vfio/container: Implement HostIOMMUDeviceClass::get_cap() handler

Suggested-by: Cédric Le Goater <clg@redhat.com>
Signed-off-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>

diff --git a/hw/vfio/container.c b/hw/vfio/container.c
index 2f62c13214412618b412240b61efcbe1b1c79ed5..99beeba422ebfe49caed4fcd57afe5514dea8b39 100644 (file)
--- a/hw/vfio/container.c
+++ b/hw/vfio/container.c
@@ -1147,11 +1147,26 @@ static bool hiod_legacy_vfio_realize(HostIOMMUDevice *hiod, void *opaque,
     return true;
 }
 
+static int hiod_legacy_vfio_get_cap(HostIOMMUDevice *hiod, int cap,
+                                    Error **errp)
+{
+    HostIOMMUDeviceCaps *caps = &hiod->caps;
+
+    switch (cap) {
+    case HOST_IOMMU_DEVICE_CAP_AW_BITS:
+        return caps->aw_bits;
+    default:
+        error_setg(errp, "%s: unsupported capability %x", hiod->name, cap);
+        return -EINVAL;
+    }
+}
+
 static void hiod_legacy_vfio_class_init(ObjectClass *oc, void *data)
 {
     HostIOMMUDeviceClass *hioc = HOST_IOMMU_DEVICE_CLASS(oc);
 
     hioc->realize = hiod_legacy_vfio_realize;
+    hioc->get_cap = hiod_legacy_vfio_get_cap;
 };
 
 static const TypeInfo types[] = {