diff --git a/ArmVirtPkg/ArmVirtCloudHv.dsc b/ArmVirtPkg/ArmVirtCloudHv.dsc
index 5cb2a609b1..d5055a0341 100644
--- a/ArmVirtPkg/ArmVirtCloudHv.dsc
+++ b/ArmVirtPkg/ArmVirtCloudHv.dsc
@@ -201,6 +201,9 @@
 [PcdsDynamicHii]
   gUefiOvmfPkgTokenSpaceGuid.PcdForceNoAcpi|L"ForceNoAcpi"|gOvmfVariableGuid|0x0|FALSE|NV,BS
 
+[PcdsPatchableInModule.common]
+  gArmTokenSpaceGuid.PcdMonitorConduitHvc|TRUE
+
 ################################################################################
 #
 # Components Section - list of all EDK II Modules needed by this Platform
diff --git a/ArmVirtPkg/ArmVirtQemu.dsc b/ArmVirtPkg/ArmVirtQemu.dsc
index 4498ca58a8..80dd4fbb14 100644
--- a/ArmVirtPkg/ArmVirtQemu.dsc
+++ b/ArmVirtPkg/ArmVirtQemu.dsc
@@ -293,6 +293,10 @@
   gEfiNetworkPkgTokenSpaceGuid.PcdIPv4PXESupport|0x01
   gEfiNetworkPkgTokenSpaceGuid.PcdIPv6PXESupport|0x01
 
+  # whether to use HVC or SMC to issue monitor calls - this typically depends
+  # on the exception level at which the UEFI system firmware executes
+  gArmTokenSpaceGuid.PcdMonitorConduitHvc|TRUE
+
   #
   # TPM2 support
   #
diff --git a/ArmVirtPkg/ArmVirtQemuKernel.dsc b/ArmVirtPkg/ArmVirtQemuKernel.dsc
index 94f48593c2..2700b97d09 100644
--- a/ArmVirtPkg/ArmVirtQemuKernel.dsc
+++ b/ArmVirtPkg/ArmVirtQemuKernel.dsc
@@ -203,6 +203,8 @@
   gArmTokenSpaceGuid.PcdFdBaseAddress|0x0
   gArmTokenSpaceGuid.PcdFvBaseAddress|0x0
 
+  gArmTokenSpaceGuid.PcdMonitorConduitHvc|TRUE
+
 [PcdsDynamicDefault.common]
   gEfiMdePkgTokenSpaceGuid.PcdPlatformBootTimeOut|3
 
diff --git a/ArmVirtPkg/ArmVirtXen.dsc b/ArmVirtPkg/ArmVirtXen.dsc
index 5809832e66..ceb37f8a2d 100644
--- a/ArmVirtPkg/ArmVirtXen.dsc
+++ b/ArmVirtPkg/ArmVirtXen.dsc
@@ -120,6 +120,8 @@
   gArmTokenSpaceGuid.PcdFdBaseAddress|0x0
   gArmTokenSpaceGuid.PcdFvBaseAddress|0x0
 
+  gArmTokenSpaceGuid.PcdMonitorConduitHvc|TRUE
+
 [PcdsDynamicDefault.common]
 
   gArmTokenSpaceGuid.PcdArmArchTimerSecIntrNum|0x0
diff --git a/ArmVirtPkg/Library/PlatformPeiLib/PlatformPeiLib.c b/ArmVirtPkg/Library/PlatformPeiLib/PlatformPeiLib.c
index 7ab4aa2d6b..b8e9208301 100644
--- a/ArmVirtPkg/Library/PlatformPeiLib/PlatformPeiLib.c
+++ b/ArmVirtPkg/Library/PlatformPeiLib/PlatformPeiLib.c
@@ -18,6 +18,8 @@
 #include <Library/FdtSerialPortAddressLib.h>
 #include <libfdt.h>
 
+#include <Chipset/AArch64.h>
+
 #include <Guid/EarlyPL011BaseAddress.h>
 #include <Guid/FdtHob.h>
 
@@ -224,5 +226,17 @@ PlatformPeim (
 
   BuildFvHob (PcdGet64 (PcdFvBaseAddress), PcdGet32 (PcdFvSize));
 
+ #ifdef MDE_CPU_AARCH64
+  //
+  // Set the SMCCC conduit to SMC if executing at EL2, which is typically the
+  // exception level that services HVCs rather than the one that invokes them.
+  //
+  if (ArmReadCurrentEL () == AARCH64_EL2) {
+    Status = PcdSetBoolS (PcdMonitorConduitHvc, FALSE);
+    ASSERT_EFI_ERROR (Status);
+  }
+
+ #endif
+
   return EFI_SUCCESS;
 }
diff --git a/ArmVirtPkg/Library/PlatformPeiLib/PlatformPeiLib.inf b/ArmVirtPkg/Library/PlatformPeiLib/PlatformPeiLib.inf
index e9a34b6e2e..a38b89c103 100644
--- a/ArmVirtPkg/Library/PlatformPeiLib/PlatformPeiLib.inf
+++ b/ArmVirtPkg/Library/PlatformPeiLib/PlatformPeiLib.inf
@@ -45,6 +45,7 @@
 
 [Pcd]
   gArmTokenSpaceGuid.PcdFvBaseAddress
+  gArmTokenSpaceGuid.PcdMonitorConduitHvc
   gEfiSecurityPkgTokenSpaceGuid.PcdTpmBaseAddress             ## SOMETIMES_PRODUCES
   gUefiOvmfPkgTokenSpaceGuid.PcdDeviceTreeInitialBaseAddress