BIT0: This is to control if a platform wants to enable VTd
based protection during boot.
BIT1: This is to control if a platform wants to keep VTd
enabled at ExitBootService.

The default configuration is BIT0:1, BIT1:0.

Cc: Star Zeng <star.zeng@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Jiewen Yao <jiewen.yao@intel.com>
---
 IntelSiliconPkg/IntelSiliconPkg.dec | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/IntelSiliconPkg/IntelSiliconPkg.dec b/IntelSiliconPkg/IntelSiliconPkg.dec
index 663a232..2fc6379 100644
--- a/IntelSiliconPkg/IntelSiliconPkg.dec
+++ b/IntelSiliconPkg/IntelSiliconPkg.dec
@@ -44,3 +44,9 @@
   # { 0x56752da9, 0xde6b, 0x4895, 0x88, 0x19, 0x19, 0x45, 0xb6, 0xb7, 0x6c, 0x22 }
   gIntelSiliconPkgTokenSpaceGuid.PcdIntelGraphicsVbtFileGuid|{ 0xa9, 0x2d, 0x75, 0x56, 0x6b, 0xde, 0x95, 0x48, 0x88, 0x19, 0x19, 0x45, 0xb6, 0xb7, 0x6c, 0x22 }|VOID*|0x00000001
 
+  ## The mask is used to control VTd behavior.<BR><BR>
+  #  BIT0: Enable IOMMU during boot.
+  #  BIT1: Enable IOMMU on exit boot service.
+  # @Prompt The policy for VTd driver behavior.
+  gIntelSiliconPkgTokenSpaceGuid.PcdVTdPolicyPropertyMask|1|UINT8|0x00000002
+
-- 
2.7.4.windows.1

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