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hw/arm/virt: Reject instantiation of multiple IOMMUs

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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>
Message-id: 20211210170415.583179-4-jean-philippe@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Jean-Philippe Brucker 2021-12-10 17:04:11 +00:00 committed by Peter Maydell
parent 092cba0350
commit 80d28ccdb9
1 changed files with 5 additions and 0 deletions
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5
hw/arm/virt.c
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@ -2493,6 +2493,11 @@ 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;