From da1ccea67ce0fa58dd934abc5535443d7197004b Mon Sep 17 00:00:00 2001
From: Sami Mujawar <sami.mujawar@arm.com>
Date: Sat, 23 May 2026 14:14:05 +0100
Subject: [PATCH] OvmfPkg/FdtPciHostBridgeLib: Map PCI MMIO windows in GCD

Map the PCI MMIO32 and MMIO64 windows into the GCD memory
map after parsing the DT ranges property.

This makes the PCI memory apertures available as MMIO
regions.

Signed-off-by: Sami Mujawar <sami.mujawar@arm.com>
---
 .../FdtPciHostBridgeLib/FdtPciHostBridgeLib.c    | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/OvmfPkg/Fdt/FdtPciHostBridgeLib/FdtPciHostBridgeLib.c b/OvmfPkg/Fdt/FdtPciHostBridgeLib/FdtPciHostBridgeLib.c
index 4912355999..783ce27f30 100644
--- a/OvmfPkg/Fdt/FdtPciHostBridgeLib/FdtPciHostBridgeLib.c
+++ b/OvmfPkg/Fdt/FdtPciHostBridgeLib/FdtPciHostBridgeLib.c
@@ -297,6 +297,22 @@ ProcessPciHost (
     //
     Status = MapMmioMemory (*IoBase + IoTranslation, *IoSize, EFI_MEMORY_UC);
     ASSERT_EFI_ERROR (Status);
+    if (EFI_ERROR (Status)) {
+      return Status;
+    }
+  }
+
+  if (*Mmio32Size != 0) {
+    Status = MapMmioMemory (*Mmio32Base, *Mmio32Size, EFI_MEMORY_UC);
+    ASSERT_EFI_ERROR (Status);
+    if (EFI_ERROR (Status)) {
+      return Status;
+    }
+  }
+
+  if (*Mmio64Size != 0) {
+    Status = MapMmioMemory (*Mmio64Base, *Mmio64Size, EFI_MEMORY_UC);
+    ASSERT_EFI_ERROR (Status);
   }
 
   return Status;