This combination is not allowed as of build 26300.7939 and results in:

qemu-system-x86_64.exe: WHPX: Failed to setup partition, hr=c0350005
qemu-system-x86_64.exe: failed to initialize whpx: Invalid argument

Signed-off-by: Mohamed Mediouni <mohamed@unpredictable.fr>
---
 target/i386/whpx/whpx-all.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/target/i386/whpx/whpx-all.c b/target/i386/whpx/whpx-all.c
index bb1afb9cd1..99c4d03f42 100644
--- a/target/i386/whpx/whpx-all.c
+++ b/target/i386/whpx/whpx-all.c
@@ -2145,7 +2145,7 @@ int whpx_accel_init(AccelState *as, MachineState *ms)
         goto error;
     }
 
-    if (processor_features.Bank1.NestedVirtSupport) {
+    if (whpx_irqchip_in_kernel() && processor_features.Bank1.NestedVirtSupport) {
         memset(&prop, 0, sizeof(WHV_PARTITION_PROPERTY));
         prop.NestedVirtualization = 1;
         hr = whp_dispatch.WHvSetPartitionProperty(
-- 
2.50.1 (Apple Git-155)