StandaloneMmPkg: Fix check buffer address failed issue from TF-A

There are two scene communicate with StandaloneMm(MM):
1 edk2 -> TF-A -> MM, communicate MM use non-secure buffer which
  specify by EFI_SECURE_PARTITION_BOOT_INFO.SpNsCommBufBase;
2 RAS scene: fiq -> TF-A -> MM, use secure buffer which
  specify by EFI_SECURE_PARTITION_BOOT_INFO.SpShareBufBase;

For now, the second scene will failed because check buffer address.
This patch add CheckBufferAddr() to support check address for secure
buffer.

Signed-off-by: Ming Huang <huangming@linux.alibaba.com>
Reviewed-by: Sami Mujawar <sami.mujawar@arm.com>

1 files changed, 21 insertions, 0 deletions

diff --git a/StandaloneMmPkg/Drivers/StandaloneMmCpu/StandaloneMmCpu.c b/StandaloneMmPkg/Drivers/StandaloneMmCpu/StandaloneMmCpu.c
index d8bfba2..3d1dc61 100644
--- a/StandaloneMmPkg/Drivers/StandaloneMmCpu/StandaloneMmCpu.c
+++ b/StandaloneMmPkg/Drivers/StandaloneMmCpu/StandaloneMmCpu.c
@@ -106,6 +106,7 @@ StandaloneMmCpuInitialize (
   UINTN                            Index;

   UINTN                            ArraySize;

   VOID                             *HobStart;

+  EFI_MMRAM_HOB_DESCRIPTOR_BLOCK   *MmramRangesHob;

 

   ASSERT (SystemTable != NULL);

   mMmst = SystemTable;

@@ -188,6 +189,26 @@ StandaloneMmCpuInitialize (
   CopyMem (&mNsCommBuffer, NsCommBufMmramRange, sizeof (EFI_MMRAM_DESCRIPTOR));

   DEBUG ((DEBUG_INFO, "mNsCommBuffer: 0x%016lx - 0x%lx\n", mNsCommBuffer.CpuStart, mNsCommBuffer.PhysicalSize));

 

+  Status = GetGuidedHobData (

+             HobStart,

+             &gEfiMmPeiMmramMemoryReserveGuid,

+             (VOID **)&MmramRangesHob

+             );

+  if (EFI_ERROR (Status)) {

+    DEBUG ((DEBUG_ERROR, "MmramRangesHob data extraction failed - 0x%x\n", Status));

+    return Status;

+  }

+

+  //

+  // As CreateHobListFromBootInfo(), the base and size of buffer shared with

+  // privileged Secure world software is in second one.

+  //

+  CopyMem (

+    &mSCommBuffer,

+    &MmramRangesHob->Descriptor[0] + 1,

+    sizeof (EFI_MMRAM_DESCRIPTOR)

+    );

+

   //

   // Extract the MP information from the Hoblist

   //