MdeModulePkg: PciHostBridgeDxe: don't assume extended config space

The "pc" ("pc-i440fx-*") machine types of QEMU don't support extended
config space. Accordingly, OVMF will use the following library instances
in connection with the core PciHostBridgeDxe driver:

  BasePciSegmentLibPci [class: PciSegmentLib]
    BasePciLibCf8      [class: PciLib]
      BasePciCf8Lib    [class: PciCf8Lib]

Add a new field to the PCI_ROOT_BRIDGE structure so that
RootBridgeIoCheckParameter() can catch config space offsets above 0xFF on
such old (emulated) platforms.

Cc: Ruiyu Ni <ruiyu.ni@intel.com>
Cc: Jordan Justen <jordan.l.justen@intel.com>
Cc: Marcel Apfelbaum <marcel@redhat.com>
Cc: Michael Kinney <michael.d.kinney@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Michael Kinney <michael.d.kinney@intel.com>
Reviewed-by: Jordan Justen <jordan.l.justen@intel.com>
Reviewed-by: Marcel Apfelbaum <marcel@redhat.com>
Reviewed-by: Ruiyu Ni <ruiyu.ni@intel.com>

MdeModulePkg/Bus/Pci/PciHostBridgeDxe/PciRootBridge.h

@@ -72,6 +72,7 @@ typedef struct {
   PCI_ROOT_BRIDGE_APERTURE          MemAbove4G;
   PCI_ROOT_BRIDGE_APERTURE          PMemAbove4G;
   BOOLEAN                           DmaAbove4G;
+  BOOLEAN                           NoExtendedConfigSpace;
   VOID                              *ConfigBuffer;
   EFI_DEVICE_PATH_PROTOCOL          *DevicePath;
   CHAR16                            *DevicePathStr;

MdeModulePkg/Bus/Pci/PciHostBridgeDxe/PciRootBridgeIo.c

@@ -80,6 +80,7 @@ CreateRootBridge (
   DEBUG ((EFI_D_INFO, "%s\n", DevicePathStr = ConvertDevicePathToText (Bridge->DevicePath, FALSE, FALSE)));
   DEBUG ((EFI_D_INFO, "  Support/Attr: %lx / %lx\n", Bridge->Supports, Bridge->Attributes));
   DEBUG ((EFI_D_INFO, "    DmaAbove4G: %s\n", Bridge->DmaAbove4G ? L"Yes" : L"No"));
+  DEBUG ((EFI_D_INFO, "NoExtConfSpace: %s\n", Bridge->NoExtendedConfigSpace ? L"Yes" : L"No"));
   DEBUG ((EFI_D_INFO, "     AllocAttr: %lx (%s%s)\n", Bridge->AllocationAttributes,
           (Bridge->AllocationAttributes & EFI_PCI_HOST_BRIDGE_COMBINE_MEM_PMEM) != 0 ? L"CombineMemPMem " : L"",
           (Bridge->AllocationAttributes & EFI_PCI_HOST_BRIDGE_MEM64_DECODE) != 0 ? L"Mem64Decode" : L""
@@ -155,6 +156,7 @@ CreateRootBridge (
   RootBridge->Supports = Bridge->Supports;
   RootBridge->Attributes = Bridge->Attributes;
   RootBridge->DmaAbove4G = Bridge->DmaAbove4G;
+  RootBridge->NoExtendedConfigSpace = Bridge->NoExtendedConfigSpace;
   RootBridge->AllocationAttributes = Bridge->AllocationAttributes;
   RootBridge->DevicePath = DuplicateDevicePath (Bridge->DevicePath);
   RootBridge->DevicePathStr = DevicePathStr;
@@ -351,7 +353,7 @@ RootBridgeIoCheckParameter (
       Address = PciRbAddr->Register;
     }
     Base = 0;
-    Limit = 0xFFF;
+    Limit = RootBridge->NoExtendedConfigSpace ? 0xFF : 0xFFF;
   }
 
   if (Address < Base) {

MdeModulePkg/Include/Library/PciHostBridgeLib.h

@@ -34,6 +34,10 @@ typedef struct {
                                                   ///< and SetAttributes() in EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL.
   BOOLEAN                  DmaAbove4G;            ///< DMA above 4GB memory.
                                                   ///< Set to TRUE when root bridge supports DMA above 4GB memory.
+  BOOLEAN                  NoExtendedConfigSpace; ///< When FALSE, the root bridge supports
+                                                  ///< Extended (4096-byte) Configuration Space.
+                                                  ///< When TRUE, the root bridge supports
+                                                  ///< 256-byte Configuration Space only.
   UINT64                   AllocationAttributes;  ///< Allocation attributes.
                                                   ///< Refer to EFI_PCI_HOST_BRIDGE_COMBINE_MEM_PMEM and
                                                   ///< EFI_PCI_HOST_BRIDGE_MEM64_DECODE used by GetAllocAttributes()