BZ: https://bugzilla.tianocore.org/show_bug.cgi?id=2198

Two new fixed PCDs are needed to support SEV-ES under OVMF:
  - PcdSecGhcbBase  UINT64 value that is the base address of the GHCB
                    used during the SEC phase.
  - PcdSecGhcbSize  UINT64 value that is the size, in bytes, of the GHCB
                    area used during the SEC phase.

Three new dynamic PCDs are needed to support SEV-ES under OVMF:
  - PcdSevEsIsEnabled: BOOLEAN value used to indicate if SEV-ES is enabled
  - PcdGhcbBase:       UINT64 value that is the base address of the GHCB
                       allocation.
  - PcdGhcbSize:       UINT64 value that is the size, in bytes, of the
                       GHCB allocation (size is dependent on the number of
                       APs).

Cc: Jian J Wang <jian.j.wang@intel.com>
Cc: Hao A Wu <hao.a.wu@intel.com>
Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
---
 MdeModulePkg/MdeModulePkg.dec |  9 +++++++++
 UefiCpuPkg/UefiCpuPkg.dec     | 14 ++++++++++++++
 2 files changed, 23 insertions(+)

diff --git a/MdeModulePkg/MdeModulePkg.dec b/MdeModulePkg/MdeModulePkg.dec
index e840cebe2eae..4474c4d5bd43 100644
--- a/MdeModulePkg/MdeModulePkg.dec
+++ b/MdeModulePkg/MdeModulePkg.dec
@@ -2065,6 +2065,15 @@ [PcdsDynamic, PcdsDynamicEx]
   # @Prompt If there is any test key used by the platform.
   gEfiMdeModulePkgTokenSpaceGuid.PcdTestKeyUsed|FALSE|BOOLEAN|0x00030003
 
+  ## This dynamic PCD holds the base address of the GHCB pool allocation.
+  # @Prompt GHCB Pool Base Address
+  gEfiMdeModulePkgTokenSpaceGuid.PcdGhcbBase|0|UINT64|0x00030007
+
+  ## This dynamic PCD holds the total size of the GHCB pool allocation.
+  #  The amount of memory allocated for GHCBs is dependent on the number of APs.
+  # @Prompt GHCB Pool Size
+  gEfiMdeModulePkgTokenSpaceGuid.PcdGhcbSize|0|UINT64|0x00030008
+
 [PcdsDynamicEx]
   ## This dynamic PCD enables the default variable setting.
   #  Its value is the default store ID value. The default value is zero as Standard default.
diff --git a/UefiCpuPkg/UefiCpuPkg.dec b/UefiCpuPkg/UefiCpuPkg.dec
index a6ebdde1cfb6..005703d8a3e7 100644
--- a/UefiCpuPkg/UefiCpuPkg.dec
+++ b/UefiCpuPkg/UefiCpuPkg.dec
@@ -161,6 +161,14 @@ [PcdsFixedAtBuild]
   # @Prompt Specify the count of pre allocated SMM MP tokens per chunk.
   gUefiCpuPkgTokenSpaceGuid.PcdCpuSmmMpTokenCountPerChunk|64|UINT32|0x30002002
 
+  ## The base address of the SEC GHCB page used by SEV-ES.
+  # @Prompt SEC GHCB Base Address
+  gUefiCpuPkgTokenSpaceGuid.PcdSecGhcbBase|0|UINT32|0x30002003
+
+  ## The total size of the SEC GHCB page used by SEV-ES.
+  # @Prompt SEC GHCB Size
+  gUefiCpuPkgTokenSpaceGuid.PcdSecGhcbSize|0|UINT32|0x30002004
+
 [PcdsFixedAtBuild, PcdsPatchableInModule]
   ## This value is the CPU Local APIC base address, which aligns the address on a 4-KByte boundary.
   # @Prompt Configure base address of CPU Local APIC
@@ -367,5 +375,11 @@ [PcdsDynamic, PcdsDynamicEx]
   # @ValidRange  0x80000001 | 0 - 1
   gUefiCpuPkgTokenSpaceGuid.PcdCpuProcTraceOutputScheme|0x0|UINT8|0x60000015
 
+  ## This dynamic PCD indicates whether SEV-ES is enabled
+  #   TRUE  - SEV-ES is enabled
+  #   FALSE - SEV-ES is not enabled
+  # @Prompt SEV-ES Status
+  gUefiCpuPkgTokenSpaceGuid.PcdSevEsIsEnabled|FALSE|BOOLEAN|0x60000016
+
 [UserExtensions.TianoCore."ExtraFiles"]
   UefiCpuPkgExtra.uni
-- 
2.17.1


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