Signed-off-by: Mohamed Mediouni <mohamed@unpredictable.fr>
---
 target/arm/whpx/whpx-all.c | 37 +++++++++++++++++++++++++++++++++++++
 1 file changed, 37 insertions(+)

diff --git a/target/arm/whpx/whpx-all.c b/target/arm/whpx/whpx-all.c
index c5b108166a..513551bec1 100644
--- a/target/arm/whpx/whpx-all.c
+++ b/target/arm/whpx/whpx-all.c
@@ -940,6 +940,43 @@ int whpx_accel_init(AccelState *as, MachineState *ms)
         goto error;
     }
 
+    /* Enable synthetic processor features */
+    WHV_SYNTHETIC_PROCESSOR_FEATURES_BANKS synthetic_features;
+    memset(&synthetic_features, 0, sizeof(WHV_SYNTHETIC_PROCESSOR_FEATURES_BANKS));
+    synthetic_features.BanksCount = 1;
+
+    synthetic_features.Bank0.HypervisorPresent = 1;
+    synthetic_features.Bank0.Hv1 = 1;
+    synthetic_features.Bank0.AccessVpRunTimeReg = 1;
+    synthetic_features.Bank0.AccessPartitionReferenceCounter = 1;
+    synthetic_features.Bank0.AccessPartitionReferenceTsc = 1;
+    synthetic_features.Bank0.AccessHypercallRegs = 1;
+    synthetic_features.Bank0.AccessVpIndex = 1;
+    synthetic_features.Bank0.AccessHypercallRegs = 1;
+    synthetic_features.Bank0.TbFlushHypercalls = 1;
+    synthetic_features.Bank0.AccessSynicRegs = 1;
+    synthetic_features.Bank0.AccessSyntheticTimerRegs = 1;
+    synthetic_features.Bank0.AccessIntrCtrlRegs = 1;
+    synthetic_features.Bank0.SyntheticClusterIpi = 1;
+    synthetic_features.Bank0.DirectSyntheticTimers = 1;
+
+    /*
+     * On ARM64, have enlightenments off by default
+     * as they're not needed for performance.
+     */
+    if (whpx->hyperv_enlightenments_required) {
+        hr = whp_dispatch.WHvSetPartitionProperty(
+                whpx->partition,
+                WHvPartitionPropertyCodeSyntheticProcessorFeaturesBanks,
+                &synthetic_features,
+                sizeof(WHV_SYNTHETIC_PROCESSOR_FEATURES_BANKS));
+        if (FAILED(hr)) {
+            error_report("WHPX: Failed to set synthetic features, hr=%08lx", hr);
+            ret = -EINVAL;
+            goto error;
+        }
+    }
+
     hr = whp_dispatch.WHvSetupPartition(whpx->partition);
     if (FAILED(hr)) {
         error_report("WHPX: Failed to setup partition, hr=%08lx", hr);
-- 
2.50.1 (Apple Git-155)