From 3b3d016b7b867d7e4782af9a6b54e110d155a1b3 Mon Sep 17 00:00:00 2001
From: Brijesh Singh <brijesh.singh@amd.com>
Date: Fri, 6 Jul 2018 10:00:41 -0500
Subject: [PATCH] OvmfPkg/QemuFlashFvbServicesRuntimeDxe: Do not expose
 MMIO in SMM build

In the SMM build, only an SMM driver is using the address range hence we
do not need to expose the flash MMIO range in EFI runtime mapping.

Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Anthony Perard <anthony.perard@citrix.com>
Cc: Julien Grall <julien.grall@linaro.org>
Cc: Justen Jordan L <jordan.l.justen@intel.com>
Cc: Laszlo Ersek <lersek@redhat.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Brijesh Singh <brijesh.singh@amd.com>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>
Regression-tested-by: Laszlo Ersek <lersek@redhat.com>
---
 .../FwBlockService.h                          |  7 +++
 .../FwBlockService.c                          | 50 -------------------
 .../FwBlockServiceDxe.c                       | 50 +++++++++++++++++++
 .../FwBlockServiceSmm.c                       | 13 +++++
 4 files changed, 70 insertions(+), 50 deletions(-)

diff --git a/OvmfPkg/QemuFlashFvbServicesRuntimeDxe/FwBlockService.h b/OvmfPkg/QemuFlashFvbServicesRuntimeDxe/FwBlockService.h
index 1f9287b087..178f578d49 100644
--- a/OvmfPkg/QemuFlashFvbServicesRuntimeDxe/FwBlockService.h
+++ b/OvmfPkg/QemuFlashFvbServicesRuntimeDxe/FwBlockService.h
@@ -189,4 +189,11 @@ VOID
 InstallVirtualAddressChangeHandler (
   VOID
   );
+
+EFI_STATUS
+MarkIoMemoryRangeForRuntimeAccess (
+  IN EFI_PHYSICAL_ADDRESS   BaseAddress,
+  IN UINTN                  Length
+  );
+
 #endif
diff --git a/OvmfPkg/QemuFlashFvbServicesRuntimeDxe/FwBlockService.c b/OvmfPkg/QemuFlashFvbServicesRuntimeDxe/FwBlockService.c
index b3f428bb42..eec8b1b1ae 100644
--- a/OvmfPkg/QemuFlashFvbServicesRuntimeDxe/FwBlockService.c
+++ b/OvmfPkg/QemuFlashFvbServicesRuntimeDxe/FwBlockService.c
@@ -829,56 +829,6 @@ ValidateFvHeader (
   return EFI_SUCCESS;
 }
 
-STATIC
-EFI_STATUS
-MarkIoMemoryRangeForRuntimeAccess (
-  EFI_PHYSICAL_ADDRESS                BaseAddress,
-  UINTN                               Length
-  )
-{
-  EFI_STATUS                          Status;
-  EFI_GCD_MEMORY_SPACE_DESCRIPTOR     GcdDescriptor;
-
-  //
-  // Mark flash region as runtime memory
-  //
-  Status = gDS->RemoveMemorySpace (
-                  BaseAddress,
-                  Length
-                  );
-
-  Status = gDS->AddMemorySpace (
-                  EfiGcdMemoryTypeMemoryMappedIo,
-                  BaseAddress,
-                  Length,
-                  EFI_MEMORY_UC | EFI_MEMORY_RUNTIME
-                  );
-  ASSERT_EFI_ERROR (Status);
-
-  Status = gDS->AllocateMemorySpace (
-                  EfiGcdAllocateAddress,
-                  EfiGcdMemoryTypeMemoryMappedIo,
-                  0,
-                  Length,
-                  &BaseAddress,
-                  gImageHandle,
-                  NULL
-                  );
-  ASSERT_EFI_ERROR (Status);
-
-  Status = gDS->GetMemorySpaceDescriptor (BaseAddress, &GcdDescriptor);
-  ASSERT_EFI_ERROR (Status);
-
-  Status = gDS->SetMemorySpaceAttributes (
-                  BaseAddress,
-                  Length,
-                  GcdDescriptor.Attributes | EFI_MEMORY_RUNTIME
-                  );
-  ASSERT_EFI_ERROR (Status);
-
-  return Status;
-}
-
 STATIC
 EFI_STATUS
 InitializeVariableFvHeader (
diff --git a/OvmfPkg/QemuFlashFvbServicesRuntimeDxe/FwBlockServiceDxe.c b/OvmfPkg/QemuFlashFvbServicesRuntimeDxe/FwBlockServiceDxe.c
index 63b308658e..37deece363 100644
--- a/OvmfPkg/QemuFlashFvbServicesRuntimeDxe/FwBlockServiceDxe.c
+++ b/OvmfPkg/QemuFlashFvbServicesRuntimeDxe/FwBlockServiceDxe.c
@@ -17,6 +17,7 @@
 #include <Guid/EventGroup.h>
 #include <Library/DebugLib.h>
 #include <Library/DevicePathLib.h>
+#include <Library/DxeServicesTableLib.h>
 #include <Library/PcdLib.h>
 #include <Library/UefiBootServicesTableLib.h>
 #include <Library/UefiRuntimeLib.h>
@@ -155,3 +156,52 @@ InstallVirtualAddressChangeHandler (
                   );
   ASSERT_EFI_ERROR (Status);
 }
+
+EFI_STATUS
+MarkIoMemoryRangeForRuntimeAccess (
+  IN EFI_PHYSICAL_ADDRESS                BaseAddress,
+  IN UINTN                               Length
+  )
+{
+  EFI_STATUS                          Status;
+  EFI_GCD_MEMORY_SPACE_DESCRIPTOR     GcdDescriptor;
+
+  //
+  // Mark flash region as runtime memory
+  //
+  Status = gDS->RemoveMemorySpace (
+                  BaseAddress,
+                  Length
+                  );
+
+  Status = gDS->AddMemorySpace (
+                  EfiGcdMemoryTypeMemoryMappedIo,
+                  BaseAddress,
+                  Length,
+                  EFI_MEMORY_UC | EFI_MEMORY_RUNTIME
+                  );
+  ASSERT_EFI_ERROR (Status);
+
+  Status = gDS->AllocateMemorySpace (
+                  EfiGcdAllocateAddress,
+                  EfiGcdMemoryTypeMemoryMappedIo,
+                  0,
+                  Length,
+                  &BaseAddress,
+                  gImageHandle,
+                  NULL
+                  );
+  ASSERT_EFI_ERROR (Status);
+
+  Status = gDS->GetMemorySpaceDescriptor (BaseAddress, &GcdDescriptor);
+  ASSERT_EFI_ERROR (Status);
+
+  Status = gDS->SetMemorySpaceAttributes (
+                  BaseAddress,
+                  Length,
+                  GcdDescriptor.Attributes | EFI_MEMORY_RUNTIME
+                  );
+  ASSERT_EFI_ERROR (Status);
+
+  return Status;
+}
diff --git a/OvmfPkg/QemuFlashFvbServicesRuntimeDxe/FwBlockServiceSmm.c b/OvmfPkg/QemuFlashFvbServicesRuntimeDxe/FwBlockServiceSmm.c
index e0617f2503..af08fa69d4 100644
--- a/OvmfPkg/QemuFlashFvbServicesRuntimeDxe/FwBlockServiceSmm.c
+++ b/OvmfPkg/QemuFlashFvbServicesRuntimeDxe/FwBlockServiceSmm.c
@@ -67,3 +67,16 @@ InstallVirtualAddressChangeHandler (
   // Nothing.
   //
 }
+
+EFI_STATUS
+MarkIoMemoryRangeForRuntimeAccess (
+  IN EFI_PHYSICAL_ADDRESS                BaseAddress,
+  IN UINTN                               Length
+  )
+{
+  //
+  // Nothing
+  //
+
+  return EFI_SUCCESS;
+}
-- 
2.17.1