From: Tom Lendacky <thomas.lendacky@amd.com>
Date: Wed, 12 Aug 2020 20:21:34 +0000 (-0500)
Subject: MdeModulePkg: Create PCDs to be used in support of SEV-ES
X-Git-Tag: edk2-stable202008~98
X-Git-Url: https://git.proxmox.com/?p=mirror_edk2.git;a=commitdiff_plain;h=39936d3393448525190b10284b77b1881808f57f

MdeModulePkg: Create PCDs to be used in support of SEV-ES

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

Two new dynamic MdeModulePkg PCDs are needed to support SEV-ES under OVMF:
  - 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>
Reviewed-by: Hao A Wu <hao.a.wu@intel.com>
Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
Regression-tested-by: Laszlo Ersek <lersek@redhat.com>
---

diff --git a/MdeModulePkg/MdeModulePkg.dec b/MdeModulePkg/MdeModulePkg.dec
index d7572eedd1..cb30a79758 100644
--- a/MdeModulePkg/MdeModulePkg.dec
+++ b/MdeModulePkg/MdeModulePkg.dec
@@ -2063,6 +2063,15 @@
   # @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 Guest-Hypervisor Communication Block (GHCB) pool allocation.
+  # @Prompt GHCB Pool Base Address
+  gEfiMdeModulePkgTokenSpaceGuid.PcdGhcbBase|0|UINT64|0x00030007
+
+  ## This dynamic PCD holds the total size of the Guest-Hypervisor Communication Block (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/MdeModulePkg/MdeModulePkg.uni b/MdeModulePkg/MdeModulePkg.uni
index 5235dee561..b8c867379a 100644
--- a/MdeModulePkg/MdeModulePkg.uni
+++ b/MdeModulePkg/MdeModulePkg.uni
@@ -1303,3 +1303,11 @@
 #string STR_gEfiMdeModulePkgTokenSpaceGuid_PcdTcgPfpMeasurementRevision_PROMPT #language en-US "TCG Platform Firmware Profile revision"
 
 #string STR_gEfiMdeModulePkgTokenSpaceGuid_PcdTcgPfpMeasurementRevision_HELP #language en-US "Indicates which TCG Platform Firmware Profile revision the EDKII firmware follows."
+
+#string STR_gEfiMdeModulePkgTokenSpaceGuid_PcdGhcbBase_PROMPT #language en-US "Guest-Hypervisor Communication Block (GHCB) Pool Base Address"
+
+#string STR_gEfiMdeModulePkgTokenSpaceGuid_PcdGhcbBase_HELP #language en-US "Used with SEV-ES support to identify an address range that is not to be encrypted."
+
+#string STR_gEfiMdeModulePkgTokenSpaceGuid_PcdGhcbSize_PROMPT #language en-US "Guest-Hypervisor Communication Block (GHCB) Pool Base Size"
+
+#string STR_gEfiMdeModulePkgTokenSpaceGuid_PcdGhcbSize_HELP #language en-US "Used with SEV-ES support to identify the size of the address range that is not to be encrypted."