x86/sev: Add a helper for the PVALIDATE instruction

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An SNP-active guest uses the PVALIDATE instruction to validate or
rescind the validation of a guest page’s RMP entry. Upon completion, a
return code is stored in EAX and rFLAGS bits are set based on the return
code. If the instruction completed successfully, the carry flag (CF)
indicates if the content of the RMP were changed or not.

See AMD APM Volume 3 for additional details.

Signed-off-by: Brijesh Singh <brijesh.singh@amd.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Venu Busireddy <venu.busireddy@oracle.com>
Link: https://lore.kernel.org/r/20220307213356.2797205-14-brijesh.singh@amd.com

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Brijesh Singh 2022-02-09 12:10:07 -06:00 • committed by Borislav Petkov

parent cbd3d4f7c4

commit 0bd6f1e526

1 changed files with 21 additions and 0 deletions

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arch/x86/include/asm/sev.h

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