Providing virtual secure mode with different virtual trust levels each having separate memory access protections, interrupt subsystems and private processor states
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United States of America Patent
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Aug 30, 2016
Grant Date -
Mar 19, 2015
app pub date -
Feb 21, 2014
filing date -
Sep 17, 2013
priority date (Note) -
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Abstract
A virtual machine manager (e.g., hypervisor) implements a virtual secure mode that makes multiple different virtual trust levels available to virtual processors of a virtual machine. Different memory access protections (such as the ability to read, write, and/or execute memory) can be associated with different portions of memory (e.g., memory pages) for each virtual trust level. The virtual trust levels are organized as a hierarchy with a higher level virtual trust level being more privileged than a lower virtual trust level, and programs running in the higher virtual trust level being able to change memory access protections of a lower virtual trust level. The number of virtual trust levels can vary, and can vary for different virtual machines as well as for different virtual processors in the same virtual machine.
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