x86/sev: Move MSR-based VMGEXITs for CPUID to helper

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This code will also be used later for SEV-SNP-validated CPUID code in
some cases, so move it to a common helper.

While here, also add a check to terminate in cases where the CPUID
function/subfunction is indexed and the subfunction is non-zero, since
the GHCB MSR protocol does not support non-zero subfunctions.

Suggested-by: Sean Christopherson <seanjc@google.com>
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/20220307213356.2797205-32-brijesh.singh@amd.com

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Michael Roth 2022-02-24 10:56:11 -06:00 • committed by Borislav Petkov

parent b66370db9a

commit 801baa693c

3 changed files with 59 additions and 26 deletions

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arch/x86/boot/compressed/sev.c

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arch/x86/kernel/sev-shared.c

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arch/x86/kernel/sev.c

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