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charset="utf-8" xen-sysdev is a TYPE_SYS_BUS_DEVICE. bus_type should not be changed so that it can plug into the System bus. Otherwise this assert triggers: qemu-system-i386: hw/core/qdev.c:102: qdev_set_parent_bus: Assertion `dc->bus_type && object_dynamic_cast(OBJECT(bus), dc->bus_type)' failed. TYPE_XENBACKEND attaches to TYPE_XENSYSBUS, so its class_init needs to be set accordingly to attach the qdev. Otherwise the following assert triggers: qemu-system-i386: hw/core/qdev.c:102: qdev_set_parent_bus: Assertion `dc->bus_type && object_dynamic_cast(OBJECT(bus), dc->bus_type)' failed. TYPE_XENBACKEND is not a subclass of XEN_XENSYSDEV, so it's parent is just TYPE_DEVICE. Change that. Signed-off-by: Jason Andryuk --- hw/xen/xen-legacy-backend.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/hw/xen/xen-legacy-backend.c b/hw/xen/xen-legacy-backend.c index 2335ee2e65..c5c75c0064 100644 --- a/hw/xen/xen-legacy-backend.c +++ b/hw/xen/xen-legacy-backend.c @@ -789,11 +789,12 @@ static void xendev_class_init(ObjectClass *klass, voi= d *data) set_bit(DEVICE_CATEGORY_MISC, dc->categories); /* xen-backend devices can be plugged/unplugged dynamically */ dc->user_creatable =3D true; + dc->bus_type =3D TYPE_XENSYSBUS; } =20 static const TypeInfo xendev_type_info =3D { .name =3D TYPE_XENBACKEND, - .parent =3D TYPE_XENSYSDEV, + .parent =3D TYPE_DEVICE, .class_init =3D xendev_class_init, .instance_size =3D sizeof(struct XenLegacyDevice), }; @@ -824,7 +825,6 @@ static void xen_sysdev_class_init(ObjectClass *klass, v= oid *data) DeviceClass *dc =3D DEVICE_CLASS(klass); =20 device_class_set_props(dc, xen_sysdev_properties); - dc->bus_type =3D TYPE_XENSYSBUS; } =20 static const TypeInfo xensysdev_info =3D { --=20 2.25.1