Re: [PATCH] IntelSiliconPkg-Vtd: Set all IOMMU PMR to same range

["Ni, Ray" <ray.ni@intel.com>]

Evelyn,
Can you include more info in the commit message? such was reason and result of this change.

> -----Original Message-----
> From: Wang, Iwen Evelyn <iwen.evelyn.wang@intel.com>
> Sent: Tuesday, June 2, 2020 7:49 AM
> To: devel@edk2.groups.io
> Cc: Huang, Jenny <jenny.huang@intel.com>; Shih, More <more.shih@intel.com>; Ni, Ray <ray.ni@intel.com>; Chaganty,
> Rangasai V <rangasai.v.chaganty@intel.com>; Yao, Jiewen <jiewen.yao@intel.com>; Sheng, W <w.sheng@intel.com>
> Subject: [PATCH] IntelSiliconPkg-Vtd: Set all IOMMU PMR to same range
> 
> REF: https://bugzilla.tianocore.org/show_bug.cgi?id=2775
> 
> Signed-off-by: Evelyn Wang <iwen.evelyn.wang@intel.com>
> Cc: Jenny Huang <jenny.huang@intel.com>
> Cc: More Shih <more.shih@intel.com>
> Cc: Ray Ni <ray.ni@intel.com>
> Cc: Rangasai V Chaganty <rangasai.v.chaganty@intel.com>
> Cc: Jiewen Yao <jiewen.yao@intel.com>
> Cc: W Sheng <w.sheng@intel.com>
> ---
>  .../Feature/VTd/IntelVTdPmrPei/DmarTable.c         | 38 +++++++++++++++-------
>  1 file changed, 26 insertions(+), 12 deletions(-)
> 
> diff --git a/Silicon/Intel/IntelSiliconPkg/Feature/VTd/IntelVTdPmrPei/DmarTable.c
> b/Silicon/Intel/IntelSiliconPkg/Feature/VTd/IntelVTdPmrPei/DmarTable.c
> index d920d136f1..fd64051032 100644
> --- a/Silicon/Intel/IntelSiliconPkg/Feature/VTd/IntelVTdPmrPei/DmarTable.c
> +++ b/Silicon/Intel/IntelSiliconPkg/Feature/VTd/IntelVTdPmrPei/DmarTable.c
> @@ -1,6 +1,6 @@
>  /** @file
> 
> -  Copyright (c) 2017 - 2018, Intel Corporation. All rights reserved.<BR>
> +  Copyright (c) 2017 - 2020, Intel Corporation. All rights reserved.<BR>
>    SPDX-License-Identifier: BSD-2-Clause-Patent
> 
>  **/
> @@ -13,7 +13,7 @@
>  #include <Library/HobLib.h>
>  #include <IndustryStandard/Vtd.h>
>  #include <Ppi/VtdInfo.h>
> -
> +#include <Guid/VtdPmrInfoHob.h>
>  #include "IntelVTdPmrPei.h"
> 
>  /**
> @@ -502,19 +502,17 @@ ProcessRmrr (
>    UINT64                                            RmrrMask;
>    UINTN                                             LowBottom;
>    UINTN                                             LowTop;
> -  UINTN                                             HighBottom;
> +  UINT64                                            HighBottom;
>    UINT64                                            HighTop;
>    EFI_ACPI_DMAR_HEADER                              *AcpiDmarTable;
> +  VTD_PMR_INFO_HOB                                  *VtdPmrHob;
> +  VOID                                              *VtdPmrHobPtr;
> 
> +  VtdPmrHobPtr = GetFirstGuidHob (&gVtdPmrInfoDataHobGuid);
>    AcpiDmarTable = VTdInfo->AcpiDmarTable;
> 
>    DEBUG ((DEBUG_INFO,"  RMRR (Base 0x%016lx, Limit 0x%016lx)\n", DmarRmrr->ReservedMemoryRegionBaseAddress,
> DmarRmrr->ReservedMemoryRegionLimitAddress));
> 
> -  if ((DmarRmrr->ReservedMemoryRegionBaseAddress == 0) ||
> -      (DmarRmrr->ReservedMemoryRegionLimitAddress == 0)) {
> -    return ;
> -  }
> -
>    DmarDevScopeEntry = (EFI_ACPI_DMAR_DEVICE_SCOPE_STRUCTURE_HEADER *)((UINTN)(DmarRmrr + 1));
>    while ((UINTN)DmarDevScopeEntry < (UINTN)DmarRmrr + DmarRmrr->Header.Length) {
>      ASSERT (DmarDevScopeEntry->Type == EFI_ACPI_DEVICE_SCOPE_ENTRY_TYPE_PCI_ENDPOINT);
> @@ -523,10 +521,26 @@ ProcessRmrr (
>      if (VTdIndex != (UINTN)-1) {
>        RmrrMask = LShiftU64 (1, VTdIndex);
> 
> -      LowBottom = 0;
> -      LowTop = (UINTN)DmarRmrr->ReservedMemoryRegionBaseAddress;
> -      HighBottom = (UINTN)DmarRmrr->ReservedMemoryRegionLimitAddress + 1;
> -      HighTop = LShiftU64 (1, VTdInfo->HostAddressWidth + 1);
> +      if (VtdPmrHobPtr == NULL) {
> +        LowBottom = 0;
> +        LowTop = (UINTN)DmarRmrr->ReservedMemoryRegionBaseAddress;
> +        HighBottom = DmarRmrr->ReservedMemoryRegionLimitAddress + 1;
> +        HighTop = LShiftU64 (1, VTdInfo->HostAddressWidth + 1);
> +      } else {
> +        /**
> +        When gVtdPmrInfoDataHobGuid exists, it means:
> +        1. Dma buffer is reserved by memory initialize code
> +        2. PeiGetVtdPmrAlignmentLib is used to get alignment
> +        3. PMR ranges are determined by the system memory map
> +        4. PMR ranges will be conveyed through VTD_PMR_INFO_HOB
> +        5. All IOMMU PMR should have the same ranges
> +        **/
> +        VtdPmrHob = GET_GUID_HOB_DATA (VtdPmrHobPtr);
> +        LowBottom = VtdPmrHob->ProtectedLowBase;
> +        LowTop = VtdPmrHob->ProtectedLowLimit;
> +        HighBottom = VtdPmrHob->ProtectedHighBase;
> +        HighTop = VtdPmrHob->ProtectedHighLimit;
> +      }
> 
>        SetDmaProtectedRange (
>          VTdInfo,
> --
> 2.16.2.windows.1