Reviewed-by: Ray Ni <ray...@intel.com>
> -----Original Message-----
> From: Tan, Dun <dun....@intel.com>
> Sent: Tuesday, May 16, 2023 6:00 PM
> To: devel@edk2.groups.io
> Cc: Dong, Eric <eric.d...@intel.com>; Ni, Ray <ray...@intel.com>; Kumar, Rahul
> R <rahul.r.ku...@intel.com>; Gerd Hoffmann <kra...@redhat.com>
> Subject: [Patch V4 15/15] UefiCpuPkg/PiSmmCpuDxeSmm: Remove unnecessary
> function
>
> Remove unnecessary function SetNotPresentPage(). We can directly
> use ConvertMemoryPageAttributes to set a range to non-present.
>
> Signed-off-by: Dun Tan <dun....@intel.com>
> Cc: Eric Dong <eric.d...@intel.com>
> Cc: Ray Ni <ray...@intel.com>
> Cc: Rahul Kumar <rahul1.ku...@intel.com>
> Cc: Gerd Hoffmann <kra...@redhat.com>
> ---
> UefiCpuPkg/PiSmmCpuDxeSmm/PiSmmCpuDxeSmm.c | 8 ++++++--
> UefiCpuPkg/PiSmmCpuDxeSmm/PiSmmCpuDxeSmm.h | 16 ----------------
> UefiCpuPkg/PiSmmCpuDxeSmm/SmmCpuMemoryManagement.c | 22 ------------
> ----------
> 3 files changed, 6 insertions(+), 40 deletions(-)
>
> diff --git a/UefiCpuPkg/PiSmmCpuDxeSmm/PiSmmCpuDxeSmm.c
> b/UefiCpuPkg/PiSmmCpuDxeSmm/PiSmmCpuDxeSmm.c
> index d69e976269..7fa1867b63 100644
> --- a/UefiCpuPkg/PiSmmCpuDxeSmm/PiSmmCpuDxeSmm.c
> +++ b/UefiCpuPkg/PiSmmCpuDxeSmm/PiSmmCpuDxeSmm.c
> @@ -1074,10 +1074,14 @@ PiCpuSmmEntry (
> mSmmShadowStackSize
> );
> if (FeaturePcdGet (PcdCpuSmmStackGuard)) {
> - SetNotPresentPage (
> + ConvertMemoryPageAttributes (
> Cr3,
> + mPagingMode,
> (EFI_PHYSICAL_ADDRESS)(UINTN)Stacks + mSmmStackSize +
> EFI_PAGES_TO_SIZE (1) + (mSmmStackSize + mSmmShadowStackSize) * Index,
> - EFI_PAGES_TO_SIZE (1)
> + EFI_PAGES_TO_SIZE (1),
> + EFI_MEMORY_RP,
> + TRUE,
> + NULL
> );
> }
> }
> diff --git a/UefiCpuPkg/PiSmmCpuDxeSmm/PiSmmCpuDxeSmm.h
> b/UefiCpuPkg/PiSmmCpuDxeSmm/PiSmmCpuDxeSmm.h
> index 12ad86028e..0dc4d758cc 100644
> --- a/UefiCpuPkg/PiSmmCpuDxeSmm/PiSmmCpuDxeSmm.h
> +++ b/UefiCpuPkg/PiSmmCpuDxeSmm/PiSmmCpuDxeSmm.h
> @@ -1247,22 +1247,6 @@ SetShadowStack (
> IN UINT64 Length
> );
>
> -/**
> - Set not present memory.
> -
> - @param[in] Cr3 The page table base address.
> - @param[in] BaseAddress The physical address that is the start
> address of a
> memory region.
> - @param[in] Length The size in bytes of the memory region.
> -
> - @retval EFI_SUCCESS The not present memory is set.
> -**/
> -EFI_STATUS
> -SetNotPresentPage (
> - IN UINTN Cr3,
> - IN EFI_PHYSICAL_ADDRESS BaseAddress,
> - IN UINT64 Length
> - );
> -
> /**
> Initialize the shadow stack related data structure.
>
> diff --git a/UefiCpuPkg/PiSmmCpuDxeSmm/SmmCpuMemoryManagement.c
> b/UefiCpuPkg/PiSmmCpuDxeSmm/SmmCpuMemoryManagement.c
> index 138ff43c9d..95de472ebf 100644
> --- a/UefiCpuPkg/PiSmmCpuDxeSmm/SmmCpuMemoryManagement.c
> +++ b/UefiCpuPkg/PiSmmCpuDxeSmm/SmmCpuMemoryManagement.c
> @@ -752,28 +752,6 @@ SetShadowStack (
> return Status;
> }
>
> -/**
> - Set not present memory.
> -
> - @param[in] Cr3 The page table base address.
> - @param[in] BaseAddress The physical address that is the start
> address of a
> memory region.
> - @param[in] Length The size in bytes of the memory region.
> -
> - @retval EFI_SUCCESS The not present memory is set.
> -**/
> -EFI_STATUS
> -SetNotPresentPage (
> - IN UINTN Cr3,
> - IN EFI_PHYSICAL_ADDRESS BaseAddress,
> - IN UINT64 Length
> - )
> -{
> - EFI_STATUS Status;
> -
> - Status = SmmSetMemoryAttributesEx (Cr3, mPagingMode, BaseAddress,
> Length, EFI_MEMORY_RP);
> - return Status;
> -}
> -
> /**
> Retrieves a pointer to the system configuration table from the SMM System
> Table
> based on a specified GUID.
> --
> 2.31.1.windows.1
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