[edk2-devel] [PATCH v9 30/32] OvmfPkg/PlatformPei: mark cpuid and secrets memory reserved in EFI map

[Gerd Hoffmann]

On Wed, Oct 13, 2021 at 11:57:11AM -0500, Brijesh Singh wrote:
> When SEV-SNP is active, the CPUID and Secrets memory range contains the
> information that is used during the VM boot. The content need to be persist
> across the kexec boot. Mark the memory range as Reserved in the EFI map
> so that guest OS or firmware does not use the range as a system RAM.

Why is this needed?  Isn't the complete firmware memory tagged as
reserved anyway?

take care,
  Gerd



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