Otherwise, LegacyBoot may be triggered wrongly by other code in UEFI OS,
or vice versa.

Cc: Jiewen Yao <jiewen.yao@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Star Zeng <star.zeng@intel.com>
---
 MdeModulePkg/Core/PiSmmCore/PiSmmCore.c | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/MdeModulePkg/Core/PiSmmCore/PiSmmCore.c b/MdeModulePkg/Core/PiSmmCore/PiSmmCore.c
index 6d266933868d..d516e9dcea34 100644
--- a/MdeModulePkg/Core/PiSmmCore/PiSmmCore.c
+++ b/MdeModulePkg/Core/PiSmmCore/PiSmmCore.c
@@ -157,6 +157,7 @@ SmmLegacyBootHandler (
 {
   EFI_STATUS    Status;
   EFI_HANDLE    SmmHandle;
+  UINTN         Index;
 
   //
   // Install SMM Legacy Boot protocol.
@@ -173,6 +174,16 @@ SmmLegacyBootHandler (
 
   SmiHandlerUnRegister (DispatchHandle);
 
+  //
+  // It is legacy boot, unregister ExitBootService SMI handler.
+  //
+  for (Index = 0; mSmmCoreSmiHandlers[Index].HandlerType != NULL; Index++) {
+    if (CompareGuid (mSmmCoreSmiHandlers[Index].HandlerType, &gEfiEventExitBootServicesGuid)) {
+      SmiHandlerUnRegister (mSmmCoreSmiHandlers[Index].DispatchHandle);
+      break;
+    }
+  }
+
   return Status;
 }
 
@@ -201,6 +212,7 @@ SmmExitBootServicesHandler (
 {
   EFI_STATUS    Status;
   EFI_HANDLE    SmmHandle;
+  UINTN         Index;
 
   //
   // Install SMM Exit Boot Services protocol.
@@ -215,6 +227,16 @@ SmmExitBootServicesHandler (
 
   SmiHandlerUnRegister (DispatchHandle);
 
+  //
+  // It is UEFI boot, unregister LegacyBoot SMI handler.
+  //
+  for (Index = 0; mSmmCoreSmiHandlers[Index].HandlerType != NULL; Index++) {
+    if (CompareGuid (mSmmCoreSmiHandlers[Index].HandlerType, &gEfiEventLegacyBootGuid)) {
+      SmiHandlerUnRegister (mSmmCoreSmiHandlers[Index].DispatchHandle);
+      break;
+    }
+  }
+
   return Status;
 }
 
-- 
2.7.0.windows.1

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Reviewed-by: jiewen.yao@intel.com

> -----Original Message-----
> From: Zeng, Star
> Sent: Monday, December 11, 2017 4:36 PM
> To: edk2-devel@lists.01.org
> Cc: Zeng, Star <star.zeng@intel.com>; Yao, Jiewen <jiewen.yao@intel.com>
> Subject: [PATCH] MdeModulePkg PiSmmCore: Unregister each other for
> LegacyBoot and EBS
> 
> Otherwise, LegacyBoot may be triggered wrongly by other code in UEFI OS,
> or vice versa.
> 
> Cc: Jiewen Yao <jiewen.yao@intel.com>
> Contributed-under: TianoCore Contribution Agreement 1.1
> Signed-off-by: Star Zeng <star.zeng@intel.com>
> ---
>  MdeModulePkg/Core/PiSmmCore/PiSmmCore.c | 22
> ++++++++++++++++++++++
>  1 file changed, 22 insertions(+)
> 
> diff --git a/MdeModulePkg/Core/PiSmmCore/PiSmmCore.c
> b/MdeModulePkg/Core/PiSmmCore/PiSmmCore.c
> index 6d266933868d..d516e9dcea34 100644
> --- a/MdeModulePkg/Core/PiSmmCore/PiSmmCore.c
> +++ b/MdeModulePkg/Core/PiSmmCore/PiSmmCore.c
> @@ -157,6 +157,7 @@ SmmLegacyBootHandler (
>  {
>    EFI_STATUS    Status;
>    EFI_HANDLE    SmmHandle;
> +  UINTN         Index;
> 
>    //
>    // Install SMM Legacy Boot protocol.
> @@ -173,6 +174,16 @@ SmmLegacyBootHandler (
> 
>    SmiHandlerUnRegister (DispatchHandle);
> 
> +  //
> +  // It is legacy boot, unregister ExitBootService SMI handler.
> +  //
> +  for (Index = 0; mSmmCoreSmiHandlers[Index].HandlerType != NULL; Index++)
> {
> +    if (CompareGuid (mSmmCoreSmiHandlers[Index].HandlerType,
> &gEfiEventExitBootServicesGuid)) {
> +      SmiHandlerUnRegister
> (mSmmCoreSmiHandlers[Index].DispatchHandle);
> +      break;
> +    }
> +  }
> +
>    return Status;
>  }
> 
> @@ -201,6 +212,7 @@ SmmExitBootServicesHandler (
>  {
>    EFI_STATUS    Status;
>    EFI_HANDLE    SmmHandle;
> +  UINTN         Index;
> 
>    //
>    // Install SMM Exit Boot Services protocol.
> @@ -215,6 +227,16 @@ SmmExitBootServicesHandler (
> 
>    SmiHandlerUnRegister (DispatchHandle);
> 
> +  //
> +  // It is UEFI boot, unregister LegacyBoot SMI handler.
> +  //
> +  for (Index = 0; mSmmCoreSmiHandlers[Index].HandlerType != NULL; Index++)
> {
> +    if (CompareGuid (mSmmCoreSmiHandlers[Index].HandlerType,
> &gEfiEventLegacyBootGuid)) {
> +      SmiHandlerUnRegister
> (mSmmCoreSmiHandlers[Index].DispatchHandle);
> +      break;
> +    }
> +  }
> +
>    return Status;
>  }
> 
> --
> 2.7.0.windows.1

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