[PATCH V1 2/3] OvmfPkg/PeilessStartupLib: Update ConstructFwHobList for lazy-accept

["Min Xu" <min.m.xu@intel.com>]

From: Min M Xu <min.m.xu@intel.com>

BZ: https://bugzilla.tianocore.org/show_bug.cgi?id=4181

ConstructFwHobList once searched the accepted memory under 4G. This
need to be updated because of PcdAcceptMemoryEndAddress. If
PcdAcceptMemoryEndAddress is less than 4G, we should search the memory
under PcdAcceptMemoryEndAddress.

Cc: Erdem Aktas <erdemaktas@google.com>
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>
Signed-off-by: Min Xu <min.m.xu@intel.com>
---
 OvmfPkg/Library/PeilessStartupLib/Hob.c       | 25 +++++++++++++------
 .../PeilessStartupLib/PeilessStartupLib.inf   |  1 +
 2 files changed, 19 insertions(+), 7 deletions(-)

diff --git a/OvmfPkg/Library/PeilessStartupLib/Hob.c b/OvmfPkg/Library/PeilessStartupLib/Hob.c
index 630ce445ebec..8ea7a68343ed 100644
--- a/OvmfPkg/Library/PeilessStartupLib/Hob.c
+++ b/OvmfPkg/Library/PeilessStartupLib/Hob.c
@@ -74,17 +74,23 @@ ConstructFwHobList (
   )
 {
   EFI_PEI_HOB_POINTERS  Hob;
+  EFI_PHYSICAL_ADDRESS  PhysicalStart;
   EFI_PHYSICAL_ADDRESS  PhysicalEnd;
   UINT64                ResourceLength;
   EFI_PHYSICAL_ADDRESS  LowMemoryStart;
   UINT64                LowMemoryLength;
+  EFI_PHYSICAL_ADDRESS  AcceptMemoryEndAddress;
 
   ASSERT (VmmHobList != NULL);
 
   Hob.Raw = (UINT8 *)VmmHobList;
 
-  LowMemoryLength = 0;
-  LowMemoryStart  = 0;
+  LowMemoryLength        = 0;
+  LowMemoryStart         = 0;
+  AcceptMemoryEndAddress = FixedPcdGet64 (PcdAcceptMemoryEndAddress);
+  if ((AcceptMemoryEndAddress == 0) || (AcceptMemoryEndAddress > SIZE_4GB)) {
+    AcceptMemoryEndAddress = SIZE_4GB;
+  }
 
   //
   // Parse the HOB list until end of list or matching type is found.
@@ -92,16 +98,21 @@ ConstructFwHobList (
   while (!END_OF_HOB_LIST (Hob)) {
     if (Hob.Header->HobType == EFI_HOB_TYPE_RESOURCE_DESCRIPTOR) {
       if (Hob.ResourceDescriptor->ResourceType == BZ3937_EFI_RESOURCE_MEMORY_UNACCEPTED) {
-        PhysicalEnd    = Hob.ResourceDescriptor->PhysicalStart + Hob.ResourceDescriptor->ResourceLength;
+        PhysicalStart  = Hob.ResourceDescriptor->PhysicalStart;
+        PhysicalEnd    = PhysicalStart + Hob.ResourceDescriptor->ResourceLength;
         ResourceLength = Hob.ResourceDescriptor->ResourceLength;
 
-        if (PhysicalEnd <= BASE_4GB) {
+        if (PhysicalEnd >= AcceptMemoryEndAddress) {
+          ResourceLength = AcceptMemoryEndAddress - PhysicalStart;
+        }
+
+        if (PhysicalStart >= AcceptMemoryEndAddress) {
+          break;
+        } else {
           if (ResourceLength > LowMemoryLength) {
             LowMemoryStart  = Hob.ResourceDescriptor->PhysicalStart;
             LowMemoryLength = ResourceLength;
           }
-        } else {
-          break;
         }
       }
     }
@@ -110,7 +121,7 @@ ConstructFwHobList (
   }
 
   if (LowMemoryLength == 0) {
-    DEBUG ((DEBUG_ERROR, "Cannot find a memory region under 4GB for Fw hoblist.\n"));
+    DEBUG ((DEBUG_ERROR, "Cannot find a memory region under 0x%llx for Fw hoblist.\n", AcceptMemoryEndAddress));
     return EFI_NOT_FOUND;
   }
 
diff --git a/OvmfPkg/Library/PeilessStartupLib/PeilessStartupLib.inf b/OvmfPkg/Library/PeilessStartupLib/PeilessStartupLib.inf
index def50b4b019e..644facb60074 100644
--- a/OvmfPkg/Library/PeilessStartupLib/PeilessStartupLib.inf
+++ b/OvmfPkg/Library/PeilessStartupLib/PeilessStartupLib.inf
@@ -88,3 +88,4 @@
   gEfiMdeModulePkgTokenSpaceGuid.PcdNullPointerDetectionPropertyMask    ## CONSUMES
   gUefiOvmfPkgTokenSpaceGuid.PcdOvmfDxeMemFvBase
   gUefiOvmfPkgTokenSpaceGuid.PcdOvmfDxeMemFvSize
+  gUefiOvmfPkgTokenSpaceGuid.PcdAcceptMemoryEndAddress
-- 
2.29.2.windows.2