Update the ARM MemoryAttributeProtocol to Not Check if Region is System Memory

Description

Project Mu allows the use of the memory attribute protocol to update regions
which are not of GCD type System Memory. Also, this check can cause a lock
issue after the CPU architecture protocol is installed due to the GCD lock
being held during GCD synchronization and a call being made to get memory
attributes using the memory attribute protocol.

- [x] Impacts functionality?
  - **Functionality** - Does the change ultimately impact how firmware functions?
  - Examples: Add a new library, publish a new PPI, update an algorithm, ...
- [ ] Impacts security?
  - **Security** - Does the change have a direct security impact on an application,
    flow, or firmware?
  - Examples: Crypto algorithm change, buffer overflow fix, parameter
    validation improvement, ...
- [ ] Breaking change?
  - **Breaking change** - Will anyone consuming this change experience a break
    in build or boot behavior?
  - Examples: Add a new library class, move a module to a different repo, call
    a function in a new library class in a pre-existing module, ...
- [ ] Includes tests?
  - **Tests** - Does the change include any explicit test code?
  - Examples: Unit tests, integration tests, robot tests, ...
- [ ] Includes documentation?
  - **Documentation** - Does the change contain explicit documentation additions
    outside direct code modifications (and comments)?
  - Examples: Update readme file, add feature readme file, link to documentation
    on an a separate Web page, ...

How This Was Tested

Running QemuSbsaPkg

Integration Instructions

N/A

Author: TaylorBeebe

ArmPkg/Drivers/CpuDxe/MemoryAttribute.c

@@ -8,41 +8,43 @@
 
 #include "CpuDxe.h"
 
-/**
-  Check whether the provided memory range is covered by a single entry of type
-  EfiGcdSystemMemory in the GCD memory map.
-
-  @param  BaseAddress       The physical address that is the start address of
-                            a memory region.
-  @param  Length            The size in bytes of the memory region.
-
-  @return Whether the region is system memory or not.
-**/
-STATIC
-BOOLEAN
-RegionIsSystemMemory (
-  IN  EFI_PHYSICAL_ADDRESS  BaseAddress,
-  IN  UINT64                Length
-  )
-{
-  EFI_GCD_MEMORY_SPACE_DESCRIPTOR  GcdDescriptor;
-  EFI_PHYSICAL_ADDRESS             GcdEndAddress;
-  EFI_STATUS                       Status;
-
-  Status = gDS->GetMemorySpaceDescriptor (BaseAddress, &GcdDescriptor);
-  if (EFI_ERROR (Status) ||
-      (GcdDescriptor.GcdMemoryType != EfiGcdMemoryTypeSystemMemory))
-  {
-    return FALSE;
-  }
-
-  GcdEndAddress = GcdDescriptor.BaseAddress + GcdDescriptor.Length;
-
-  //
-  // Return TRUE if the GCD descriptor covers the range entirely
-  //
-  return GcdEndAddress >= (BaseAddress + Length);
-}
+// MU_CHANGE START: Don't check for GCD system memory when using EFI Attributes Protocol
+// /**
+//   Check whether the provided memory range is covered by a single entry of type
+//   EfiGcdSystemMemory in the GCD memory map.
+
+//   @param  BaseAddress       The physical address that is the start address of
+//                             a memory region.
+//   @param  Length            The size in bytes of the memory region.
+
+//   @return Whether the region is system memory or not.
+// **/
+// STATIC
+// BOOLEAN
+// RegionIsSystemMemory (
+//   IN  EFI_PHYSICAL_ADDRESS  BaseAddress,
+//   IN  UINT64                Length
+//   )
+// {
+//   EFI_GCD_MEMORY_SPACE_DESCRIPTOR  GcdDescriptor;
+//   EFI_PHYSICAL_ADDRESS             GcdEndAddress;
+//   EFI_STATUS                       Status;
+
+//   Status = gDS->GetMemorySpaceDescriptor (BaseAddress, &GcdDescriptor);
+//   if (EFI_ERROR (Status) ||
+//       (GcdDescriptor.GcdMemoryType != EfiGcdMemoryTypeSystemMemory))
+//   {
+//     return FALSE;
+//   }
+
+//   GcdEndAddress = GcdDescriptor.BaseAddress + GcdDescriptor.Length;
+
+//   //
+//   // Return TRUE if the GCD descriptor covers the range entirely
+//   //
+//   return GcdEndAddress >= (BaseAddress + Length);
+// }
+// MU_CHANGE END
 
 /**
   This function retrieves the attributes of the memory region specified by
@@ -85,9 +87,11 @@ GetMemoryAttributes (
     return EFI_INVALID_PARAMETER;
   }
 
-  if (!RegionIsSystemMemory (BaseAddress, Length)) {
-    return EFI_UNSUPPORTED;
-  }
+  // MU_CHANGE START: Don't check for GCD system memory when using EFI Attributes Protocol
+  // if (!RegionIsSystemMemory (BaseAddress, Length)) {
+  //   return EFI_UNSUPPORTED;
+  // }
+  // MU_CHANGE END
 
   DEBUG ((
     DEBUG_VERBOSE,
@@ -198,9 +202,11 @@ SetMemoryAttributes (
     return EFI_INVALID_PARAMETER;
   }
 
-  if (!RegionIsSystemMemory (BaseAddress, Length)) {
-    return EFI_UNSUPPORTED;
-  }
+  // MU_CHANGE START: Don't check for GCD system memory when using EFI Attributes Protocol
+  // if (!RegionIsSystemMemory (BaseAddress, Length)) {
+  //   return EFI_UNSUPPORTED;
+  // }
+  // MU_CHANGE END
 
   return ArmSetMemoryAttributes (BaseAddress, Length, Attributes, Attributes);
 }
@@ -259,9 +265,11 @@ ClearMemoryAttributes (
     return EFI_INVALID_PARAMETER;
   }
 
-  if (!RegionIsSystemMemory (BaseAddress, Length)) {
-    return EFI_UNSUPPORTED;
-  }
+  // MU_CHANGE START: Don't check for GCD system memory when using EFI Attributes Protocol
+  // if (!RegionIsSystemMemory (BaseAddress, Length)) {
+  //   return EFI_UNSUPPORTED;
+  // }
+  // MU_CHANGE END
 
   return ArmSetMemoryAttributes (BaseAddress, Length, 0, Attributes);
 }