On 4/8/25 16:23, Mohamed Mediouni wrote:
Windows Hypervisor Platform's vGIC doesn't support ITS.
Deal with this by reporting to the user and not creating the ITS device.
Signed-off-by: Mohamed Mediouni <moha...@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 98a1c74c42..0039f6a12b 100644
--- a/hw/arm/virt.c
+++ b/hw/arm/virt.c
@@ -741,6 +741,16 @@ static void create_its(VirtMachineState *vms)
return;
}
+ if (whpx_enabled() && vms->tcg_its) {
+ /*
+ * Signal to the user when ITS is neither supported by the host
+ * nor emulated by the machine.
+ */
+ info_report("ITS not supported on WHPX.");
+ info_report("To support MSIs, use its=off to enable GICv3 + GICv2m.");
So if the users deliberately asks for its=on, we ignore the request and
keep going. Shouldn't we just exit so the user adapts its command line?
+ return;
+ }
+
dev = qdev_new(its_class_name());
object_property_set_link(OBJECT(dev), "parent-gicv3", OBJECT(vms->gic),
