StandaloneMmPkg: StandaloneMmIplPei: Use MM access to open the regions

Current MM IPL in PEI phase does not open the MMRAM regions through MM
access PPI. This is causing some platforms like OVMF reading all `0xFF`s
when trying to relocate the Standalone MM core.

This change opens all the MMRAM regions provided by MM access PPI and
closes + locks the regions after initial MM foundation setup, when MM
Access PPI is available.

Platforms that require MM access PPI can inject depex through libraries.

Signed-off-by: Kun Qin <[email protected]>
(cherry picked from commit 73b0b5e)

Author: kuqin12

StandaloneMmPkg/Drivers/StandaloneMmIplPei/StandaloneMmIplPei.c

@@ -664,6 +664,10 @@ ExecuteMmCoreFromMmram (
   PE_COFF_LOADER_IMAGE_CONTEXT          ImageContext;
   STANDALONE_MM_FOUNDATION_ENTRY_POINT  Entry;
   EFI_MMRAM_HOB_DESCRIPTOR_BLOCK        *Block;
+  EFI_PEI_MM_ACCESS_PPI                 *MmAccess;
+  UINTN                                 Size;
+  UINTN                                 Index;
+  UINTN                                 MmramRangeCount;
 
   MmFvBase = 0;
   MmFvSize = 0;
@@ -673,6 +677,40 @@ ExecuteMmCoreFromMmram (
   Status = LocateMmCoreFv (&MmFvBase, &MmFvSize, &MmCoreFileName, &ImageContext.Handle);
   ASSERT_EFI_ERROR (Status);
 
+  //
+  // Prepare an MM access PPI for MM RAM.
+  //
+  MmAccess        = NULL;
+  MmramRangeCount = 0;
+  Status          = PeiServicesLocatePpi (
+                      &gEfiPeiMmAccessPpiGuid,
+                      0,
+                      NULL,
+                      (VOID **)&MmAccess
+                      );
+  if (!EFI_ERROR (Status)) {
+    //
+    // Open all MMRAM ranges, if MmAccess is available.
+    //
+    Size   = 0;
+    Status = MmAccess->GetCapabilities ((EFI_PEI_SERVICES **)GetPeiServicesTablePointer (), MmAccess, &Size, NULL);
+    if (Status != EFI_BUFFER_TOO_SMALL) {
+      // This is not right...
+      ASSERT (Status == EFI_BUFFER_TOO_SMALL);
+      return EFI_DEVICE_ERROR;
+    }
+
+    MmramRangeCount = Size / sizeof (EFI_MMRAM_DESCRIPTOR);
+    for (Index = 0; Index < MmramRangeCount; Index++) {
+      Status = MmAccess->Open ((EFI_PEI_SERVICES **)GetPeiServicesTablePointer (), MmAccess, Index);
+      if (EFI_ERROR (Status)) {
+        DEBUG ((DEBUG_ERROR, "MM IPL failed to open MMRAM windows index %d - %r\n", Index, Status));
+        ASSERT_EFI_ERROR (Status);
+        goto Done;
+      }
+    }
+  }
+
   //
   // Initialize ImageContext
   //
@@ -683,7 +721,7 @@ ExecuteMmCoreFromMmram (
   //
   Status = PeCoffLoaderGetImageInfo (&ImageContext);
   if (EFI_ERROR (Status)) {
-    return Status;
+    goto Done;
   }
 
   PageCount = (UINTN)EFI_SIZE_TO_PAGES ((UINTN)ImageContext.ImageSize + ImageContext.SectionAlignment);
@@ -693,7 +731,8 @@ ExecuteMmCoreFromMmram (
   //
   ImageContext.ImageAddress = MmIplAllocateMmramPage (PageCount, &Block);
   if (ImageContext.ImageAddress == 0) {
-    return EFI_NOT_FOUND;
+    Status = EFI_NOT_FOUND;
+    goto Done;
   }
 
   //
@@ -756,6 +795,44 @@ ExecuteMmCoreFromMmram (
     }
   }
 
+Done:
+  if (MmAccess != NULL) {
+    //
+    // Close all MMRAM ranges, if MmAccess is available.
+    //
+    for (Index = 0; Index < MmramRangeCount; Index++) {
+      Status = MmAccess->Close ((EFI_PEI_SERVICES **)GetPeiServicesTablePointer (), MmAccess, Index);
+      if (EFI_ERROR (Status)) {
+        DEBUG ((DEBUG_ERROR, "MM IPL failed to close MMRAM windows index %d - %r\n", Index, Status));
+        ASSERT (FALSE);
+        return Status;
+      }
+
+      //
+      // Print debug message that the MMRAM window is now closed.
+      //
+      DEBUG ((DEBUG_INFO, "MM IPL closed MMRAM window index %d\n", Index));
+
+      //
+      // Lock the MMRAM (Note: Locking MMRAM may not be supported on all platforms)
+      //
+      Status = MmAccess->Lock ((EFI_PEI_SERVICES **)GetPeiServicesTablePointer (), MmAccess, Index);
+      if (EFI_ERROR (Status)) {
+        //
+        // Print error message that the MMRAM failed to lock...
+        //
+        DEBUG ((DEBUG_ERROR, "MM IPL could not lock MMRAM (Index %d) after executing MM Core %r\n", Index, Status));
+        ASSERT (FALSE);
+        return Status;
+      }
+
+      //
+      // Print debug message that the MMRAM window is now closed.
+      //
+      DEBUG ((DEBUG_INFO, "MM IPL locked MMRAM window index %d\n", Index));
+    }
+  }
+
   return Status;
 }
 

StandaloneMmPkg/Drivers/StandaloneMmIplPei/StandaloneMmIplPei.h

@@ -21,6 +21,7 @@
 #include <Library/PeCoffLib.h>
 #include <Library/CacheMaintenanceLib.h>
 #include <Library/PeiServicesTablePointerLib.h>
+#include <Ppi/MmAccess.h>
 #include <Ppi/MmControl.h>
 #include <Ppi/MmCommunication.h>
 #include <Ppi/MmCommunication3.h>

StandaloneMmPkg/Drivers/StandaloneMmIplPei/StandaloneMmIplPei.inf

@@ -65,6 +65,7 @@
   gEfiPeiMmCommunication3PpiGuid
   gEfiEndOfPeiSignalPpiGuid
   gMmCoreFvLocationPpiGuid
+  gEfiPeiMmAccessPpiGuid
 
 [Protocols]
   gEfiMmEndOfPeiProtocol