. For example, in one embodiment of the invention, the first software entity is a virtual machine monitor (VMM), which supports a virtual machine (VM), the second software entity. The VMM sometimes directly executes guest instructions from the VM and, at other times, the VMM executes binary translated instructions derived from guest instructions. When executing binary translated instructions, the VMM uses memory segmentation to protect its memory. When directly executing guest instructions, the VMM may use either memory segmentation or a memory paging mechanism to protect its memory. When the memory paging mechanism is active during direct execution, the protection from the memory segmentation mechanism may be selectively deactivated to improve the efficiency of the virtual computer system.

6. 发明授权

US08572606B1 System and method for avoiding synchronization bugs through virtualization 有权
标题翻译：通过虚拟化避免同步错误的系统和方法
公开(公告)号：US08572606B1
公开(公告)日：2013-10-29
申请号：US11365012
申请日：2006-03-01
申请人： Ole Agesen , Michael Cohen , Jeffrey W. Sheldon
发明人： Ole Agesen , Michael Cohen , Jeffrey W. Sheldon
IPC分类号： G06F9/455
CPC分类号： G06F11/1402 , G06F9/45516 , G06F11/004 , G06F2201/815 , G06F2201/82
摘要： A system and method for reducing the likelihood of concurrency errors by identifying vulnerable segments of computer code and stalling other virtual machine threads of execution. According to one embodiment of the present invention, the vulnerable segment is identified at runtime, for example in a dynamic translator. According to another embodiment of the present invention, the vulnerable segment is identified ahead of time, for example in a static translator. According to yet another embodiment of the present invention, the vulnerable segment is identified in the binary translator of a virtual machine monitor.
摘要翻译：通过识别计算机代码的易受攻击的部分并拖延执行其他虚拟机线程来减少并发错误的可能性的系统和方法。根据本发明的一个实施例，在运行时识别易受攻击的段，例如在动态翻译器中。根据本发明的另一个实施例，提前识别易受攻击的段，例如在静态转换器中。根据本发明的另一个实施例，在虚拟机监视器的二进制转换器中识别易受攻击的段。

7. 发明授权

US08316193B2 Optimizing segment access in binary translation 有权
标题翻译：优化二进制翻译中的段访问
公开(公告)号：US08316193B2
公开(公告)日：2012-11-20
申请号：US12629682
申请日：2009-12-02
申请人： Ross Charles Knippel , Jeffrey W. Sheldon , Ole Agesen
发明人： Ross Charles Knippel , Jeffrey W. Sheldon , Ole Agesen
IPC分类号： G06F12/00
CPC分类号： G06F9/45516 , G06F9/45558 , G06F2009/45583
摘要： A mechanism for a binary translator to emit code that will pre-generate information about a memory segment when a segment selector is assigned to a segment register. The binary translator emits code that will be executed when a memory access using that segment register is encountered and the emitted code will access the pre-generated information when evaluating the memory access request. Memory accesses, where a number of bytes being accessed is less than or equal to a predetermined value, are validated with a number of steps in the code emitted by the binary translator.
摘要翻译：一种二进制转换器发出代码的机制，当段选择器被分配给段寄存器时，该代码将预先生成关于存储器段的信息。二进制翻译器发出将在遇到使用该段寄存器的存储器访问时执行的代码，并且当评估存储器访问请求时，发出的代码将访问预生成的信息。存储器访问（其中访问的字节数小于或等于预定值）通过二进制翻译器发出的代码中的多个步骤来验证。

8. 发明授权

US07506122B1 Restricting memory access to protect data when sharing a common address space 有权
标题翻译：限制内存访问以在共享公共地址空间时保护数据
公开(公告)号：US07506122B1
公开(公告)日：2009-03-17
申请号：US11865641
申请日：2007-10-01
申请人： Ole Agesen , Jeffrey W. Sheldon
发明人： Ole Agesen , Jeffrey W. Sheldon
IPC分类号： G06F12/00
CPC分类号： G06F12/1458 , G06F12/1036 , G06F12/109 , G06F12/145 , G06F2212/656
摘要： A first software entity occupies a portion of a linear address space of a second software entity and prevents the second software entity from accessing the memory of the first software entity. For example, in one embodiment of the invention, the first software entity is a virtual machine monitor (VMM), which supports a virtual machine (VM), the second software entity. The VMM sometimes directly executes guest instructions from the VM and, at other times, the VMM executes binary translated instructions derived from guest instructions. When executing binary translated instructions, the VMM uses memory segmentation to protect its memory. When directly executing guest instructions, the VMM may use either memory segmentation or a memory paging mechanism to protect its memory. When the memory paging mechanism is active during direct execution, the protection from the memory segmentation mechanism may be selectively deactivated to improve the efficiency of the virtual computer system.
摘要翻译：第一软件实体占用第二软件实体的线性地址空间的一部分，并且防止第二软件实体访问第一软件实体的存储器。例如，在本发明的一个实施例中，第一软件实体是支持虚拟机（VM）的第二软件实体的虚拟机监视器（VMM）。 VMM有时直接从VM执行访客指令，而在其他时候，VMM执行从访客指令导出的二进制翻译指令。当执行二进制转换指令时，VMM使用存储器分段来保护其内存。当直接执行访客指令时，VMM可以使用存储器分段或存储器寻呼机制来保护其存储器。当存储器分页机制在直接执行期间有效时，可以选择性地停止对存储器分段机制的保护，以提高虚拟计算机系统的效率。

9. 发明授权

US08006043B2 System and method for maintaining memory page sharing in a virtual environment 有权
标题翻译：在虚拟环境中维护内存页共享的系统和方法
公开(公告)号：US08006043B2
公开(公告)日：2011-08-23
申请号：US12246402
申请日：2008-10-06
申请人： Ole Agesen
发明人： Ole Agesen
IPC分类号： G06F12/08
CPC分类号： G06F12/08 , G06F9/45537 , G06F9/544 , G06F2209/542
摘要： In a virtualized system using memory page sharing, a method is provided for maintaining sharing when Guest code attempts to write to the shared memory. In one embodiment, virtualization logic uses a pattern matcher to recognize and intercept page zeroing code in the Guest OS. When the page zeroing code is about to run against a page that is already zeroed, i.e., contains all zeros, and is being shared, the memory writes in the page zeroing code have no effect. The virtualization logic skips over the writes, providing an appearance that the Guest OS page zeroing code has run to completion but without performing any of the writes that would have caused a loss of page sharing. The pattern matcher can be part of a binary translator that inspects code before it executes.
摘要翻译：在使用内存页面共享的虚拟化系统中，提供了一种方法，用于在访客代码尝试写入共享内存时保持共享。在一个实施例中，虚拟化逻辑使用模式匹配器来识别和拦截访客操作系统中的页面归零代码。当页面归零代码即将针对已经归零的页面运行时，即包含全部零，并且正在共享时，页面调零代码中的内存写入不起作用。虚拟化逻辑跳过写入，提供Guest OS页面调零代码已经运行到完成的外观，但不执行会导致页面共享丢失的任何写入。模式匹配器可以是在执行代码之前检查代码的二进制转换器的一部分。

10. 发明授权

US07069413B1 Method and system for performing virtual to physical address translations in a virtual machine monitor 有权
标题翻译：用于在虚拟机监视器中执行虚拟到物理地址转换的方法和系统
公开(公告)号：US07069413B1
公开(公告)日：2006-06-27
申请号：US10354556
申请日：2003-01-29
申请人： Ole Agesen , Pratap Subrahmanyam
发明人： Ole Agesen , Pratap Subrahmanyam
IPC分类号： G06F12/00
CPC分类号： G06F12/1072 , G06F12/1036 , G06F2212/682
摘要： The invention is used in a virtual machine monitor for a multiprocessing system that includes a virtual memory system. During a software-based processing of a guest instruction, including translating or interpreting a guest instruction, mappings between virtual addresses and physical addresses are retained in memory until processing of the guest instruction is completed. The retained mappings may be cleared after each guest instruction has been processed, or after multiple guest instructions have been processed. Information may also be stored to indicate that an attempt to map a virtual address to a physical address was not successful. The invention may be extended beyond virtual machine monitors to other systems involving the software-based processing of instructions, and beyond multiprocessing systems to other systems involving concurrent access to virtual memory management data.
摘要翻译：本发明用于包括虚拟存储器系统的多处理系统的虚拟机监视器中。在访客指令的基于软件的处理中，包括翻译或解释访客指令，虚拟地址和物理地址之间的映射被保留在存储器中，直到访客指令的处理完成。保留的映射可以在每个客户指令被处理之后或在多个客户指令被处理之后被清除。还可以存储信息以指示将虚拟地址映射到物理地址的尝试不成功。本发明可以扩展到虚拟机监视器以外的其他系统，涉及指令的基于软件的处理，并且超出多处理系统到涉及对虚拟存储器管理数据的并发访问的其他系统。

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