Define CPU_HOT_EJECT_DATA and add PCD PcdCpuHotEjectDataAddress, which
will be used to share CPU ejection state between OvmfPkg/CpuHotPlugSmm
and PiSmmCpuDxeSmm.

Cc: Laszlo Ersek <lersek@redhat.com>
Cc: Jordan Justen <jordan.l.justen@intel.com>
Cc: Ard Biesheuvel <ard.biesheuvel@arm.com>
Cc: Igor Mammedov <imammedo@redhat.com>
Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Cc: Aaron Young <aaron.young@oracle.com>
Ref: https://bugzilla.tianocore.org/show_bug.cgi?id=3132
Signed-off-by: Ankur Arora <ankur.a.arora@oracle.com>
---
 OvmfPkg/CpuHotplugSmm/CpuHotplugSmm.inf   |  1 +
 OvmfPkg/Include/Library/CpuHotEjectData.h | 31 +++++++++++++++++++++++++++++++
 OvmfPkg/OvmfPkg.dec                       |  6 ++++++
 3 files changed, 38 insertions(+)
 create mode 100644 OvmfPkg/Include/Library/CpuHotEjectData.h

diff --git a/OvmfPkg/CpuHotplugSmm/CpuHotplugSmm.inf b/OvmfPkg/CpuHotplugSmm/CpuHotplugSmm.inf
index 04322b0d7855..e08b572ef169 100644
--- a/OvmfPkg/CpuHotplugSmm/CpuHotplugSmm.inf
+++ b/OvmfPkg/CpuHotplugSmm/CpuHotplugSmm.inf
@@ -54,6 +54,7 @@
 
 [Pcd]
   gUefiCpuPkgTokenSpaceGuid.PcdCpuHotPlugDataAddress                ## CONSUMES
+  gUefiOvmfPkgTokenSpaceGuid.PcdCpuHotEjectDataAddress              ## CONSUMES
   gUefiOvmfPkgTokenSpaceGuid.PcdQ35SmramAtDefaultSmbase             ## CONSUMES
 
 [FeaturePcd]
diff --git a/OvmfPkg/Include/Library/CpuHotEjectData.h b/OvmfPkg/Include/Library/CpuHotEjectData.h
new file mode 100644
index 000000000000..9716bbcafcec
--- /dev/null
+++ b/OvmfPkg/Include/Library/CpuHotEjectData.h
@@ -0,0 +1,31 @@
+/** @file
+ * Definition for a structure sharing information for CPU hot plug.
+ *
+ * Copyright (c) 2021, Oracle Corporation.
+ * SPDX-License-Identifier: BSD-2-Clause-Patent
+ **/
+
+#ifndef _CPU_HOT_EJECT_DATA_H
+#define _CPU_HOT_EJECT_DATA_H
+
+typedef
+VOID
+(EFIAPI *CPU_HOT_EJECT_FN)(
+  IN UINTN  ProcessorNum
+  );
+
+#define CPU_EJECT_INVALID               (MAX_UINT64)
+#define CPU_EJECT_WORKER                (MAX_UINT64-1)
+
+#define  CPU_HOT_EJECT_DATA_REVISION_1	0x00000001
+
+typedef struct {
+  UINT32           Revision;          // Used for version identification for this structure
+  UINT32           ArrayLength;       // Number of entries for the ApicIdMap array
+
+  UINT64           *ApicIdMap;        // Pointer to CpuIndex->ApicId map for pending ejects
+  CPU_HOT_EJECT_FN Handler;           // Handler to do the CPU ejection
+  UINT64           Reserved;
+} CPU_HOT_EJECT_DATA;
+
+#endif /* _CPU_HOT_EJECT_DATA_H */
diff --git a/OvmfPkg/OvmfPkg.dec b/OvmfPkg/OvmfPkg.dec
index 54804962ec02..e0f247181fe2 100644
--- a/OvmfPkg/OvmfPkg.dec
+++ b/OvmfPkg/OvmfPkg.dec
@@ -347,6 +347,12 @@
   #
   #  This PCD is only accessed if PcdSmmSmramRequire is TRUE (see below).
   gUefiOvmfPkgTokenSpaceGuid.PcdQ35SmramAtDefaultSmbase|FALSE|BOOLEAN|0x34
+
+  ## This PCD adds a communication channel between PiSmmCpuDxe and
+  #  CpuHotplugSmm.
+  #
+  #  Only accessed if PcdCpuHotPlugSupport is TRUE
+  gUefiOvmfPkgTokenSpaceGuid.PcdCpuHotEjectDataAddress|0|UINT64|0x46
 
 [PcdsFeatureFlag]
   gUefiOvmfPkgTokenSpaceGuid.PcdQemuBootOrderPciTranslation|TRUE|BOOLEAN|0x1c
-- 
2.9.3



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