[PATCH V12 19/47] OvmfPkg/PlatformPei: Move global variables to PlatformInfoHob

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

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

The intention of PlatformInitLib is to extract the common function used
in OvmfPkg/PlatformPei. This lib will be used not only in PEI phase but
also in SEC phase. SEC phase cannot use global variables between
different functions. So PlatformInfoHob is created to hold the
informations shared between functions. For example, HostBridgeDevId
corespond to mHostBridgeDevId in PlatformPei.

In this patch we will first move below global variables to
PlatformInfoHob.
 - mBootMode
 - mS3Supported
 - mPhysMemAddressWidth
 - mMaxCpuCount
 - mHostBridgeDevId
 - mQ35SmramAtDefaultSmbase
 - mQemuUc32Base
 - mS3AcpiReservedMemorySize
 - mS3AcpiReservedMemoryBase

PlatformInfoHob also holds other information, for example,
PciIoBase / PciIoSize. This is because in SEC phase, PcdSetxxx
doesn't work. So we will restruct the functions which set PCDs
into two, one for PlatformInfoLib, one for PlatformPei.

So in this patch we first move global variables and PCDs to
PlatformInfoHob. All the changes are in OvmfPkg/PlatformPei.

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>
Signed-off-by: Min Xu <min.m.xu@intel.com>
---
 OvmfPkg/PlatformPei/AmdSev.c      |   8 +-
 OvmfPkg/PlatformPei/Fv.c          |   4 +-
 OvmfPkg/PlatformPei/MemDetect.c   | 210 +++++++++++++++---------------
 OvmfPkg/PlatformPei/MemTypeInfo.c |   2 +-
 OvmfPkg/PlatformPei/Platform.c    | 109 ++++++++--------
 OvmfPkg/PlatformPei/Platform.h    |  45 ++++---
 6 files changed, 196 insertions(+), 182 deletions(-)

diff --git a/OvmfPkg/PlatformPei/AmdSev.c b/OvmfPkg/PlatformPei/AmdSev.c
index fb7e21ec140f..385562b44c4e 100644
--- a/OvmfPkg/PlatformPei/AmdSev.c
+++ b/OvmfPkg/PlatformPei/AmdSev.c
@@ -228,7 +228,7 @@ AmdSevEsInitialize (
   //   Since the pages must survive across the UEFI to OS transition
   //   make them reserved.
   //
-  GhcbPageCount = mMaxCpuCount * 2;
+  GhcbPageCount = mPlatformInfoHob.PcdCpuMaxLogicalProcessorNumber * 2;
   GhcbBase      = AllocateReservedPages (GhcbPageCount);
   ASSERT (GhcbBase != NULL);
 
@@ -266,7 +266,7 @@ AmdSevEsInitialize (
   // Allocate #VC recursion backup pages. The number of backup pages needed is
   // one less than the maximum VC count.
   //
-  GhcbBackupPageCount = mMaxCpuCount * (VMGEXIT_MAXIMUM_VC_COUNT - 1);
+  GhcbBackupPageCount = mPlatformInfoHob.PcdCpuMaxLogicalProcessorNumber * (VMGEXIT_MAXIMUM_VC_COUNT - 1);
   GhcbBackupBase      = AllocatePages (GhcbBackupPageCount);
   ASSERT (GhcbBackupBase != NULL);
 
@@ -367,7 +367,7 @@ AmdSevInitialize (
   // until after re-encryption, in order to prevent an information leak to the
   // hypervisor.
   //
-  if (FeaturePcdGet (PcdSmmSmramRequire) && (mBootMode != BOOT_ON_S3_RESUME)) {
+  if (mPlatformInfoHob.SmmSmramRequire && (mPlatformInfoHob.BootMode != BOOT_ON_S3_RESUME)) {
     RETURN_STATUS  LocateMapStatus;
     UINTN          MapPagesBase;
     UINTN          MapPagesCount;
@@ -378,7 +378,7 @@ AmdSevInitialize (
                         );
     ASSERT_RETURN_ERROR (LocateMapStatus);
 
-    if (mQ35SmramAtDefaultSmbase) {
+    if (mPlatformInfoHob.Q35SmramAtDefaultSmbase) {
       //
       // The initial SMRAM Save State Map has been covered as part of a larger
       // reserved memory allocation in InitializeRamRegions().
diff --git a/OvmfPkg/PlatformPei/Fv.c b/OvmfPkg/PlatformPei/Fv.c
index 8cd8cacc5913..e40c5922206b 100644
--- a/OvmfPkg/PlatformPei/Fv.c
+++ b/OvmfPkg/PlatformPei/Fv.c
@@ -37,7 +37,7 @@ PeiFvInitialization (
   BuildMemoryAllocationHob (
     PcdGet32 (PcdOvmfPeiMemFvBase),
     PcdGet32 (PcdOvmfPeiMemFvSize),
-    mS3Supported ? EfiACPIMemoryNVS : EfiBootServicesData
+    mPlatformInfoHob.S3Supported ? EfiACPIMemoryNVS : EfiBootServicesData
     );
 
   //
@@ -45,7 +45,7 @@ PeiFvInitialization (
   //
   BuildFvHob (PcdGet32 (PcdOvmfDxeMemFvBase), PcdGet32 (PcdOvmfDxeMemFvSize));
 
-  SecureS3Needed = mS3Supported && FeaturePcdGet (PcdSmmSmramRequire);
+  SecureS3Needed = mPlatformInfoHob.S3Supported && mPlatformInfoHob.SmmSmramRequire;
 
   //
   // Create a memory allocation HOB for the DXE FV.
diff --git a/OvmfPkg/PlatformPei/MemDetect.c b/OvmfPkg/PlatformPei/MemDetect.c
index e5e105f377dd..f3819b997b3b 100644
--- a/OvmfPkg/PlatformPei/MemDetect.c
+++ b/OvmfPkg/PlatformPei/MemDetect.c
@@ -37,21 +37,9 @@ Module Name:
 #include <Library/MtrrLib.h>
 #include <Library/QemuFwCfgLib.h>
 #include <Library/QemuFwCfgSimpleParserLib.h>
-#include <Library/PlatformInitLib.h>
 
 #include "Platform.h"
 
-UINT8  mPhysMemAddressWidth;
-
-STATIC UINT32  mS3AcpiReservedMemoryBase;
-STATIC UINT32  mS3AcpiReservedMemorySize;
-
-STATIC UINT16  mQ35TsegMbytes;
-
-BOOLEAN  mQ35SmramAtDefaultSmbase;
-
-UINT32  mQemuUc32Base;
-
 VOID
 Q35TsegMbytesInitialization (
   VOID
@@ -60,7 +48,7 @@ Q35TsegMbytesInitialization (
   UINT16         ExtendedTsegMbytes;
   RETURN_STATUS  PcdStatus;
 
-  ASSERT (mHostBridgeDevId == INTEL_Q35_MCH_DEVICE_ID);
+  ASSERT (mPlatformInfoHob.HostBridgeDevId == INTEL_Q35_MCH_DEVICE_ID);
 
   //
   // Check if QEMU offers an extended TSEG.
@@ -81,7 +69,7 @@ Q35TsegMbytesInitialization (
   PciWrite16 (DRAMC_REGISTER_Q35 (MCH_EXT_TSEG_MB), MCH_EXT_TSEG_MB_QUERY);
   ExtendedTsegMbytes = PciRead16 (DRAMC_REGISTER_Q35 (MCH_EXT_TSEG_MB));
   if (ExtendedTsegMbytes == MCH_EXT_TSEG_MB_QUERY) {
-    mQ35TsegMbytes = PcdGet16 (PcdQ35TsegMbytes);
+    mPlatformInfoHob.Q35TsegMbytes = PcdGet16 (PcdQ35TsegMbytes);
     return;
   }
 
@@ -93,7 +81,7 @@ Q35TsegMbytesInitialization (
     ));
   PcdStatus = PcdSet16S (PcdQ35TsegMbytes, ExtendedTsegMbytes);
   ASSERT_RETURN_ERROR (PcdStatus);
-  mQ35TsegMbytes = ExtendedTsegMbytes;
+  mPlatformInfoHob.Q35TsegMbytes = ExtendedTsegMbytes;
 }
 
 VOID
@@ -103,9 +91,9 @@ Q35SmramAtDefaultSmbaseInitialization (
 {
   RETURN_STATUS  PcdStatus;
 
-  ASSERT (mHostBridgeDevId == INTEL_Q35_MCH_DEVICE_ID);
+  ASSERT (mPlatformInfoHob.HostBridgeDevId == INTEL_Q35_MCH_DEVICE_ID);
 
-  mQ35SmramAtDefaultSmbase = FALSE;
+  mPlatformInfoHob.Q35SmramAtDefaultSmbase = FALSE;
   if (FeaturePcdGet (PcdCsmEnable)) {
     DEBUG ((
       DEBUG_INFO,
@@ -118,37 +106,36 @@ Q35SmramAtDefaultSmbaseInitialization (
 
     CtlReg = DRAMC_REGISTER_Q35 (MCH_DEFAULT_SMBASE_CTL);
     PciWrite8 (CtlReg, MCH_DEFAULT_SMBASE_QUERY);
-    CtlRegVal                = PciRead8 (CtlReg);
-    mQ35SmramAtDefaultSmbase = (BOOLEAN)(CtlRegVal ==
-                                         MCH_DEFAULT_SMBASE_IN_RAM);
+    CtlRegVal                                = PciRead8 (CtlReg);
+    mPlatformInfoHob.Q35SmramAtDefaultSmbase = (BOOLEAN)(CtlRegVal ==
+                                                         MCH_DEFAULT_SMBASE_IN_RAM);
     DEBUG ((
       DEBUG_INFO,
       "%a: SMRAM at default SMBASE %a\n",
       __FUNCTION__,
-      mQ35SmramAtDefaultSmbase ? "found" : "not found"
+      mPlatformInfoHob.Q35SmramAtDefaultSmbase ? "found" : "not found"
       ));
   }
 
   PcdStatus = PcdSetBoolS (
                 PcdQ35SmramAtDefaultSmbase,
-                mQ35SmramAtDefaultSmbase
+                mPlatformInfoHob.Q35SmramAtDefaultSmbase
                 );
   ASSERT_RETURN_ERROR (PcdStatus);
 }
 
 VOID
 QemuUc32BaseInitialization (
-  VOID
+  IN OUT EFI_HOB_PLATFORM_INFO  *PlatformInfoHob
   )
 {
   UINT32  LowerMemorySize;
-  UINT32  Uc32Size;
 
-  if (mHostBridgeDevId == 0xffff /* microvm */) {
+  if (PlatformInfoHob->HostBridgeDevId == 0xffff /* microvm */) {
     return;
   }
 
-  if (mHostBridgeDevId == INTEL_Q35_MCH_DEVICE_ID) {
+  if (PlatformInfoHob->HostBridgeDevId == INTEL_Q35_MCH_DEVICE_ID) {
     //
     // On q35, the 32-bit area that we'll mark as UC, through variable MTRRs,
     // starts at PcdPciExpressBaseAddress. The platform DSC is responsible for
@@ -157,40 +144,40 @@ QemuUc32BaseInitialization (
     // variable MTRRs (preferably 1 or 2).
     //
     ASSERT (FixedPcdGet64 (PcdPciExpressBaseAddress) <= MAX_UINT32);
-    mQemuUc32Base = (UINT32)FixedPcdGet64 (PcdPciExpressBaseAddress);
+    PlatformInfoHob->Uc32Base = (UINT32)FixedPcdGet64 (PcdPciExpressBaseAddress);
     return;
   }
 
-  if (mHostBridgeDevId == CLOUDHV_DEVICE_ID) {
-    Uc32Size      = CLOUDHV_MMIO_HOLE_SIZE;
-    mQemuUc32Base = CLOUDHV_MMIO_HOLE_ADDRESS;
+  if (PlatformInfoHob->HostBridgeDevId == CLOUDHV_DEVICE_ID) {
+    PlatformInfoHob->Uc32Size = CLOUDHV_MMIO_HOLE_SIZE;
+    PlatformInfoHob->Uc32Base = CLOUDHV_MMIO_HOLE_ADDRESS;
     return;
   }
 
-  ASSERT (mHostBridgeDevId == INTEL_82441_DEVICE_ID);
+  ASSERT (PlatformInfoHob->HostBridgeDevId == INTEL_82441_DEVICE_ID);
   //
   // On i440fx, start with the [LowerMemorySize, 4GB) range. Make sure one
   // variable MTRR suffices by truncating the size to a whole power of two,
   // while keeping the end affixed to 4GB. This will round the base up.
   //
-  LowerMemorySize = GetSystemMemorySizeBelow4gb ();
-  Uc32Size        = GetPowerOfTwo32 ((UINT32)(SIZE_4GB - LowerMemorySize));
-  mQemuUc32Base   = (UINT32)(SIZE_4GB - Uc32Size);
+  LowerMemorySize           = GetSystemMemorySizeBelow4gb (PlatformInfoHob);
+  PlatformInfoHob->Uc32Size = GetPowerOfTwo32 ((UINT32)(SIZE_4GB - LowerMemorySize));
+  PlatformInfoHob->Uc32Base = (UINT32)(SIZE_4GB - PlatformInfoHob->Uc32Size);
   //
   // Assuming that LowerMemorySize is at least 1 byte, Uc32Size is at most 2GB.
   // Therefore mQemuUc32Base is at least 2GB.
   //
-  ASSERT (mQemuUc32Base >= BASE_2GB);
+  ASSERT (PlatformInfoHob->Uc32Base >= BASE_2GB);
 
-  if (mQemuUc32Base != LowerMemorySize) {
+  if (PlatformInfoHob->Uc32Base != LowerMemorySize) {
     DEBUG ((
       DEBUG_VERBOSE,
       "%a: rounded UC32 base from 0x%x up to 0x%x, for "
       "an UC32 size of 0x%x\n",
       __FUNCTION__,
       LowerMemorySize,
-      mQemuUc32Base,
-      Uc32Size
+      PlatformInfoHob->Uc32Base,
+      PlatformInfoHob->Uc32Size
       ));
   }
 }
@@ -385,7 +372,7 @@ GetHighestSystemMemoryAddressFromPvhMemmap (
 
 UINT32
 GetSystemMemorySizeBelow4gb (
-  VOID
+  IN EFI_HOB_PLATFORM_INFO  *PlatformInfoHob
   )
 {
   EFI_STATUS  Status;
@@ -393,7 +380,7 @@ GetSystemMemorySizeBelow4gb (
   UINT8       Cmos0x34;
   UINT8       Cmos0x35;
 
-  if (mHostBridgeDevId == CLOUDHV_DEVICE_ID) {
+  if (PlatformInfoHob->HostBridgeDevId == CLOUDHV_DEVICE_ID) {
     // Get the information from PVH memmap
     return (UINT32)GetHighestSystemMemoryAddressFromPvhMemmap (TRUE);
   }
@@ -448,11 +435,10 @@ GetSystemMemorySizeAbove4gb (
 STATIC
 UINT64
 GetFirstNonAddress (
-  VOID
+  IN OUT  EFI_HOB_PLATFORM_INFO  *PlatformInfoHob
   )
 {
   UINT64                FirstNonAddress;
-  UINT64                Pci64Base, Pci64Size;
   UINT32                FwCfgPciMmio64Mb;
   EFI_STATUS            Status;
   FIRMWARE_CONFIG_ITEM  FwCfgItem;
@@ -493,7 +479,7 @@ GetFirstNonAddress (
   // Otherwise, in order to calculate the highest address plus one, we must
   // consider the 64-bit PCI host aperture too. Fetch the default size.
   //
-  Pci64Size = PcdGet64 (PcdPciMmio64Size);
+  PlatformInfoHob->PcdPciMmio64Size = PcdGet64 (PcdPciMmio64Size);
 
   //
   // See if the user specified the number of megabytes for the 64-bit PCI host
@@ -513,7 +499,7 @@ GetFirstNonAddress (
       break;
     case EFI_SUCCESS:
       if (FwCfgPciMmio64Mb <= 0x1000000) {
-        Pci64Size = LShiftU64 (FwCfgPciMmio64Mb, 20);
+        PlatformInfoHob->PcdPciMmio64Size = LShiftU64 (FwCfgPciMmio64Mb, 20);
         break;
       }
 
@@ -529,8 +515,8 @@ GetFirstNonAddress (
       break;
   }
 
-  if (Pci64Size == 0) {
-    if (mBootMode != BOOT_ON_S3_RESUME) {
+  if (PlatformInfoHob->PcdPciMmio64Size == 0) {
+    if (PlatformInfoHob->BootMode != BOOT_ON_S3_RESUME) {
       DEBUG ((
         DEBUG_INFO,
         "%a: disabling 64-bit PCI host aperture\n",
@@ -577,8 +563,8 @@ GetFirstNonAddress (
   // SeaBIOS aligns both boundaries of the 64-bit PCI host aperture to 1GB, so
   // that the host can map it with 1GB hugepages. Follow suit.
   //
-  Pci64Base = ALIGN_VALUE (FirstNonAddress, (UINT64)SIZE_1GB);
-  Pci64Size = ALIGN_VALUE (Pci64Size, (UINT64)SIZE_1GB);
+  PlatformInfoHob->PcdPciMmio64Base = ALIGN_VALUE (FirstNonAddress, (UINT64)SIZE_1GB);
+  PlatformInfoHob->PcdPciMmio64Size = ALIGN_VALUE (PlatformInfoHob->PcdPciMmio64Size, (UINT64)SIZE_1GB);
 
   //
   // The 64-bit PCI host aperture should also be "naturally" aligned. The
@@ -586,32 +572,32 @@ GetFirstNonAddress (
   // next smaller or equal power of two. That is, align the aperture by the
   // largest BAR size that can fit into it.
   //
-  Pci64Base = ALIGN_VALUE (Pci64Base, GetPowerOfTwo64 (Pci64Size));
+  PlatformInfoHob->PcdPciMmio64Base = ALIGN_VALUE (PlatformInfoHob->PcdPciMmio64Base, GetPowerOfTwo64 (PlatformInfoHob->PcdPciMmio64Size));
 
-  if (mBootMode != BOOT_ON_S3_RESUME) {
+  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, Pci64Base);
+    PcdStatus = PcdSet64S (PcdPciMmio64Base, PlatformInfoHob->PcdPciMmio64Base);
     ASSERT_RETURN_ERROR (PcdStatus);
-    PcdStatus = PcdSet64S (PcdPciMmio64Size, Pci64Size);
+    PcdStatus = PcdSet64S (PcdPciMmio64Size, PlatformInfoHob->PcdPciMmio64Size);
     ASSERT_RETURN_ERROR (PcdStatus);
 
     DEBUG ((
       DEBUG_INFO,
       "%a: Pci64Base=0x%Lx Pci64Size=0x%Lx\n",
       __FUNCTION__,
-      Pci64Base,
-      Pci64Size
+      PlatformInfoHob->PcdPciMmio64Base,
+      PlatformInfoHob->PcdPciMmio64Size
       ));
   }
 
   //
   // The useful address space ends with the 64-bit PCI host aperture.
   //
-  FirstNonAddress = Pci64Base + Pci64Size;
+  FirstNonAddress = PlatformInfoHob->PcdPciMmio64Base + PlatformInfoHob->PcdPciMmio64Size;
   return FirstNonAddress;
 }
 
@@ -620,10 +606,11 @@ GetFirstNonAddress (
 **/
 VOID
 AddressWidthInitialization (
-  VOID
+  IN OUT EFI_HOB_PLATFORM_INFO  *PlatformInfoHob
   )
 {
   UINT64  FirstNonAddress;
+  UINT8   PhysMemAddressWidth;
 
   //
   // As guest-physical memory size grows, the permanent PEI RAM requirements
@@ -631,15 +618,15 @@ 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 ();
-  mPhysMemAddressWidth = (UINT8)HighBitSet64 (FirstNonAddress);
+  FirstNonAddress     = GetFirstNonAddress (PlatformInfoHob);
+  PhysMemAddressWidth = (UINT8)HighBitSet64 (FirstNonAddress);
 
   //
   // If FirstNonAddress is not an integral power of two, then we need an
   // additional bit.
   //
   if ((FirstNonAddress & (FirstNonAddress - 1)) != 0) {
-    ++mPhysMemAddressWidth;
+    ++PhysMemAddressWidth;
   }
 
   //
@@ -648,11 +635,14 @@ AddressWidthInitialization (
   // X64 long mode is 52 bits, but the DXE IPL clamps that down to 48 bits. We
   // can simply assert that here, since 48 bits are good enough for 256 TB.
   //
-  if (mPhysMemAddressWidth <= 36) {
-    mPhysMemAddressWidth = 36;
+  if (PhysMemAddressWidth <= 36) {
+    PhysMemAddressWidth = 36;
   }
 
-  ASSERT (mPhysMemAddressWidth <= 48);
+  ASSERT (PhysMemAddressWidth <= 48);
+
+  PlatformInfoHob->FirstNonAddress     = FirstNonAddress;
+  PlatformInfoHob->PhysMemAddressWidth = PhysMemAddressWidth;
 }
 
 /**
@@ -698,12 +688,12 @@ GetPeiMemoryCap (
     }
   }
 
-  if (mPhysMemAddressWidth <= 39) {
+  if (mPlatformInfoHob.PhysMemAddressWidth <= 39) {
     Pml4Entries = 1;
-    PdpEntries  = 1 << (mPhysMemAddressWidth - 30);
+    PdpEntries  = 1 << (mPlatformInfoHob.PhysMemAddressWidth - 30);
     ASSERT (PdpEntries <= 0x200);
   } else {
-    Pml4Entries = 1 << (mPhysMemAddressWidth - 39);
+    Pml4Entries = 1 << (mPlatformInfoHob.PhysMemAddressWidth - 39);
     ASSERT (Pml4Entries <= 0x200);
     PdpEntries = 512;
   }
@@ -736,38 +726,46 @@ PublishPeiMemory (
   UINT64                MemorySize;
   UINT32                LowerMemorySize;
   UINT32                PeiMemoryCap;
+  UINT32                S3AcpiReservedMemoryBase;
+  UINT32                S3AcpiReservedMemorySize;
 
-  LowerMemorySize = GetSystemMemorySizeBelow4gb ();
-  if (FeaturePcdGet (PcdSmmSmramRequire)) {
+  LowerMemorySize = GetSystemMemorySizeBelow4gb (&mPlatformInfoHob);
+  if (mPlatformInfoHob.SmmSmramRequire) {
     //
     // TSEG is chipped from the end of low RAM
     //
-    LowerMemorySize -= mQ35TsegMbytes * SIZE_1MB;
+    LowerMemorySize -= mPlatformInfoHob.Q35TsegMbytes * SIZE_1MB;
   }
 
+  S3AcpiReservedMemoryBase = 0;
+  S3AcpiReservedMemorySize = 0;
+
   //
   // If S3 is supported, then the S3 permanent PEI memory is placed next,
   // downwards. Its size is primarily dictated by CpuMpPei. The formula below
   // is an approximation.
   //
-  if (mS3Supported) {
-    mS3AcpiReservedMemorySize = SIZE_512KB +
-                                mMaxCpuCount *
-                                PcdGet32 (PcdCpuApStackSize);
-    mS3AcpiReservedMemoryBase = LowerMemorySize - mS3AcpiReservedMemorySize;
-    LowerMemorySize           = mS3AcpiReservedMemoryBase;
+  if (mPlatformInfoHob.S3Supported) {
+    S3AcpiReservedMemorySize = SIZE_512KB +
+                               mPlatformInfoHob.PcdCpuMaxLogicalProcessorNumber *
+                               PcdGet32 (PcdCpuApStackSize);
+    S3AcpiReservedMemoryBase = LowerMemorySize - S3AcpiReservedMemorySize;
+    LowerMemorySize          = S3AcpiReservedMemoryBase;
   }
 
-  if (mBootMode == BOOT_ON_S3_RESUME) {
-    MemoryBase = mS3AcpiReservedMemoryBase;
-    MemorySize = mS3AcpiReservedMemorySize;
+  mPlatformInfoHob.S3AcpiReservedMemoryBase = S3AcpiReservedMemoryBase;
+  mPlatformInfoHob.S3AcpiReservedMemorySize = S3AcpiReservedMemorySize;
+
+  if (mPlatformInfoHob.BootMode == BOOT_ON_S3_RESUME) {
+    MemoryBase = S3AcpiReservedMemoryBase;
+    MemorySize = S3AcpiReservedMemorySize;
   } else {
     PeiMemoryCap = GetPeiMemoryCap ();
     DEBUG ((
       DEBUG_INFO,
       "%a: mPhysMemAddressWidth=%d PeiMemoryCap=%u KB\n",
       __FUNCTION__,
-      mPhysMemAddressWidth,
+      mPlatformInfoHob.PhysMemAddressWidth,
       PeiMemoryCap >> 10
       ));
 
@@ -781,7 +779,7 @@ PublishPeiMemory (
     // allocation HOB, and other allocations served from the permanent PEI RAM
     // shouldn't overlap with that HOB.
     //
-    MemoryBase = mS3Supported && FeaturePcdGet (PcdSmmSmramRequire) ?
+    MemoryBase = mPlatformInfoHob.S3Supported && mPlatformInfoHob.SmmSmramRequire ?
                  PcdGet32 (PcdOvmfDecompressionScratchEnd) :
                  PcdGet32 (PcdOvmfDxeMemFvBase) + PcdGet32 (PcdOvmfDxeMemFvSize);
     MemorySize = LowerMemorySize - MemoryBase;
@@ -796,7 +794,7 @@ PublishPeiMemory (
   // normal boot permanent PEI RAM. Regarding the S3 boot path, the S3
   // permanent PEI RAM is located even higher.
   //
-  if (FeaturePcdGet (PcdSmmSmramRequire) && mQ35SmramAtDefaultSmbase) {
+  if (mPlatformInfoHob.SmmSmramRequire && mPlatformInfoHob.Q35SmramAtDefaultSmbase) {
     ASSERT (SMM_DEFAULT_SMBASE + MCH_DEFAULT_SMBASE_SIZE <= MemoryBase);
   }
 
@@ -812,10 +810,10 @@ PublishPeiMemory (
 STATIC
 VOID
 QemuInitializeRamBelow1gb (
-  VOID
+  IN EFI_HOB_PLATFORM_INFO  *PlatformInfoHob
   )
 {
-  if (FeaturePcdGet (PcdSmmSmramRequire) && mQ35SmramAtDefaultSmbase) {
+  if (PlatformInfoHob->SmmSmramRequire && PlatformInfoHob->Q35SmramAtDefaultSmbase) {
     PlatformAddMemoryRangeHob (0, SMM_DEFAULT_SMBASE);
     PlatformAddReservedMemoryBaseSizeHob (
       SMM_DEFAULT_SMBASE,
@@ -842,7 +840,7 @@ QemuInitializeRamBelow1gb (
 STATIC
 VOID
 QemuInitializeRam (
-  VOID
+  IN EFI_HOB_PLATFORM_INFO  *PlatformInfoHob
   )
 {
   UINT64         LowerMemorySize;
@@ -855,9 +853,9 @@ QemuInitializeRam (
   //
   // Determine total memory size available
   //
-  LowerMemorySize = GetSystemMemorySizeBelow4gb ();
+  LowerMemorySize = GetSystemMemorySizeBelow4gb (PlatformInfoHob);
 
-  if (mBootMode == BOOT_ON_S3_RESUME) {
+  if (PlatformInfoHob->BootMode == BOOT_ON_S3_RESUME) {
     //
     // Create the following memory HOB as an exception on the S3 boot path.
     //
@@ -878,17 +876,17 @@ QemuInitializeRam (
     // allocation HOBs, and to honor preexistent memory allocation HOBs when
     // looking for an area to borrow.
     //
-    QemuInitializeRamBelow1gb ();
+    QemuInitializeRamBelow1gb (PlatformInfoHob);
   } else {
     //
     // Create memory HOBs
     //
-    QemuInitializeRamBelow1gb ();
+    QemuInitializeRamBelow1gb (PlatformInfoHob);
 
-    if (FeaturePcdGet (PcdSmmSmramRequire)) {
+    if (PlatformInfoHob->SmmSmramRequire) {
       UINT32  TsegSize;
 
-      TsegSize = mQ35TsegMbytes * SIZE_1MB;
+      TsegSize = PlatformInfoHob->Q35TsegMbytes * SIZE_1MB;
       PlatformAddMemoryRangeHob (BASE_1MB, LowerMemorySize - TsegSize);
       PlatformAddReservedMemoryBaseSizeHob (
         LowerMemorySize - TsegSize,
@@ -924,7 +922,7 @@ QemuInitializeRam (
   // practically any alignment, and we may not have enough variable MTRRs to
   // cover it exactly.
   //
-  if (IsMtrrSupported () && (mHostBridgeDevId != CLOUDHV_DEVICE_ID)) {
+  if (IsMtrrSupported () && (PlatformInfoHob->HostBridgeDevId != CLOUDHV_DEVICE_ID)) {
     MtrrGetAllMtrrs (&MtrrSettings);
 
     //
@@ -957,8 +955,8 @@ QemuInitializeRam (
     // MMIO aperture on i440fx, PCIEXBAR on q35) to 4GB as uncacheable.
     //
     Status = MtrrSetMemoryAttribute (
-               mQemuUc32Base,
-               SIZE_4GB - mQemuUc32Base,
+               PlatformInfoHob->Uc32Base,
+               SIZE_4GB - PlatformInfoHob->Uc32Base,
                CacheUncacheable
                );
     ASSERT_EFI_ERROR (Status);
@@ -971,20 +969,20 @@ QemuInitializeRam (
 **/
 VOID
 InitializeRamRegions (
-  VOID
+  IN EFI_HOB_PLATFORM_INFO  *PlatformInfoHob
   )
 {
-  QemuInitializeRam ();
+  QemuInitializeRam (PlatformInfoHob);
 
   SevInitializeRam ();
 
-  if (mS3Supported && (mBootMode != BOOT_ON_S3_RESUME)) {
+  if (PlatformInfoHob->S3Supported && (PlatformInfoHob->BootMode != BOOT_ON_S3_RESUME)) {
     //
     // This is the memory range that will be used for PEI on S3 resume
     //
     BuildMemoryAllocationHob (
-      mS3AcpiReservedMemoryBase,
-      mS3AcpiReservedMemorySize,
+      PlatformInfoHob->S3AcpiReservedMemoryBase,
+      PlatformInfoHob->S3AcpiReservedMemorySize,
       EfiACPIMemoryNVS
       );
 
@@ -1021,7 +1019,7 @@ InitializeRamRegions (
       EfiACPIMemoryNVS
       );
 
-    if (MemEncryptSevEsIsEnabled ()) {
+    if (PlatformInfoHob->SevEsIsEnabled) {
       //
       // If SEV-ES is enabled, reserve the GHCB-related memory area. This
       // includes the extra page table used to break down the 2MB page
@@ -1051,8 +1049,8 @@ InitializeRamRegions (
  #endif
   }
 
-  if (mBootMode != BOOT_ON_S3_RESUME) {
-    if (!FeaturePcdGet (PcdSmmSmramRequire)) {
+  if (PlatformInfoHob->BootMode != BOOT_ON_S3_RESUME) {
+    if (!PlatformInfoHob->SmmSmramRequire) {
       //
       // Reserve the lock box storage area
       //
@@ -1070,20 +1068,20 @@ InitializeRamRegions (
       BuildMemoryAllocationHob (
         (EFI_PHYSICAL_ADDRESS)(UINTN)PcdGet32 (PcdOvmfLockBoxStorageBase),
         (UINT64)(UINTN)PcdGet32 (PcdOvmfLockBoxStorageSize),
-        mS3Supported ? EfiACPIMemoryNVS : EfiBootServicesData
+        PlatformInfoHob->S3Supported ? EfiACPIMemoryNVS : EfiBootServicesData
         );
     }
 
-    if (FeaturePcdGet (PcdSmmSmramRequire)) {
+    if (PlatformInfoHob->SmmSmramRequire) {
       UINT32  TsegSize;
 
       //
       // Make sure the TSEG area that we reported as a reserved memory resource
       // cannot be used for reserved memory allocations.
       //
-      TsegSize = mQ35TsegMbytes * SIZE_1MB;
+      TsegSize = PlatformInfoHob->Q35TsegMbytes * SIZE_1MB;
       BuildMemoryAllocationHob (
-        GetSystemMemorySizeBelow4gb () - TsegSize,
+        GetSystemMemorySizeBelow4gb (PlatformInfoHob) - TsegSize,
         TsegSize,
         EfiReservedMemoryType
         );
@@ -1091,7 +1089,7 @@ InitializeRamRegions (
       // Similarly, allocate away the (already reserved) SMRAM at the default
       // SMBASE, if it exists.
       //
-      if (mQ35SmramAtDefaultSmbase) {
+      if (PlatformInfoHob->Q35SmramAtDefaultSmbase) {
         BuildMemoryAllocationHob (
           SMM_DEFAULT_SMBASE,
           MCH_DEFAULT_SMBASE_SIZE,
@@ -1115,7 +1113,7 @@ InitializeRamRegions (
       BuildMemoryAllocationHob (
         (EFI_PHYSICAL_ADDRESS)(UINTN)FixedPcdGet32 (PcdOvmfWorkAreaBase),
         (UINT64)(UINTN)FixedPcdGet32 (PcdOvmfWorkAreaSize),
-        mS3Supported ? EfiACPIMemoryNVS : EfiBootServicesData
+        PlatformInfoHob->S3Supported ? EfiACPIMemoryNVS : EfiBootServicesData
         );
     }
 
diff --git a/OvmfPkg/PlatformPei/MemTypeInfo.c b/OvmfPkg/PlatformPei/MemTypeInfo.c
index fc5ccfaf113d..c8fcf1732687 100644
--- a/OvmfPkg/PlatformPei/MemTypeInfo.c
+++ b/OvmfPkg/PlatformPei/MemTypeInfo.c
@@ -208,7 +208,7 @@ MemTypeInfoInitialization (
 {
   EFI_STATUS  Status;
 
-  if (!FeaturePcdGet (PcdSmmSmramRequire)) {
+  if (!mPlatformInfoHob.SmmSmramRequire) {
     //
     // EFI_PEI_READ_ONLY_VARIABLE2_PPI will never be available; install
     // the default memory type information HOB right away.
diff --git a/OvmfPkg/PlatformPei/Platform.c b/OvmfPkg/PlatformPei/Platform.c
index 62480c3c40e5..80eb4cc9adcd 100644
--- a/OvmfPkg/PlatformPei/Platform.c
+++ b/OvmfPkg/PlatformPei/Platform.c
@@ -36,11 +36,13 @@
 #include <IndustryStandard/Pci22.h>
 #include <IndustryStandard/Q35MchIch9.h>
 #include <IndustryStandard/QemuCpuHotplug.h>
-#include <Library/PlatformInitLib.h>
+#include <Library/MemEncryptSevLib.h>
 #include <OvmfPlatforms.h>
 
 #include "Platform.h"
 
+EFI_HOB_PLATFORM_INFO  mPlatformInfoHob = { 0 };
+
 EFI_PEI_PPI_DESCRIPTOR  mPpiBootMode[] = {
   {
     EFI_PEI_PPI_DESCRIPTOR_PPI | EFI_PEI_PPI_DESCRIPTOR_TERMINATE_LIST,
@@ -49,17 +51,9 @@ EFI_PEI_PPI_DESCRIPTOR  mPpiBootMode[] = {
   }
 };
 
-UINT16  mHostBridgeDevId;
-
-EFI_BOOT_MODE  mBootMode = BOOT_WITH_FULL_CONFIGURATION;
-
-BOOLEAN  mS3Supported = FALSE;
-
-UINT32  mMaxCpuCount;
-
 VOID
 MemMapInitialization (
-  VOID
+  IN OUT EFI_HOB_PLATFORM_INFO  *PlatformInfoHob
   )
 {
   UINT64         PciIoBase;
@@ -78,16 +72,16 @@ MemMapInitialization (
   //
   PlatformAddIoMemoryRangeHob (0x0A0000, BASE_1MB);
 
-  if (mHostBridgeDevId == 0xffff /* microvm */) {
+  if (PlatformInfoHob->HostBridgeDevId == 0xffff /* microvm */) {
     PlatformAddIoMemoryBaseSizeHob (MICROVM_GED_MMIO_BASE, SIZE_4KB);
     PlatformAddIoMemoryBaseSizeHob (0xFEC00000, SIZE_4KB); /* ioapic #1 */
     PlatformAddIoMemoryBaseSizeHob (0xFEC10000, SIZE_4KB); /* ioapic #2 */
     return;
   }
 
-  TopOfLowRam  = GetSystemMemorySizeBelow4gb ();
+  TopOfLowRam  = GetSystemMemorySizeBelow4gb (PlatformInfoHob);
   PciExBarBase = 0;
-  if (mHostBridgeDevId == INTEL_Q35_MCH_DEVICE_ID) {
+  if (PlatformInfoHob->HostBridgeDevId == INTEL_Q35_MCH_DEVICE_ID) {
     //
     // The MMCONFIG area is expected to fall between the top of low RAM and
     // the base of the 32-bit PCI host aperture.
@@ -97,8 +91,8 @@ MemMapInitialization (
     ASSERT (PciExBarBase <= MAX_UINT32 - SIZE_256MB);
     PciBase = (UINT32)(PciExBarBase + SIZE_256MB);
   } else {
-    ASSERT (TopOfLowRam <= mQemuUc32Base);
-    PciBase = mQemuUc32Base;
+    ASSERT (TopOfLowRam <= PlatformInfoHob->Uc32Base);
+    PciBase = PlatformInfoHob->Uc32Base;
   }
 
   //
@@ -121,9 +115,12 @@ MemMapInitialization (
   PcdStatus = PcdSet64S (PcdPciMmio32Size, PciSize);
   ASSERT_RETURN_ERROR (PcdStatus);
 
+  PlatformInfoHob->PcdPciMmio32Base = PciBase;
+  PlatformInfoHob->PcdPciMmio32Size = PciSize;
+
   PlatformAddIoMemoryBaseSizeHob (0xFEC00000, SIZE_4KB);
   PlatformAddIoMemoryBaseSizeHob (0xFED00000, SIZE_1KB);
-  if (mHostBridgeDevId == INTEL_Q35_MCH_DEVICE_ID) {
+  if (PlatformInfoHob->HostBridgeDevId == INTEL_Q35_MCH_DEVICE_ID) {
     PlatformAddIoMemoryBaseSizeHob (ICH9_ROOT_COMPLEX_BASE, SIZE_16KB);
     //
     // Note: there should be an
@@ -160,7 +157,7 @@ MemMapInitialization (
   // On Q35, the IO Port space is available for PCI resource allocations from
   // 0x6000 up.
   //
-  if (mHostBridgeDevId == INTEL_Q35_MCH_DEVICE_ID) {
+  if (PlatformInfoHob->HostBridgeDevId == INTEL_Q35_MCH_DEVICE_ID) {
     PciIoBase = 0x6000;
     PciIoSize = 0xA000;
     ASSERT ((ICH9_PMBASE_VALUE & 0xF000) < PciIoBase);
@@ -180,6 +177,9 @@ MemMapInitialization (
   ASSERT_RETURN_ERROR (PcdStatus);
   PcdStatus = PcdSet64S (PcdPciIoSize, PciIoSize);
   ASSERT_RETURN_ERROR (PcdStatus);
+
+  PlatformInfoHob->PcdPciIoBase = PciIoBase;
+  PlatformInfoHob->PcdPciIoSize = PciIoSize;
 }
 
 #define UPDATE_BOOLEAN_PCD_FROM_FW_CFG(TokenName)                   \
@@ -306,7 +306,7 @@ MicrovmInitialization (
 
 VOID
 MiscInitialization (
-  VOID
+  IN EFI_HOB_PLATFORM_INFO  *PlatformInfoHob
   )
 {
   UINTN          PmCmd;
@@ -327,12 +327,12 @@ MiscInitialization (
   // of IO space. (Side note: unlike other HOBs, the CPU HOB is needed during
   // S3 resume as well, so we build it unconditionally.)
   //
-  BuildCpuHob (mPhysMemAddressWidth, 16);
+  BuildCpuHob (PlatformInfoHob->PhysMemAddressWidth, 16);
 
   //
   // Determine platform type and save Host Bridge DID to PCD
   //
-  switch (mHostBridgeDevId) {
+  switch (PlatformInfoHob->HostBridgeDevId) {
     case INTEL_82441_DEVICE_ID:
       PmCmd      = POWER_MGMT_REGISTER_PIIX4 (PCI_COMMAND_OFFSET);
       Pmba       = POWER_MGMT_REGISTER_PIIX4 (PIIX4_PMBA);
@@ -371,13 +371,13 @@ MiscInitialization (
         DEBUG_ERROR,
         "%a: Unknown Host Bridge Device ID: 0x%04x\n",
         __FUNCTION__,
-        mHostBridgeDevId
+        PlatformInfoHob->HostBridgeDevId
         ));
       ASSERT (FALSE);
       return;
   }
 
-  PcdStatus = PcdSet16S (PcdOvmfHostBridgePciDevId, mHostBridgeDevId);
+  PcdStatus = PcdSet16S (PcdOvmfHostBridgePciDevId, PlatformInfoHob->HostBridgeDevId);
   ASSERT_RETURN_ERROR (PcdStatus);
 
   //
@@ -403,7 +403,7 @@ MiscInitialization (
     PciOr8 (AcpiCtlReg, AcpiEnBit);
   }
 
-  if (mHostBridgeDevId == INTEL_Q35_MCH_DEVICE_ID) {
+  if (PlatformInfoHob->HostBridgeDevId == INTEL_Q35_MCH_DEVICE_ID) {
     //
     // Set Root Complex Register Block BAR
     //
@@ -421,18 +421,18 @@ MiscInitialization (
 
 VOID
 BootModeInitialization (
-  VOID
+  IN OUT EFI_HOB_PLATFORM_INFO  *PlatformInfoHob
   )
 {
   EFI_STATUS  Status;
 
   if (PlatformCmosRead8 (0xF) == 0xFE) {
-    mBootMode = BOOT_ON_S3_RESUME;
+    PlatformInfoHob->BootMode = BOOT_ON_S3_RESUME;
   }
 
   PlatformCmosWrite8 (0xF, 0x00);
 
-  Status = PeiServicesSetBootMode (mBootMode);
+  Status = PeiServicesSetBootMode (PlatformInfoHob->BootMode);
   ASSERT_EFI_ERROR (Status);
 
   Status = PeiServicesInstallPpi (mPpiBootMode);
@@ -473,7 +473,7 @@ S3Verification (
   )
 {
  #if defined (MDE_CPU_X64)
-  if (FeaturePcdGet (PcdSmmSmramRequire) && mS3Supported) {
+  if (mPlatformInfoHob.SmmSmramRequire && mPlatformInfoHob.S3Supported) {
     DEBUG ((
       DEBUG_ERROR,
       "%a: S3Resume2Pei doesn't support X64 PEI + SMM yet.\n",
@@ -501,7 +501,7 @@ Q35BoardVerification (
   VOID
   )
 {
-  if (mHostBridgeDevId == INTEL_Q35_MCH_DEVICE_ID) {
+  if (mPlatformInfoHob.HostBridgeDevId == INTEL_Q35_MCH_DEVICE_ID) {
     return;
   }
 
@@ -510,7 +510,7 @@ Q35BoardVerification (
     "%a: no TSEG (SMRAM) on host bridge DID=0x%04x; "
     "only DID=0x%04x (Q35) is supported\n",
     __FUNCTION__,
-    mHostBridgeDevId,
+    mPlatformInfoHob.HostBridgeDevId,
     INTEL_Q35_MCH_DEVICE_ID
     ));
   ASSERT (FALSE);
@@ -523,10 +523,11 @@ Q35BoardVerification (
 **/
 VOID
 MaxCpuCountInitialization (
-  VOID
+  IN OUT EFI_HOB_PLATFORM_INFO  *PlatformInfoHob
   )
 {
   UINT16         BootCpuCount;
+  UINT32         MaxCpuCount;
   RETURN_STATUS  PcdStatus;
 
   //
@@ -542,7 +543,7 @@ MaxCpuCountInitialization (
     // first).
     //
     DEBUG ((DEBUG_WARN, "%a: boot CPU count unavailable\n", __FUNCTION__));
-    mMaxCpuCount = PcdGet32 (PcdCpuMaxLogicalProcessorNumber);
+    MaxCpuCount = PlatformInfoHob->DefaultMaxCpuNumber;
   } else {
     //
     // We will expose BootCpuCount to MpInitLib. MpInitLib will count APs up to
@@ -553,7 +554,7 @@ MaxCpuCountInitialization (
     UINTN   CpuHpBase;
     UINT32  CmdData2;
 
-    CpuHpBase = ((mHostBridgeDevId == INTEL_Q35_MCH_DEVICE_ID) ?
+    CpuHpBase = ((PlatformInfoHob->HostBridgeDevId == INTEL_Q35_MCH_DEVICE_ID) ?
                  ICH9_CPU_HOTPLUG_BASE : PIIX4_CPU_HOTPLUG_BASE);
 
     //
@@ -605,7 +606,7 @@ MaxCpuCountInitialization (
         "%a: modern CPU hotplug interface unavailable\n",
         __FUNCTION__
         ));
-      mMaxCpuCount = BootCpuCount;
+      MaxCpuCount = BootCpuCount;
     } else {
       //
       // Grab the possible CPU count from the modern CPU hotplug interface.
@@ -671,23 +672,26 @@ MaxCpuCountInitialization (
         BootCpuCount = (UINT16)Present;
       }
 
-      mMaxCpuCount = Possible;
+      MaxCpuCount = Possible;
     }
   }
 
   DEBUG ((
     DEBUG_INFO,
-    "%a: BootCpuCount=%d mMaxCpuCount=%u\n",
+    "%a: BootCpuCount=%d MaxCpuCount=%u\n",
     __FUNCTION__,
     BootCpuCount,
-    mMaxCpuCount
+    MaxCpuCount
     ));
-  ASSERT (BootCpuCount <= mMaxCpuCount);
+  ASSERT (BootCpuCount <= MaxCpuCount);
 
   PcdStatus = PcdSet32S (PcdCpuBootLogicalProcessorNumber, BootCpuCount);
   ASSERT_RETURN_ERROR (PcdStatus);
-  PcdStatus = PcdSet32S (PcdCpuMaxLogicalProcessorNumber, mMaxCpuCount);
+  PcdStatus = PcdSet32S (PcdCpuMaxLogicalProcessorNumber, MaxCpuCount);
   ASSERT_RETURN_ERROR (PcdStatus);
+
+  PlatformInfoHob->PcdCpuMaxLogicalProcessorNumber  = MaxCpuCount;
+  PlatformInfoHob->PcdCpuBootLogicalProcessorNumber = BootCpuCount;
 }
 
 /**
@@ -710,27 +714,30 @@ InitializePlatform (
 
   DEBUG ((DEBUG_INFO, "Platform PEIM Loaded\n"));
 
+  mPlatformInfoHob.SmmSmramRequire = FeaturePcdGet (PcdSmmSmramRequire);
+  mPlatformInfoHob.SevEsIsEnabled  = MemEncryptSevEsIsEnabled ();
+
   PlatformDebugDumpCmos ();
 
   if (QemuFwCfgS3Enabled ()) {
     DEBUG ((DEBUG_INFO, "S3 support was detected on QEMU\n"));
-    mS3Supported = TRUE;
-    Status       = PcdSetBoolS (PcdAcpiS3Enable, TRUE);
+    mPlatformInfoHob.S3Supported = TRUE;
+    Status                       = PcdSetBoolS (PcdAcpiS3Enable, TRUE);
     ASSERT_EFI_ERROR (Status);
   }
 
   S3Verification ();
-  BootModeInitialization ();
-  AddressWidthInitialization ();
+  BootModeInitialization (&mPlatformInfoHob);
+  AddressWidthInitialization (&mPlatformInfoHob);
 
   //
   // Query Host Bridge DID
   //
-  mHostBridgeDevId = PciRead16 (OVMF_HOSTBRIDGE_DID);
+  mPlatformInfoHob.HostBridgeDevId = PciRead16 (OVMF_HOSTBRIDGE_DID);
 
-  MaxCpuCountInitialization ();
+  MaxCpuCountInitialization (&mPlatformInfoHob);
 
-  if (FeaturePcdGet (PcdSmmSmramRequire)) {
+  if (mPlatformInfoHob.SmmSmramRequire) {
     Q35BoardVerification ();
     Q35TsegMbytesInitialization ();
     Q35SmramAtDefaultSmbaseInitialization ();
@@ -738,24 +745,24 @@ InitializePlatform (
 
   PublishPeiMemory ();
 
-  QemuUc32BaseInitialization ();
+  QemuUc32BaseInitialization (&mPlatformInfoHob);
 
-  InitializeRamRegions ();
+  InitializeRamRegions (&mPlatformInfoHob);
 
-  if (mBootMode != BOOT_ON_S3_RESUME) {
-    if (!FeaturePcdGet (PcdSmmSmramRequire)) {
+  if (mPlatformInfoHob.BootMode != BOOT_ON_S3_RESUME) {
+    if (!mPlatformInfoHob.SmmSmramRequire) {
       ReserveEmuVariableNvStore ();
     }
 
     PeiFvInitialization ();
     MemTypeInfoInitialization ();
-    MemMapInitialization ();
+    MemMapInitialization (&mPlatformInfoHob);
     NoexecDxeInitialization ();
   }
 
   InstallClearCacheCallback ();
   AmdSevInitialize ();
-  MiscInitialization ();
+  MiscInitialization (&mPlatformInfoHob);
   InstallFeatureControlCallback ();
 
   return EFI_SUCCESS;
diff --git a/OvmfPkg/PlatformPei/Platform.h b/OvmfPkg/PlatformPei/Platform.h
index f193ff736549..ff4459d79fe4 100644
--- a/OvmfPkg/PlatformPei/Platform.h
+++ b/OvmfPkg/PlatformPei/Platform.h
@@ -10,10 +10,13 @@
 #define _PLATFORM_PEI_H_INCLUDED_
 
 #include <IndustryStandard/E820.h>
+#include <Library/PlatformInitLib.h>
+
+extern EFI_HOB_PLATFORM_INFO  mPlatformInfoHob;
 
 VOID
 AddressWidthInitialization (
-  VOID
+  IN OUT EFI_HOB_PLATFORM_INFO  *PlatformInfoHob
   );
 
 VOID
@@ -33,17 +36,37 @@ PublishPeiMemory (
 
 UINT32
 GetSystemMemorySizeBelow4gb (
-  VOID
+  IN EFI_HOB_PLATFORM_INFO  *PlatformInfoHob
   );
 
 VOID
 QemuUc32BaseInitialization (
-  VOID
+  IN OUT EFI_HOB_PLATFORM_INFO  *PlatformInfoHob
   );
 
 VOID
 InitializeRamRegions (
-  VOID
+  IN EFI_HOB_PLATFORM_INFO  *PlatformInfoHob
+  );
+
+VOID
+MemMapInitialization (
+  IN OUT EFI_HOB_PLATFORM_INFO  *PlatformInfoHob
+  );
+
+VOID
+MiscInitialization (
+  IN EFI_HOB_PLATFORM_INFO  *PlatformInfoHob
+  );
+
+VOID
+BootModeInitialization (
+  IN OUT EFI_HOB_PLATFORM_INFO  *PlatformInfoHob
+  );
+
+VOID
+MaxCpuCountInitialization (
+  IN OUT EFI_HOB_PLATFORM_INFO  *PlatformInfoHob
   );
 
 EFI_STATUS
@@ -71,23 +94,9 @@ AmdSevInitialize (
   VOID
   );
 
-extern EFI_BOOT_MODE  mBootMode;
-
 VOID
 SevInitializeRam (
   VOID
   );
 
-extern BOOLEAN  mS3Supported;
-
-extern UINT8  mPhysMemAddressWidth;
-
-extern UINT32  mMaxCpuCount;
-
-extern UINT16  mHostBridgeDevId;
-
-extern BOOLEAN  mQ35SmramAtDefaultSmbase;
-
-extern UINT32  mQemuUc32Base;
-
 #endif // _PLATFORM_PEI_H_INCLUDED_
-- 
2.29.2.windows.2