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This precludes cross-platform interfaces, > right? Why would application want to validate data from PSP? That > precludes virtualization, right? > > Just put the key in kernel. Users have right to control their own > hardware. > Pavel This matches exactly how the interface works in Windows as well. The reason for validating the data from the PSP is because the data crosses multiple trust boundaries and this ensures that the application can trust it to make informed decisions.