OvmfPkg/PlatformPei: Refactor AddressWidthInitialization

BZ: https://bugzilla.tianocore.org/show_bug.cgi?id=3863

From this patch we start to restruct the functions which set PCDs into
two, one for PlatformInitLib, one for PlatformPei.

AddressWidthInitialization is the first one. It is splitted into two:
 - PlatformAddressWidthInitialization is for PlatformInitLib
 - AddressWidthInitialization is for PlatformPei. It calls
   PlatformAddressWidthInitialization then set PCDs.

Below functions are also refined for PlatformInitLib:
 - PlatformScanOrAdd64BitE820Ram
 - PlatformGetSystemMemorySizeAbove4gb
 - PlatformGetFirstNonAddress

All the SetPcd codes are removed from above functions.

Cc: Ard Biesheuvel <ardb+tianocore@kernel.org>
Cc: Jordan Justen <jordan.l.justen@intel.com>
Cc: Brijesh Singh <brijesh.singh@amd.com>
Cc: Erdem Aktas <erdemaktas@google.com>
Cc: James Bottomley <jejb@linux.ibm.com>
Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Tom Lendacky <thomas.lendacky@amd.com>
Cc: Gerd Hoffmann <kraxel@redhat.com>
Cc: Sebastien Boeuf <sebastien.boeuf@intel.com>
Acked-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Jiewen Yao <jiewen.yao@intel.com>
Signed-off-by: Min Xu <min.m.xu@intel.com>

OvmfPkg/PlatformPei/MemDetect.c

@@ -189,7 +189,7 @@ QemuUc32BaseInitialization (
   Find the highest exclusive >=4GB RAM address, or produce memory resource
   descriptor HOBs for RAM entries that start at or above 4GB.
 
-  @param[out] MaxAddress  If MaxAddress is NULL, then ScanOrAdd64BitE820Ram()
+  @param[out] MaxAddress  If MaxAddress is NULL, then PlatformScanOrAdd64BitE820Ram()
                           produces memory resource descriptor HOBs for RAM
                           entries that start at or above 4GB.
 
@@ -210,7 +210,7 @@ QemuUc32BaseInitialization (
 **/
 STATIC
 EFI_STATUS
-ScanOrAdd64BitE820Ram (
+PlatformScanOrAdd64BitE820Ram (
   IN BOOLEAN  AddHighHob,
   OUT UINT64  *LowMemory OPTIONAL,
   OUT UINT64  *MaxAddress OPTIONAL
@@ -385,7 +385,7 @@ GetSystemMemorySizeBelow4gb (
     return (UINT32)GetHighestSystemMemoryAddressFromPvhMemmap (TRUE);
   }
 
-  Status = ScanOrAdd64BitE820Ram (FALSE, &LowerMemorySize, NULL);
+  Status = PlatformScanOrAdd64BitE820Ram (FALSE, &LowerMemorySize, NULL);
   if ((Status == EFI_SUCCESS) && (LowerMemorySize > 0)) {
     return (UINT32)LowerMemorySize;
   }
@@ -407,7 +407,7 @@ GetSystemMemorySizeBelow4gb (
 
 STATIC
 UINT64
-GetSystemMemorySizeAbove4gb (
+PlatformGetSystemMemorySizeAbove4gb (
   )
 {
   UINT32  Size;
@@ -434,7 +434,7 @@ GetSystemMemorySizeAbove4gb (
 **/
 STATIC
 UINT64
-GetFirstNonAddress (
+PlatformGetFirstNonAddress (
   IN OUT  EFI_HOB_PLATFORM_INFO  *PlatformInfoHob
   )
 {
@@ -444,7 +444,6 @@ GetFirstNonAddress (
   FIRMWARE_CONFIG_ITEM  FwCfgItem;
   UINTN                 FwCfgSize;
   UINT64                HotPlugMemoryEnd;
-  RETURN_STATUS         PcdStatus;
 
   //
   // set FirstNonAddress to suppress incorrect compiler/analyzer warnings
@@ -458,9 +457,9 @@ GetFirstNonAddress (
   // Otherwise, get the flat size of the memory above 4GB from the CMOS (which
   // can only express a size smaller than 1TB), and add it to 4GB.
   //
-  Status = ScanOrAdd64BitE820Ram (FALSE, NULL, &FirstNonAddress);
+  Status = PlatformScanOrAdd64BitE820Ram (FALSE, NULL, &FirstNonAddress);
   if (EFI_ERROR (Status)) {
-    FirstNonAddress = BASE_4GB + GetSystemMemorySizeAbove4gb ();
+    FirstNonAddress = BASE_4GB + PlatformGetSystemMemorySizeAbove4gb ();
   }
 
   //
@@ -475,12 +474,6 @@ GetFirstNonAddress (
 
  #endif
 
-  //
-  // Otherwise, in order to calculate the highest address plus one, we must
-  // consider the 64-bit PCI host aperture too. Fetch the default size.
-  //
-  PlatformInfoHob->PcdPciMmio64Size = PcdGet64 (PcdPciMmio64Size);
-
   //
   // See if the user specified the number of megabytes for the 64-bit PCI host
   // aperture. Accept an aperture size up to 16TB.
@@ -522,8 +515,6 @@ GetFirstNonAddress (
         "%a: disabling 64-bit PCI host aperture\n",
         __FUNCTION__
         ));
-      PcdStatus = PcdSet64S (PcdPciMmio64Size, 0);
-      ASSERT_RETURN_ERROR (PcdStatus);
     }
 
     //
@@ -574,26 +565,6 @@ GetFirstNonAddress (
   //
   PlatformInfoHob->PcdPciMmio64Base = ALIGN_VALUE (PlatformInfoHob->PcdPciMmio64Base, GetPowerOfTwo64 (PlatformInfoHob->PcdPciMmio64Size));
 
-  if (PlatformInfoHob->BootMode != BOOT_ON_S3_RESUME) {
-    //
-    // The core PciHostBridgeDxe driver will automatically add this range to
-    // the GCD memory space map through our PciHostBridgeLib instance; here we
-    // only need to set the PCDs.
-    //
-    PcdStatus = PcdSet64S (PcdPciMmio64Base, PlatformInfoHob->PcdPciMmio64Base);
-    ASSERT_RETURN_ERROR (PcdStatus);
-    PcdStatus = PcdSet64S (PcdPciMmio64Size, PlatformInfoHob->PcdPciMmio64Size);
-    ASSERT_RETURN_ERROR (PcdStatus);
-
-    DEBUG ((
-      DEBUG_INFO,
-      "%a: Pci64Base=0x%Lx Pci64Size=0x%Lx\n",
-      __FUNCTION__,
-      PlatformInfoHob->PcdPciMmio64Base,
-      PlatformInfoHob->PcdPciMmio64Size
-      ));
-  }
-
   //
   // The useful address space ends with the 64-bit PCI host aperture.
   //
@@ -602,10 +573,11 @@ GetFirstNonAddress (
 }
 
 /**
-  Initialize the mPhysMemAddressWidth variable, based on guest RAM size.
+  Initialize the PhysMemAddressWidth field in PlatformInfoHob based on guest RAM size.
 **/
 VOID
-AddressWidthInitialization (
+EFIAPI
+PlatformAddressWidthInitialization (
   IN OUT EFI_HOB_PLATFORM_INFO  *PlatformInfoHob
   )
 {
@@ -618,7 +590,7 @@ AddressWidthInitialization (
   // The DXL IPL keys off of the physical address bits advertized in the CPU
   // HOB. To conserve memory, we calculate the minimum address width here.
   //
-  FirstNonAddress     = GetFirstNonAddress (PlatformInfoHob);
+  FirstNonAddress     = PlatformGetFirstNonAddress (PlatformInfoHob);
   PhysMemAddressWidth = (UINT8)HighBitSet64 (FirstNonAddress);
 
   //
@@ -645,6 +617,65 @@ AddressWidthInitialization (
   PlatformInfoHob->PhysMemAddressWidth = PhysMemAddressWidth;
 }
 
+/**
+  Initialize the PhysMemAddressWidth field in PlatformInfoHob based on guest RAM size.
+**/
+VOID
+AddressWidthInitialization (
+  IN OUT EFI_HOB_PLATFORM_INFO  *PlatformInfoHob
+  )
+{
+  RETURN_STATUS  PcdStatus;
+
+  PlatformAddressWidthInitialization (PlatformInfoHob);
+
+  //
+  // If DXE is 32-bit, then we're done; PciBusDxe will degrade 64-bit MMIO
+  // resources to 32-bit anyway. See DegradeResource() in
+  // "PciResourceSupport.c".
+  //
+ #ifdef MDE_CPU_IA32
+  if (!FeaturePcdGet (PcdDxeIplSwitchToLongMode)) {
+    return;
+  }
+
+ #endif
+
+  if (PlatformInfoHob->PcdPciMmio64Size == 0) {
+    if (PlatformInfoHob->BootMode != BOOT_ON_S3_RESUME) {
+      DEBUG ((
+        DEBUG_INFO,
+        "%a: disabling 64-bit PCI host aperture\n",
+        __FUNCTION__
+        ));
+      PcdStatus = PcdSet64S (PcdPciMmio64Size, 0);
+      ASSERT_RETURN_ERROR (PcdStatus);
+    }
+
+    return;
+  }
+
+  if (PlatformInfoHob->BootMode != BOOT_ON_S3_RESUME) {
+    //
+    // The core PciHostBridgeDxe driver will automatically add this range to
+    // the GCD memory space map through our PciHostBridgeLib instance; here we
+    // only need to set the PCDs.
+    //
+    PcdStatus = PcdSet64S (PcdPciMmio64Base, PlatformInfoHob->PcdPciMmio64Base);
+    ASSERT_RETURN_ERROR (PcdStatus);
+    PcdStatus = PcdSet64S (PcdPciMmio64Size, PlatformInfoHob->PcdPciMmio64Size);
+    ASSERT_RETURN_ERROR (PcdStatus);
+
+    DEBUG ((
+      DEBUG_INFO,
+      "%a: Pci64Base=0x%Lx Pci64Size=0x%Lx\n",
+      __FUNCTION__,
+      PlatformInfoHob->PcdPciMmio64Base,
+      PlatformInfoHob->PcdPciMmio64Size
+      ));
+  }
+}
+
 /**
   Calculate the cap for the permanent PEI memory.
 **/
@@ -704,7 +735,7 @@ GetPeiMemoryCap (
 
   //
   // Add 64 MB for miscellaneous allocations. Note that for
-  // mPhysMemAddressWidth values close to 36, the cap will actually be
+  // PhysMemAddressWidth values close to 36, the cap will actually be
   // dominated by this increment.
   //
   return (UINT32)(EFI_PAGES_TO_SIZE (TotalPages) + SIZE_64MB);
@@ -763,7 +794,7 @@ PublishPeiMemory (
     PeiMemoryCap = GetPeiMemoryCap ();
     DEBUG ((
       DEBUG_INFO,
-      "%a: mPhysMemAddressWidth=%d PeiMemoryCap=%u KB\n",
+      "%a: PhysMemAddressWidth=%d PeiMemoryCap=%u KB\n",
       __FUNCTION__,
       mPlatformInfoHob.PhysMemAddressWidth,
       PeiMemoryCap >> 10
@@ -902,9 +933,9 @@ QemuInitializeRam (
     // entries. Otherwise, create a single memory HOB with the flat >=4GB
     // memory size read from the CMOS.
     //
-    Status = ScanOrAdd64BitE820Ram (TRUE, NULL, NULL);
+    Status = PlatformScanOrAdd64BitE820Ram (TRUE, NULL, NULL);
     if (EFI_ERROR (Status)) {
-      UpperMemorySize = GetSystemMemorySizeAbove4gb ();
+      UpperMemorySize = PlatformGetSystemMemorySizeAbove4gb ();
       if (UpperMemorySize != 0) {
         PlatformAddMemoryBaseSizeHob (BASE_4GB, UpperMemorySize);
       }

OvmfPkg/PlatformPei/Platform.c

@@ -734,8 +734,10 @@ InitializePlatform (
 
   DEBUG ((DEBUG_INFO, "Platform PEIM Loaded\n"));
 
-  mPlatformInfoHob.SmmSmramRequire = FeaturePcdGet (PcdSmmSmramRequire);
+  mPlatformInfoHob.SmmSmramRequire     = FeaturePcdGet (PcdSmmSmramRequire);
-  mPlatformInfoHob.SevEsIsEnabled  = MemEncryptSevEsIsEnabled ();
+  mPlatformInfoHob.SevEsIsEnabled      = MemEncryptSevEsIsEnabled ();
+  mPlatformInfoHob.PcdPciMmio64Size    = PcdGet64 (PcdPciMmio64Size);
+  mPlatformInfoHob.DefaultMaxCpuNumber = PcdGet32 (PcdCpuMaxLogicalProcessorNumber);
 
   PlatformDebugDumpCmos ();