x86/compressed/64: Add support for SEV-SNP CPUID table in #VC handlers

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CPUID instructions generate a #VC exception for SEV-ES/SEV-SNP guests,
for which early handlers are currently set up to handle. In the case
of SEV-SNP, guests can use a configurable location in guest memory
that has been pre-populated with a firmware-validated CPUID table to
look up the relevant CPUID values rather than requesting them from
hypervisor via a VMGEXIT. Add the various hooks in the #VC handlers to
allow CPUID instructions to be handled via the table. The code to
actually configure/enable the table will be added in a subsequent
commit.

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/20220307213356.2797205-33-brijesh.singh@amd.com

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Michael Roth 2022-02-24 10:56:12 -06:00 • committed by Borislav Petkov

parent 801baa693c

commit ee0bfa08a3

2 changed files with 326 additions and 0 deletions

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arch/x86/include/asm/sev-common.h

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324

arch/x86/kernel/sev-shared.c

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