Supporting protected computing on IBM Power Architecture
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This article describes the changes to the IBM Power Architecture that can be used to
provide enhanced protection of virtual machines from other software running on the same
system. A new higher privilege mode called Ultravisor mode is being introduced, along with the
concept of secure virtual machines (SVMs). This mode is supported by the Protected Execution
Ultravisor which will be open sourced. An SVM is protected at rest, when transmitted over a
network as a file, and while executing. In this article, we discuss the impact of this new
architecture for SVMs. There is near-zero impact on VMs.
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