[PATCH v2] UefiCpuPkg: support single EFI_PEI_CORE_FV_LOCATION_PPI in PpiList

["Chiu, Chasel" <chasel.chiu@intel.com>]

REF: https://bugzilla.tianocore.org/show_bug.cgi?id=2153

Current logic will skip searching EFI_PEI_CORE_FV_LOCATION_PPI when the
PPI in PpiList having EFI_PEI_PPI_DESCRIPTOR_TERMINATE_LIST flag,
but platform may pass single PPI in PpiList that should be supported.

Changed the logic to verify PpiList first before checking
EFI_PEI_PPI_DESCRIPTOR_TERMINATE_LIST flag.

Test: Verified both single EFI_PEI_CORE_FV_LOCATION_PPI and multiple
      PPIs in PpiList cases and both can boot with the PeiCore
      specified by EFI_PEI_CORE_FV_LOCATION_PPI.

Cc: Eric Dong <eric.dong@intel.com>
Cc: Ray Ni <ray.ni@intel.com>
Cc: Laszlo Ersek <lersek@redhat.com>
Signed-off-by: Chasel Chiu <chasel.chiu@intel.com>
---
 UefiCpuPkg/SecCore/SecMain.c | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

diff --git a/UefiCpuPkg/SecCore/SecMain.c b/UefiCpuPkg/SecCore/SecMain.c
index 66c952b897..5d5e7f17dc 100644
--- a/UefiCpuPkg/SecCore/SecMain.c
+++ b/UefiCpuPkg/SecCore/SecMain.c
@@ -238,9 +238,8 @@ SecStartupPhase2(
   // is enabled.
   //
   if (PpiList != NULL) {
-    for (Index = 0;
-      (PpiList[Index].Flags & EFI_PEI_PPI_DESCRIPTOR_TERMINATE_LIST) != EFI_PEI_PPI_DESCRIPTOR_TERMINATE_LIST;
-      Index++) {
+    Index = 0;
+    do {
       if (CompareGuid (PpiList[Index].Guid, &gEfiPeiCoreFvLocationPpiGuid) &&
           (((EFI_PEI_CORE_FV_LOCATION_PPI *) PpiList[Index].Ppi)->PeiCoreFvLocation != 0)
          ) {
@@ -256,12 +255,12 @@ SecStartupPhase2(
           break;
         } else {
           //
-          // PeiCore not found
+          // Invalid PeiCore FV provided by platform
           //
           CpuDeadLoop ();
         }
       }
-    }
+    } while ((PpiList[Index++].Flags & EFI_PEI_PPI_DESCRIPTOR_TERMINATE_LIST) != EFI_PEI_PPI_DESCRIPTOR_TERMINATE_LIST);
   }
   //
   // If EFI_PEI_CORE_FV_LOCATION_PPI not found, try to locate PeiCore from BFV.
-- 
2.13.3.windows.1