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Virtualization supporting guest operating systems using memory protection units

A memory protection and memory technology, applied in memory systems, preventing unauthorized use of memory, instruments, etc., can solve problems such as reducing the cost of data processing systems

Active Publication Date: 2015-09-30
ARM LTD
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Additionally, there is ongoing pressure to reduce the cost of data processing systems where possible

Method used

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  • Virtualization supporting guest operating systems using memory protection units
  • Virtualization supporting guest operating systems using memory protection units
  • Virtualization supporting guest operating systems using memory protection units

Examples

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Embodiment Construction

[0053] figure 1 A system supporting multiple virtual real-time processors and a virtual processor using virtual memory is schematically shown. The hypervisor 2 works at the second exception level EL2 and is used to control switching between virtual processors and to protect / isolate these virtual processors from each other. The first virtual real-time processor uses the first real-time operating system 4 to support the running of real-time applications 6 . When the real-time application 6 and the real-time operating system 4 specify a memory access operation, they both generate a physical address PA. The physical address PA generated by the real-time application 6 is subject to a first level of memory protection (on behalf of the guest real-time operating system 4 ) performed by a first memory protection unit, which is controlled by the real-time operating system 4 . If the memory access request is permitted by this first set of permissions, the memory access operation is als...

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Abstract

A processor (20) is provided with a first memory protection unit (38) applying a first set of permissions and a second memory protection unit (40) applying a second set of permissions. A memory access will only be permitted if both the first set of permissions and the second set of permissions are satisfied. The processor also includes a memory management unit (42) which serves to translate from virtual addresses VA to physical addresses PA. A selectable one of the first memory protection unit (38) and the memory management unit (42) is active at any given time under control of a selection bit set by a hypervisor program (2) executing at an exception level with higher privilege than the exception level at which the guest operating systems execute.

Description

technical field [0001] The present invention relates to the field of data processing systems. More particularly, the present invention relates to the provision and use of memory protection units within data processing systems. Background technique [0002] It is known to provide data processing systems with memory protection units (MPUs) for the purpose of controlling access to memory areas by programs executing on the system. The memory protection unit receives the physical address and determines whether the memory access operation is permitted according to a set of access permissions. The memory protection unit is well suited for use within real-time systems where a deterministic behavior is desired with regard to how long it takes to complete a particular processing task. Using virtual addressing in such systems is problematic because virtual addressing (eg) Potentially long delays may be introduced. [0003] As processing system technology advances, there is an accom...

Claims

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Application Information

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IPC IPC(8): G06F12/14
CPCG06F12/1491G06F12/1483G06F12/1425G06F12/145G06F12/1441G06F2212/1052G06F2212/152G06F12/1009G06F3/0622G06F3/0637G06F3/0683G06F3/0664G06F9/45558G06F9/45545G06F2009/45583G06F2009/45587
Inventor 理查德·罗伊·格里森思怀特西蒙·约翰·克拉斯克安东尼·约翰·古达克
Owner ARM LTD
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