Add utility function to change visibility of SVSM pages

coconut-svsm / svsm

COCONUT-SVSM

MIT License

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Add utility function to change visibility of SVSM pages #204

Closed msft-jlange closed 10 months ago

msft-jlange commented 10 months ago

This PR implements helper functions that handle all aspects of changing the visibility of an SVSM-owned page, including performing PVALIDATE, tracking valid page status, requesting the page state change with the hypervisor, and changing the C-bit in the page tables.