[edk2-devel] [Patch] StandaloneMmPkg: Fixed communicating from TF-A failed issue

[Ming Huang]

TF-A: TrustedFirmware-a
SPM: Secure Partition Manager(MM)

For AArch64, when SPM enable in TF-A, TF-A may communicate to MM
with buffer address (PLAT_SPM_BUF_BASE). The address is different
from PcdMmBufferBase which use in edk2.
Checking address will let TF-A communicate failed to MM. So remove
below checking code:
if (NsCommBufferAddr < mNsCommBuffer.PhysicalStart) {
  return EFI_ACCESS_DENIED;
}

Signed-off-by: Ming Huang <huangming at linux.alibaba.com>
---
 StandaloneMmPkg/Drivers/StandaloneMmCpu/AArch64/EventHandle.c | 4 ----
 1 file changed, 4 deletions(-)

diff --git a/StandaloneMmPkg/Drivers/StandaloneMmCpu/AArch64/EventHandle.c b/StandaloneMmPkg/Drivers/StandaloneMmCpu/AArch64/EventHandle.c
index 63fbe26642..fe98d3181d 100644
--- a/StandaloneMmPkg/Drivers/StandaloneMmCpu/AArch64/EventHandle.c
+++ b/StandaloneMmPkg/Drivers/StandaloneMmCpu/AArch64/EventHandle.c
@@ -103,10 +103,6 @@ PiMmStandaloneArmTfCpuDriverEntry (
     return EFI_INVALID_PARAMETER;
   }
 
-  if (NsCommBufferAddr < mNsCommBuffer.PhysicalStart) {
-    return EFI_ACCESS_DENIED;
-  }
-
   if ((NsCommBufferAddr + sizeof (EFI_MM_COMMUNICATE_HEADER)) >=
       (mNsCommBuffer.PhysicalStart + mNsCommBuffer.PhysicalSize)) {
     return EFI_INVALID_PARAMETER;
-- 
2.17.1



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