diff mbox series

[v7,3/8] hw/arm/virt: Reject instantiation of multiple IOMMUs

Message ID 20211210170415.583179-4-jean-philippe@linaro.org (mailing list archive)
State New, archived
Headers show
Series virtio-iommu: Add ACPI support (Arm part + tests) | expand

Commit Message

Jean-Philippe Brucker Dec. 10, 2021, 5:04 p.m. UTC 
We do not support instantiating multiple IOMMUs. Before adding a
virtio-iommu, check that no other IOMMU is present. This will detect
both "iommu=smmuv3" machine parameter and another virtio-iommu instance.

Fixes: 70e89132c9 ("hw/arm/virt: Add the virtio-iommu device tree mappings")
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Reviewed-by: Igor Mammedov <imammedo@redhat.com>
Signed-off-by: Jean-Philippe Brucker <jean-philippe@linaro.org>
---
 hw/arm/virt.c | 5 +++++
 1 file changed, 5 insertions(+)
diff mbox series

Patch

diff --git a/hw/arm/virt.c b/hw/arm/virt.c
index 53941e4aac..608a0a78f0 100644
--- a/hw/arm/virt.c
+++ b/hw/arm/virt.c
@@ -2494,6 +2494,11 @@  static void virt_machine_device_pre_plug_cb(HotplugHandler *hotplug_dev,
         hwaddr db_start = 0, db_end = 0;
         char *resv_prop_str;
 
+        if (vms->iommu != VIRT_IOMMU_NONE) {
+            error_setg(errp, "virt machine does not support multiple IOMMUs");
+            return;
+        }
+
         switch (vms->msi_controller) {
         case VIRT_MSI_CTRL_NONE:
             return;