[PATCH v4 5/6] MdeModulePkg: add EnableUnacceptedMemoryProtocol

["Dionna Glaze" <dionnaglaze@google.com>]

Add a simple protocol that enables the use of the unaccepted memory
type. Must be called before ExitBootServices to be effective.

Cc: Gerd Hoffmann <kraxel@redhat.com>
Cc: James Bottomley <jejb@linux.ibm.com>
Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Tom Lendacky <thomas.lendacky@amd.com>
Cc: Ard Biesheuvel <ardb@kernel.org>

Signed-off-by: Dionna Glaze <dionnaglaze@google.com>
---
 MdeModulePkg/Core/Dxe/DxeMain.h         | 22 ++++++++++++
 MdeModulePkg/Core/Dxe/DxeMain.inf       |  3 +-
 MdeModulePkg/Core/Dxe/DxeMain/DxeMain.c |  5 +++
 MdeModulePkg/Core/Dxe/Mem/Page.c        | 35 ++++++++++++++++++++
 MdeModulePkg/MdeModulePkg.dec           |  3 ++
 5 files changed, 67 insertions(+), 1 deletion(-)

diff --git a/MdeModulePkg/Core/Dxe/DxeMain.h b/MdeModulePkg/Core/Dxe/DxeMain.h
index ac943c87a3..5f0114b04f 100644
--- a/MdeModulePkg/Core/Dxe/DxeMain.h
+++ b/MdeModulePkg/Core/Dxe/DxeMain.h
@@ -2708,6 +2708,28 @@ CoreResolveUnacceptedMemory (
   VOID
   );
 
+
+typedef struct _ENABLE_UNACCEPTED_MEMORY_PROTOCOL
+    ENABLE_UNACCEPTED_MEMORY_PROTOCOL;
+
+typedef EFI_STATUS (EFIAPI *ENABLE_UNACCEPTED_MEMORY)(
+  IN ENABLE_UNACCEPTED_MEMORY_PROTOCOL *
+  );
+
+struct _ENABLE_UNACCEPTED_MEMORY_PROTOCOL {
+  ENABLE_UNACCEPTED_MEMORY Enable;
+};
+
+extern EFI_GUID gEnableUnacceptedMemoryProtocolGuid;
+
+/**
+   Implement the protocol for enabling unaccepted memory.
+ **/
+VOID
+InstallEnableUnacceptedMemoryProtocol (
+  VOID
+  );
+
 /**
   Install MemoryAttributesTable on memory allocation.
 
diff --git a/MdeModulePkg/Core/Dxe/DxeMain.inf b/MdeModulePkg/Core/Dxe/DxeMain.inf
index deb8bb2ba8..39dcac98bb 100644
--- a/MdeModulePkg/Core/Dxe/DxeMain.inf
+++ b/MdeModulePkg/Core/Dxe/DxeMain.inf
@@ -122,6 +122,7 @@
   gEfiMemoryAttributesTableGuid                 ## SOMETIMES_PRODUCES   ## SystemTable
   gEfiEndOfDxeEventGroupGuid                    ## SOMETIMES_CONSUMES   ## Event
   gEfiHobMemoryAllocStackGuid                   ## SOMETIMES_CONSUMES   ## SystemTable
+  gEnableUnacceptedMemoryProtocolGuid           ## PRODUCES             ## GUID # Install protocol
 
 [Ppis]
   gEfiVectorHandoffInfoPpiGuid                  ## UNDEFINED # HOB
@@ -187,7 +188,7 @@
   gEfiMdeModulePkgTokenSpaceGuid.PcdHeapGuardPropertyMask                   ## CONSUMES
   gEfiMdeModulePkgTokenSpaceGuid.PcdCpuStackGuard                           ## CONSUMES
   gEfiMdeModulePkgTokenSpaceGuid.PcdFwVolDxeMaxEncapsulationDepth           ## CONSUMES
-  gEfiMdeModulePkgTokenSpaceGuid.PcdEnableUnacceptedMemory                  ## CONSUMES
+  gEfiMdeModulePkgTokenSpaceGuid.PcdEnableUnacceptedMemory                  ## CONSUMES ## SOMETIMES_PRODUCES
 
 # [Hob]
 # RESOURCE_DESCRIPTOR   ## CONSUMES
diff --git a/MdeModulePkg/Core/Dxe/DxeMain/DxeMain.c b/MdeModulePkg/Core/Dxe/DxeMain/DxeMain.c
index 8d1de32fe7..bc1a8ab6b2 100644
--- a/MdeModulePkg/Core/Dxe/DxeMain/DxeMain.c
+++ b/MdeModulePkg/Core/Dxe/DxeMain/DxeMain.c
@@ -354,6 +354,11 @@ DxeMain (
   Status = CoreInstallConfigurationTable (&gEfiMemoryTypeInformationGuid, &gMemoryTypeInformation);
   ASSERT_EFI_ERROR (Status);
 
+  //
+  // Install unaccepted memory configuration protocol
+  //
+  InstallEnableUnacceptedMemoryProtocol();
+
   //
   // If Loading modules At fixed address feature is enabled, install Load moduels at fixed address
   // Configuration Table so that user could easily to retrieve the top address to load Dxe and PEI
diff --git a/MdeModulePkg/Core/Dxe/Mem/Page.c b/MdeModulePkg/Core/Dxe/Mem/Page.c
index cbebe62a28..10e152d80d 100644
--- a/MdeModulePkg/Core/Dxe/Mem/Page.c
+++ b/MdeModulePkg/Core/Dxe/Mem/Page.c
@@ -96,6 +96,14 @@ EFI_MEMORY_TYPE_INFORMATION  gMemoryTypeInformation[EfiMaxMemoryType + 1] = {
 //
 GLOBAL_REMOVE_IF_UNREFERENCED   BOOLEAN  gLoadFixedAddressCodeMemoryReady = FALSE;
 
+EFI_STATUS EFIAPI CoreEnableUnacceptedMemory(IN ENABLE_UNACCEPTED_MEMORY_PROTOCOL *);
+
+struct {
+  ENABLE_UNACCEPTED_MEMORY enable;
+} mEnableUnacceptedMemoryProtocol = {
+  CoreEnableUnacceptedMemory,
+};
+
 /**
   Enter critical section by gaining lock on gMemoryLock.
 
@@ -2205,6 +2213,33 @@ CoreResolveUnacceptedMemory (
   return AcceptAllUnacceptedMemory(AcceptMemory);
 }
 
+EFI_STATUS
+EFIAPI
+CoreEnableUnacceptedMemory (
+  IN ENABLE_UNACCEPTED_MEMORY_PROTOCOL *This
+  )
+{
+  return PcdSetBoolS(PcdEnableUnacceptedMemory, TRUE);
+}
+
+VOID
+InstallEnableUnacceptedMemoryProtocol (
+  VOID
+  )
+{
+  EFI_HANDLE  Handle;
+  EFI_STATUS  Status;
+
+  Handle = NULL;
+  Status = CoreInstallMultipleProtocolInterfaces (
+             &Handle,
+             &gEnableUnacceptedMemoryProtocolGuid,
+             &mEnableUnacceptedMemoryProtocol,
+             NULL
+             );
+  ASSERT_EFI_ERROR (Status);
+}
+
 /**
   Make sure the memory map is following all the construction rules,
   it is the last time to check memory map error before exit boot services.
diff --git a/MdeModulePkg/MdeModulePkg.dec b/MdeModulePkg/MdeModulePkg.dec
index dd07b3725a..ce72c06a93 100644
--- a/MdeModulePkg/MdeModulePkg.dec
+++ b/MdeModulePkg/MdeModulePkg.dec
@@ -244,6 +244,9 @@
   gEdkiiPerformanceMeasurementProtocolGuid      = { 0xc85d06be, 0x5f75, 0x48ce, { 0xa8, 0x0f, 0x12, 0x36, 0xba, 0x3b, 0x87, 0xb1 } }
   gEdkiiSmmPerformanceMeasurementProtocolGuid   = { 0xd56b6d73, 0x1a7b, 0x4015, { 0x9b, 0xb4, 0x7b, 0x07, 0x17, 0x29, 0xed, 0x24 } }
 
+  ## Bootloader protocol Guid for enabling unaccepted memory support.
+  gEnableUnacceptedMemoryProtocolGuid = { 0xc5a010fe, 0x38a7, 0x4531, { 0x8a, 0x4a, 0x05, 0x00, 0xd2, 0xfd, 0x16, 0x49 } }
+
   ## Guid is defined for CRC32 encapsulation scheme.
   #  Include/Guid/Crc32GuidedSectionExtraction.h
   gEfiCrc32GuidedSectionExtractionGuid = { 0xFC1BCDB0, 0x7D31, 0x49aa, {0x93, 0x6A, 0xA4, 0x60, 0x0D, 0x9D, 0xD0, 0x83 } }
-- 
2.37.3.998.g577e59143f-goog