x86/compressed: Add SEV-SNP feature detection/setup

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Initial/preliminary detection of SEV-SNP is done via the Confidential
Computing blob. Check for it prior to the normal SEV/SME feature
initialization, and add some sanity checks to confirm it agrees with
SEV-SNP CPUID/MSR bits.

Signed-off-by: Michael Roth <michael.roth@amd.com>
Signed-off-by: Brijesh Singh <brijesh.singh@amd.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: https://lore.kernel.org/r/20220307213356.2797205-35-brijesh.singh@amd.com

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Michael Roth 2022-02-24 10:56:14 -06:00 • committed by Borislav Petkov

parent 8c9c509baf

commit c01fce9cef

2 changed files with 114 additions and 1 deletions

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112

arch/x86/boot/compressed/sev.c

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3

arch/x86/include/asm/sev.h

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