Protection ring extension for computers having distinct virtual machine monitor and virtual machine address spaces
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United States of America Patent
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May 28, 1996
Issued Date -
N/A
app pub date -
Mar 22, 1994
filing date -
Jun 28, 1991
priority date (Note) -
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status (Latency Note)
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Abstract
In a system for implementing virtual machines a Virtual Machine Monitor (VMM) is assigned an address space separate and distinct from the address space assigned to the virtual machines (VMs). A VM-bit is used to determine whether the processor is executing a process in the VM or the VMM. Through the use of the separate address spaces and the VM-bit a system is disclosed wherein the VMM can take full advantage of all the protection rings offered by the system on which it runs and the VMs are also allowed to operate in an environment that essentially offers the same number of real protection rings as are available on the underlying computer system.
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