diff --git a/OvmfPkg/Library/ResetSystemLib/BaseResetShutdownXen.c b/OvmfPkg/Library/ResetSystemLib/BaseResetShutdownXen.c
new file mode 100644
index 0000000000..f45d9125fe
--- /dev/null
+++ b/OvmfPkg/Library/ResetSystemLib/BaseResetShutdownXen.c
@@ -0,0 +1,65 @@
+/** @file
+  Base Reset System Library Shutdown API implementation for OVMF.
+
+  Copyright (C) 2020, Red Hat, Inc.
+  Copyright (c) 2006 - 2019, Intel Corporation. All rights reserved.<BR>
+  Copyright (c) 2022, Citrix Systems, Inc.
+
+  SPDX-License-Identifier: BSD-2-Clause-Patent
+**/
+
+#include <Base.h>                   // BIT13
+
+#include <Library/BaseLib.h>        // CpuDeadLoop()
+#include <Library/DebugLib.h>       // ASSERT()
+#include <Library/IoLib.h>          // IoOr16()
+#include <Library/PciLib.h>         // PciRead16()
+#include <Library/ResetSystemLib.h> // ResetShutdown()
+#include <Library/XenHypercallLib.h>
+#include <OvmfPlatforms.h>          // OVMF_HOSTBRIDGE_DID
+
+/**
+  Calling this function causes the system to enter a power state equivalent
+  to the ACPI G2/S5 or G3 states.
+
+  System shutdown should not return, if it returns, it means the system does
+  not support shut down reset.
+**/
+VOID
+EFIAPI
+ResetShutdown (
+  VOID
+  )
+{
+  UINT16  AcpiPmBaseAddress;
+  UINT16  HostBridgeDevId;
+
+  AcpiPmBaseAddress = 0;
+  HostBridgeDevId   = PciRead16 (OVMF_HOSTBRIDGE_DID);
+  switch (HostBridgeDevId) {
+    case INTEL_82441_DEVICE_ID:
+      AcpiPmBaseAddress = PIIX4_PMBA_VALUE;
+      break;
+    case INTEL_Q35_MCH_DEVICE_ID:
+      AcpiPmBaseAddress = ICH9_PMBASE_VALUE;
+      break;
+    default:
+    {
+      //
+      // Fallback to using hypercall.
+      // Necessary for PVH guest, but should work for HVM guest.
+      //
+      INTN                ReturnCode;
+      XEN_SCHED_SHUTDOWN  ShutdownOp = {
+        .Reason = XEN_SHED_SHUTDOWN_POWEROFF,
+      };
+      ReturnCode = XenHypercallSchedOp (XEN_SCHEDOP_SHUTDOWN, ShutdownOp);
+      ASSERT (ReturnCode == 0);
+      CpuDeadLoop ();
+    }
+  }
+
+  IoBitFieldWrite16 (AcpiPmBaseAddress + 4, 10, 13, 0);
+  IoOr16 (AcpiPmBaseAddress + 4, BIT13);
+  CpuDeadLoop ();
+}
diff --git a/OvmfPkg/Library/ResetSystemLib/BaseResetSystemLibXen.inf b/OvmfPkg/Library/ResetSystemLib/BaseResetSystemLibXen.inf
new file mode 100644
index 0000000000..8d75dd5653
--- /dev/null
+++ b/OvmfPkg/Library/ResetSystemLib/BaseResetSystemLibXen.inf
@@ -0,0 +1,41 @@
+## @file
+#  Base library instance for ResetSystem library class for Xen
+#
+#  Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>
+#  Copyright (c) 2022, Citrix Systems, Inc.
+#
+#  SPDX-License-Identifier: BSD-2-Clause-Patent
+#
+##
+
+[Defines]
+  INF_VERSION                    = 0x00010005
+  BASE_NAME                      = BaseResetSystemLib
+  FILE_GUID                      = 9ef32aa1-9e82-4fb1-9c49-0eff538601f8
+  MODULE_TYPE                    = BASE
+  VERSION_STRING                 = 1.0
+  LIBRARY_CLASS                  = ResetSystemLib|SEC PEI_CORE PEIM DXE_CORE
+
+#
+# The following information is for reference only and not required by the build
+# tools.
+#
+#  VALID_ARCHITECTURES           = IA32 X64
+#
+
+[Sources]
+  BaseResetShutdownXen.c
+  ResetSystemLib.c
+
+[Packages]
+  MdeModulePkg/MdeModulePkg.dec
+  MdePkg/MdePkg.dec
+  OvmfPkg/OvmfPkg.dec
+
+[LibraryClasses]
+  BaseLib
+  DebugLib
+  IoLib
+  PciLib
+  TimerLib
+  XenHypercallLib
diff --git a/OvmfPkg/Library/ResetSystemLib/DxeResetShutdownXen.c b/OvmfPkg/Library/ResetSystemLib/DxeResetShutdownXen.c
new file mode 100644
index 0000000000..f7f32765cf
--- /dev/null
+++ b/OvmfPkg/Library/ResetSystemLib/DxeResetShutdownXen.c
@@ -0,0 +1,77 @@
+/** @file
+  DXE Reset System Library Shutdown API implementation for OVMF.
+
+  Copyright (C) 2020, Red Hat, Inc.
+  Copyright (c) 2006 - 2019, Intel Corporation. All rights reserved.<BR>
+  SPDX-License-Identifier: BSD-2-Clause-Patent
+**/
+
+#include <Base.h>                   // BIT13
+
+#include <IndustryStandard/Xen/sched.h>
+#include <Library/BaseLib.h>        // CpuDeadLoop()
+#include <Library/DebugLib.h>       // ASSERT()
+#include <Library/IoLib.h>          // IoOr16()
+#include <Library/PcdLib.h>         // PcdGet16()
+#include <Library/ResetSystemLib.h> // ResetShutdown()
+#include <Library/XenHypercallLib.h>
+#include <OvmfPlatforms.h>          // PIIX4_PMBA_VALUE
+
+STATIC UINT16  mAcpiPmBaseAddress;
+
+EFI_STATUS
+EFIAPI
+DxeResetInit (
+  IN EFI_HANDLE        ImageHandle,
+  IN EFI_SYSTEM_TABLE  *SystemTable
+  )
+{
+  UINT16  HostBridgeDevId;
+
+  HostBridgeDevId = PcdGet16 (PcdOvmfHostBridgePciDevId);
+  switch (HostBridgeDevId) {
+    case INTEL_82441_DEVICE_ID:
+      mAcpiPmBaseAddress = PIIX4_PMBA_VALUE;
+      break;
+    case INTEL_Q35_MCH_DEVICE_ID:
+      mAcpiPmBaseAddress = ICH9_PMBASE_VALUE;
+      break;
+    default:
+      //
+      // Fallback to using hypercall.
+      // Necessary for PVH guest, but should work for HVM guest.
+      //
+      mAcpiPmBaseAddress = 0xffff;
+      break;
+  }
+
+  return EFI_SUCCESS;
+}
+
+/**
+  Calling this function causes the system to enter a power state equivalent
+  to the ACPI G2/S5 or G3 states.
+
+  System shutdown should not return, if it returns, it means the system does
+  not support shut down reset.
+**/
+VOID
+EFIAPI
+ResetShutdown (
+  VOID
+  )
+{
+  if (mAcpiPmBaseAddress != 0xffff) {
+    IoBitFieldWrite16 (mAcpiPmBaseAddress + 4, 10, 13, 0);
+    IoOr16 (mAcpiPmBaseAddress + 4, BIT13);
+  } else {
+    INTN                ReturnCode;
+    XEN_SCHED_SHUTDOWN  ShutdownOp = {
+      .Reason = XEN_SHED_SHUTDOWN_POWEROFF,
+    };
+    ReturnCode = XenHypercallSchedOp (XEN_SCHEDOP_SHUTDOWN, &ShutdownOp);
+    ASSERT (ReturnCode == 0);
+  }
+
+  CpuDeadLoop ();
+}
diff --git a/OvmfPkg/Library/ResetSystemLib/DxeResetSystemLibXen.inf b/OvmfPkg/Library/ResetSystemLib/DxeResetSystemLibXen.inf
new file mode 100644
index 0000000000..ccee69e6e1
--- /dev/null
+++ b/OvmfPkg/Library/ResetSystemLib/DxeResetSystemLibXen.inf
@@ -0,0 +1,46 @@
+## @file
+#  DXE library instance for ResetSystem library class for Xen
+#
+#  Copyright (C) 2020, Red Hat, Inc.
+#  Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>
+#  Copyright (c) 2022, Citrix Systems, Inc.
+#
+#  SPDX-License-Identifier: BSD-2-Clause-Patent
+#
+##
+
+[Defines]
+  INF_VERSION                    = 1.29
+  BASE_NAME                      = DxeResetSystemLibXen
+  FILE_GUID                      = a5ac25e6-4dc5-4fd9-92cd-74e46bd2e72a
+  MODULE_TYPE                    = DXE_DRIVER
+  VERSION_STRING                 = 1.0
+  LIBRARY_CLASS                  = ResetSystemLib|DXE_DRIVER DXE_RUNTIME_DRIVER SMM_CORE DXE_SMM_DRIVER UEFI_DRIVER UEFI_APPLICATION
+  CONSTRUCTOR                    = DxeResetInit
+
+#
+# The following information is for reference only and not required by the build
+# tools.
+#
+#  VALID_ARCHITECTURES           = IA32 X64
+#
+
+[Sources]
+  DxeResetShutdownXen.c
+  ResetSystemLib.c
+
+[Packages]
+  MdeModulePkg/MdeModulePkg.dec
+  MdePkg/MdePkg.dec
+  OvmfPkg/OvmfPkg.dec
+
+[LibraryClasses]
+  BaseLib
+  DebugLib
+  IoLib
+  PcdLib
+  TimerLib
+  XenHypercallLib
+
+[Pcd]
+  gUefiOvmfPkgTokenSpaceGuid.PcdOvmfHostBridgePciDevId ## CONSUMES
diff --git a/OvmfPkg/OvmfXen.dsc b/OvmfPkg/OvmfXen.dsc
index c6fc3031ca..f6846c20ff 100644
--- a/OvmfPkg/OvmfXen.dsc
+++ b/OvmfPkg/OvmfXen.dsc
@@ -120,7 +120,7 @@
 [LibraryClasses]
   PcdLib|MdePkg/Library/BasePcdLibNull/BasePcdLibNull.inf
   TimerLib|MdePkg/Library/SecPeiDxeTimerLibCpu/SecPeiDxeTimerLibCpu.inf
-  ResetSystemLib|OvmfPkg/Library/ResetSystemLib/BaseResetSystemLib.inf
+  ResetSystemLib|OvmfPkg/Library/ResetSystemLib/BaseResetSystemLibXen.inf
   PrintLib|MdePkg/Library/BasePrintLib/BasePrintLib.inf
   BaseMemoryLib|MdePkg/Library/BaseMemoryLibRepStr/BaseMemoryLibRepStr.inf
   BaseLib|MdePkg/Library/BaseLib/BaseLib.inf
@@ -302,7 +302,7 @@
 
 [LibraryClasses.common.DXE_RUNTIME_DRIVER]
   PcdLib|MdePkg/Library/DxePcdLib/DxePcdLib.inf
-  ResetSystemLib|OvmfPkg/Library/ResetSystemLib/DxeResetSystemLib.inf
+  ResetSystemLib|OvmfPkg/Library/ResetSystemLib/DxeResetSystemLibXen.inf
   HobLib|MdePkg/Library/DxeHobLib/DxeHobLib.inf
   DxeCoreEntryPoint|MdePkg/Library/DxeCoreEntryPoint/DxeCoreEntryPoint.inf
   MemoryAllocationLib|MdePkg/Library/UefiMemoryAllocationLib/UefiMemoryAllocationLib.inf
@@ -315,7 +315,7 @@
 
 [LibraryClasses.common.UEFI_DRIVER]
   PcdLib|MdePkg/Library/DxePcdLib/DxePcdLib.inf
-  ResetSystemLib|OvmfPkg/Library/ResetSystemLib/DxeResetSystemLib.inf
+  ResetSystemLib|OvmfPkg/Library/ResetSystemLib/DxeResetSystemLibXen.inf
   HobLib|MdePkg/Library/DxeHobLib/DxeHobLib.inf
   DxeCoreEntryPoint|MdePkg/Library/DxeCoreEntryPoint/DxeCoreEntryPoint.inf
   MemoryAllocationLib|MdePkg/Library/UefiMemoryAllocationLib/UefiMemoryAllocationLib.inf
@@ -326,7 +326,7 @@
 [LibraryClasses.common.DXE_DRIVER]
   AcpiPlatformLib|OvmfPkg/Library/AcpiPlatformLib/DxeAcpiPlatformLib.inf
   PcdLib|MdePkg/Library/DxePcdLib/DxePcdLib.inf
-  ResetSystemLib|OvmfPkg/Library/ResetSystemLib/DxeResetSystemLib.inf
+  ResetSystemLib|OvmfPkg/Library/ResetSystemLib/DxeResetSystemLibXen.inf
   HobLib|MdePkg/Library/DxeHobLib/DxeHobLib.inf
   MemoryAllocationLib|MdePkg/Library/UefiMemoryAllocationLib/UefiMemoryAllocationLib.inf
   ReportStatusCodeLib|MdeModulePkg/Library/DxeReportStatusCodeLib/DxeReportStatusCodeLib.inf
@@ -346,7 +346,7 @@
 
 [LibraryClasses.common.UEFI_APPLICATION]
   PcdLib|MdePkg/Library/DxePcdLib/DxePcdLib.inf
-  ResetSystemLib|OvmfPkg/Library/ResetSystemLib/DxeResetSystemLib.inf
+  ResetSystemLib|OvmfPkg/Library/ResetSystemLib/DxeResetSystemLibXen.inf
   HobLib|MdePkg/Library/DxeHobLib/DxeHobLib.inf
   MemoryAllocationLib|MdePkg/Library/UefiMemoryAllocationLib/UefiMemoryAllocationLib.inf
   ReportStatusCodeLib|MdeModulePkg/Library/DxeReportStatusCodeLib/DxeReportStatusCodeLib.inf