OvmfPkg/PlatformDxe: register log buffer as efi config table

If a memory debug log buffer is present, register the buffer location as
config table so the OS can find and show it.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>

OvmfPkg/PlatformDxe/Platform.c

@@ -13,6 +13,8 @@
 #include <Library/DebugLib.h>
 #include <Library/DevicePathLib.h>
 #include <Library/HiiLib.h>
+#include <Library/HobLib.h>
+#include <Library/MemDebugLogLib.h>
 #include <Library/MemoryAllocationLib.h>
 #include <Library/PrintLib.h>
 #include <Library/UefiBootServicesTableLib.h>
@@ -943,6 +945,28 @@ GopInstalled (
   mGopTracker = NULL;
 }
 
+/**
+  If a memory debug log buffer is present, register the buffer location as
+  config table so the OS can find and show it.
+**/
+VOID
+EFIAPI
+MemDebugLogInstallTable (
+  VOID
+  )
+{
+  EFI_HOB_GUID_TYPE       *GuidHob;
+  MEM_DEBUG_LOG_HOB_DATA  *HobData;
+  VOID                    *LogBuffer;
+
+  GuidHob = GetFirstGuidHob (&gMemDebugLogHobGuid);
+  if (GuidHob != NULL) {
+    HobData   = (MEM_DEBUG_LOG_HOB_DATA *)GET_GUID_HOB_DATA (GuidHob);
+    LogBuffer = (VOID *)(UINTN)HobData->MemDebugLogBufAddr;
+    gBS->InstallConfigurationTable (&gMemDebugLogHobGuid, LogBuffer);
+  }
+}
+
 /**
   Entry point for this driver.
 
@@ -1030,6 +1054,8 @@ PlatformInit (
   Status = gBS->SignalEvent (mGopEvent);
   ASSERT_EFI_ERROR (Status);
 
+  MemDebugLogInstallTable ();
+
   return EFI_SUCCESS;
 
 CloseGopEvent:

OvmfPkg/PlatformDxe/Platform.inf

@@ -36,6 +36,7 @@
   DebugLib
   DevicePathLib
   HiiLib
+  HobLib
   MemoryAllocationLib
   PrintLib
   UefiBootServicesTableLib
@@ -59,6 +60,7 @@
 [Guids]
   gEfiIfrTianoGuid
   gOvmfPlatformConfigGuid
+  gMemDebugLogHobGuid
 
 [Depex]
   gEfiHiiConfigRoutingProtocolGuid  AND