x86/sev: Add RMP entry lookup helpers

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Add a helper that can be used to access information contained in the RMP
entry corresponding to a particular PFN. This will be needed to make
decisions on how to handle setting up mappings in the NPT in response to
guest page-faults and handling things like cleaning up pages and setting
them back to the default hypervisor-owned state when they are no longer
being used for private data.

  [ mdr: separate 'assigned' indicator from return code, and simplify
    function signatures for various helpers. ]

Signed-off-by: Brijesh Singh <brijesh.singh@amd.com>
Co-developed-by: Ashish Kalra <ashish.kalra@amd.com>
Signed-off-by: Ashish Kalra <ashish.kalra@amd.com>
Signed-off-by: Michael Roth <michael.roth@amd.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Link: https://lore.kernel.org/r/20240126041126.1927228-7-michael.roth@amd.com

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Brijesh Singh 2024-01-25 22:11:06 -06:00 • committed by Borislav Petkov (AMD)

parent e3fd08afb7

commit 94b36bc244

2 changed files with 52 additions and 0 deletions

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3

arch/x86/include/asm/sev.h

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49

arch/x86/virt/svm/sev.c

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