Re: [PATCH v3 1/3] IntelSiliconPkg/VtdInfo: Add Null Root Entry Table PPI

["Chaganty, Rangasai V" <rangasai.v.chaganty@intel.com>]

Reviewed-by: Sai Chaganty <rangasai.v.chaganty@intel.com>

-----Original Message-----
From: Sheng, W <w.sheng@intel.com> 
Sent: Sunday, August 30, 2020 11:38 PM
To: devel@edk2.groups.io
Cc: Ni, Ray <ray.ni@intel.com>; Chaganty, Rangasai V <rangasai.v.chaganty@intel.com>
Subject: [PATCH v3 1/3] IntelSiliconPkg/VtdInfo: Add Null Root Entry Table PPI

Null root entry table address is a fixed silicon reserved address, which is used to block the DMA transfer.

REF: https://bugzilla.tianocore.org/show_bug.cgi?id=2867

Change-Id: I3aa2b2e7a11e0327857c6ed9bc92cd209d3ade9d
Cc: Ray Ni <ray.ni@intel.com>
Cc: Rangasai V Chaganty <rangasai.v.chaganty@intel.com>
Signed-off-by: Sheng Wei <w.sheng@intel.com>
---
 .../Include/Ppi/VtdNullRootEntryTable.h            | 28 ++++++++++++++++++++++
 Silicon/Intel/IntelSiliconPkg/IntelSiliconPkg.dec  |  1 +
 2 files changed, 29 insertions(+)
 create mode 100644 Silicon/Intel/IntelSiliconPkg/Include/Ppi/VtdNullRootEntryTable.h

diff --git a/Silicon/Intel/IntelSiliconPkg/Include/Ppi/VtdNullRootEntryTable.h b/Silicon/Intel/IntelSiliconPkg/Include/Ppi/VtdNullRootEntryTable.h
new file mode 100644
index 00000000..d79b5fd9
--- /dev/null
+++ b/Silicon/Intel/IntelSiliconPkg/Include/Ppi/VtdNullRootEntryTable.h
@@ -0,0 +1,28 @@
+/** @file
+  The definition for VTD Null Root Entry Table PPI.
+
+  This is a lightweight VTd null root entry table report in PEI phase.
+
+  Copyright (c) 2020, Intel Corporation. All rights reserved.<BR>
+  SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+#ifndef __VTD_NULL_ROOT_ENTRY_TABLE_PPI_H__
+#define __VTD_NULL_ROOT_ENTRY_TABLE_PPI_H__
+
+#define EDKII_VTD_NULL_ROOT_ENTRY_TABLE_PPI_GUID \
+    { \
+      0x3de0593f, 0x6e3e, 0x4542, { 0xa1, 0xcb, 0xcb, 0xb2, 0xdb, 0xeb, 0xd8, 0xff } \
+    }
+
+//
+// Null root entry table address is a fixed silicon reserved address,
+//   which is used to block the DMA transfer.
+//
+typedef UINT64  EDKII_VTD_NULL_ROOT_ENTRY_TABLE_PPI;
+
+extern EFI_GUID gEdkiiVTdNullRootEntryTableGuid;
+
+#endif
+
diff --git a/Silicon/Intel/IntelSiliconPkg/IntelSiliconPkg.dec b/Silicon/Intel/IntelSiliconPkg/IntelSiliconPkg.dec
index e4a7fec3..284820af 100644
--- a/Silicon/Intel/IntelSiliconPkg/IntelSiliconPkg.dec
+++ b/Silicon/Intel/IntelSiliconPkg/IntelSiliconPkg.dec
@@ -68,6 +68,7 @@
 
 [Ppis]
   gEdkiiVTdInfoPpiGuid = { 0x8a59fcb3, 0xf191, 0x400c, { 0x97, 0x67, 0x67, 0xaf, 0x2b, 0x25, 0x68, 0x4a } }
+  gEdkiiVTdNullRootEntryTableGuid = { 0x3de0593f, 0x6e3e, 0x4542, { 
+ 0xa1, 0xcb, 0xcb, 0xb2, 0xdb, 0xeb, 0xd8, 0xff } }
 
 [Protocols]
   gEdkiiPlatformVTdPolicyProtocolGuid = { 0x3d17e448, 0x466, 0x4e20, { 0x99, 0x9f, 0xb2, 0xe1, 0x34, 0x88, 0xee, 0x22 }}
--
2.16.2.windows.1