[PATCH v6 08/13] hw/arm: virt: cleanly fail on attempt to use the platform vGIC together with ITS

[Mohamed Mediouni <mohamed@unpredictable.fr>]

Apple's platform vGIC doesn't support ITS. Deal with this by reporting to the user and not creating the ITS device.

Regular configuration: GICv3 + ITS
Resulting configuration here: GICv3 with no MSIs
And its=off explicitly for the newest machine version: GICv3 + GICv2m

Signed-off-by: Mohamed Mediouni <mohamed@unpredictable.fr>
---
 hw/arm/virt.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/hw/arm/virt.c b/hw/arm/virt.c
index 91d8cd9363..005e923a22 100644
--- a/hw/arm/virt.c
+++ b/hw/arm/virt.c
@@ -740,6 +740,16 @@ static void create_its(VirtMachineState *vms)
         return;
     }
 
+    if (hvf_enabled() && hvf_irqchip_in_kernel() && vms->tcg_its) {
+        /*
+         * In the HVF case, inform the user that they can use the
+         * user-mode GIC if they want to have an ITS.
+         */
+        info_report("ITS not supported without kernel-irqchip=off on HVF");
+        info_report("Disabling ITS");
+        return;
+    }
+
     dev = qdev_new(its_class_name());
 
     object_property_set_link(OBJECT(dev), "parent-gicv3", OBJECT(vms->gic),
-- 
2.39.5 (Apple Git-154)