On Wed, Oct 13, 2021 at 11:56:52AM -0500, Brijesh Singh wrote: > From: Michael Roth <michael.r...@amd.com> > > SEV-SNP firmware allows a special guest page to be populated with > guest CPUID values so that they can be validated against supported > host features before being loaded into encrypted guest memory to be > used instead of hypervisor-provided values [1]. > > Add handling for this in the CPUID #VC handler and use it whenever > SEV-SNP is enabled. To do so, existing CPUID handling via VmgExit is > moved to a helper, GetCpuidHyp(), and a new helper that uses the CPUID > page to do the lookup, GetCpuidFw(), is used instead when SNP is > enabled. For cases where SNP CPUID lookups still rely on fetching > specific CPUID fields from hypervisor, GetCpuidHyp() is used there as > well. > > [1]: SEV SNP Firmware ABI Specification, Rev. 0.8, 8.13.2.6
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