//C:\udk2\OvmfPkg\TestByMy\PeiTest\MyPpiPeimA\MyPpiPeimA.inf
//C:\udk2\OvmfPkg\TestByMy\PeiTest\MyPpiPeimA\MyPpiPeimA.c

#include <Uefi/UefiBaseType.h>

#include <Pi/PiPeiCis.h>
#include <Ppi/MyFirstPeiLib.h>

#include <Library/PeimEntryPoint.h>
#include <Library/DebugLib.h>
#include <Library/BaseLib.h>
#include <Library/PeiServicesLib.h>

extern EFI_GUID gMyFirstPpiGuid;

EFI_STATUS
EFIAPI
NotifiMyDriverCallBack (
  IN EFI_PEI_SERVICES          **PeiServices,
  IN EFI_PEI_NOTIFY_DESCRIPTOR *NotifyDesc,
  IN VOID                      *Ppi
  )
{
  UINTN                         Temp;
  
  for(Temp = 0; Temp <= 5; Temp++) {
    DEBUG ((DEBUG_INFO, "\n"));
  }

  DEBUG ((DEBUG_INFO, "Ppi Peim A is install!..\n"));

  return EFI_SUCCESS;
}

EFI_MYPPI_STR               InstallMy = {
                              PrintHelloMesg
                              };

EFI_PEI_NOTIFY_DESCRIPTOR   PpiMySetNotif = {
                             (EFI_PEI_PPI_DESCRIPTOR_NOTIFY_CALLBACK | EFI_PEI_PPI_DESCRIPTOR_TERMINATE_LIST),
                              &gMyFirstPpiGuid,
                              &NotifiMyDriverCallBack
                              };

EFI_PEI_PPI_DESCRIPTOR      PpiMySet = {
                             (EFI_PEI_PPI_DESCRIPTOR_PPI | EFI_PEI_PPI_DESCRIPTOR_TERMINATE_LIST),
                              &gMyFirstPpiGuid,
                              &InstallMy
                              };


EFI_STATUS
EFIAPI
MyPpiPeimAEntry(
  IN       EFI_PEI_FILE_HANDLE  FileHandle,
  IN CONST EFI_PEI_SERVICES     **PeiServices
)
{
  EFI_STATUS                    Status;
  UINTN                         Temp;
  
  for(Temp = 0; Temp <= 5; Temp++) {
    DEBUG ((DEBUG_INFO, "\n"));
  }
  
  DEBUG ((DEBUG_INFO, "MyPpiPeimA is Start..\n"));

  Status = PeiServicesNotifyPpi  (&PpiMySetNotif);
  ASSERT_EFI_ERROR (Status);

  Status = PeiServicesInstallPpi  (&PpiMySet);
  ASSERT_EFI_ERROR (Status);

  DEBUG ((DEBUG_INFO, "MyPpiPeimA is End..\n"));

  return Status;
}

MyPpiPeimA.inf

[Defines]
  INF_VERSION                    = 0x00010005
  BASE_NAME                      = MyPpiPeimA
  FILE_GUID                      = 2D6F6BC2-9681-8E11-8579-B57DCD006011
  MODULE_TYPE                    = PEIM
  VERSION_STRING                 = 1.0
  ENTRY_POINT                    = MyPpiPeimAEntry

[Sources]
  MyPpiPeimA.c

[Packages]
  MdePkg/MdePkg.dec
  MdeModulePkg/MdeModulePkg.dec
  OvmfPkg/OvmfPkg.dec
[LibraryClasses]
  PeimEntryPoint
  DebugLib
  BaseLib
  MyFirstPeiLib
  PeiServicesLib

[Ppis]
  gMyFirstPpiGuid

[Depex]
  TRUE

//C:\udk2\OvmfPkg\OvmfPkg.dec
[Ppis]
  gMyFirstPpiGuid                = { 0xE113F897, 0x75CF, 0xF630, { 0x81, 0x7F, 0xC8, 0x5A, 0x79, 0xE8, 0xAE, 0x66 } }

MyPpiPeimB.c

#include <Uefi/UefiBaseType.h>

#include <Pi/PiPeiCis.h>
#include <Ppi/MyFirstPeiLib.h>

#include <Library/PeimEntryPoint.h>
#include <Library/DebugLib.h>
#include <Library/BaseLib.h>
#include <Library/PeiServicesLib.h>

extern EFI_GUID gMyFirstPpiGuid;

EFI_STATUS
EFIAPI
MyPpiPeimBEntry(
  IN       EFI_PEI_FILE_HANDLE  FileHandle,
  IN CONST EFI_PEI_SERVICES     **PeiServices
)
{
  EFI_STATUS                    Status;
  UINTN                         Temp;
  EFI_MYPPI_STR                 *LocatePpiMy;
  
  for(Temp = 0; Temp <= 5; Temp++) {
    DEBUG ((DEBUG_INFO, "\n"));
  }
  
  DEBUG ((DEBUG_INFO, "MyPpiPeimB is Start..\n"));

  Status = PeiServicesLocatePpi (
             &gMyFirstPpiGuid,
             0,
             NULL,
             (VOID **)&LocatePpiMy
             );
  ASSERT_EFI_ERROR (Status);
  LocatePpiMy->PrintMesg(L"My Locate PPI to printf Hello World in MyPpiPeimB ...\n");

  DEBUG ((DEBUG_INFO, "MyPpiPeimB is End..\n"));

  return Status;
}

MyPpiPeimB.inf

[Defines]
  INF_VERSION                    = 0x00010005
  BASE_NAME                      = MyPpiPeimB
  FILE_GUID                      = 2D6F6232-9622-8E11-8579-B57DCD006011
  MODULE_TYPE                    = PEIM
  VERSION_STRING                 = 1.0
  ENTRY_POINT                    = MyPpiPeimBEntry

[Sources]
  MyPpiPeimB.c

[Packages]
  MdePkg/MdePkg.dec
  MdeModulePkg/MdeModulePkg.dec
  OvmfPkg/OvmfPkg.dec

[LibraryClasses]
  PeimEntryPoint
  DebugLib
  BaseLib
  MyFirstPeiLib
  PeiServicesLib

[Ppis]
  gMyFirstPpiGuid

[Depex]
  gMyFirstPpiGuid

OvmfPkgX64.dsc

//C:\udk2\OvmfPkg\OvmfPkgX64.dsc
 OvmfPkg/TestByMy/PeiTest/MyPpiPeimA/MyPpiPeimA.inf
  OvmfPkg/TestByMy/PeiTest/MyPpiPeimB/MyPpiPeimB.inf

OvmfPkgX64.fdf

//C:\udk2\OvmfPkg\OvmfPkgX64.fdf
INF  OvmfPkg/TestByMy/PeiTest/MyPpiPeimA/MyPpiPeimA.inf
INF  OvmfPkg/TestByMy/PeiTest/MyPpiPeimB/MyPpiPeimB.inf