Recent cleanup in commit
a028dd423ee6 dropped the ICPStateClass::reset
handler. It is now up to child ICP classes to call the DeviceClass::reset
handler of the parent class, thanks to device_class_set_parent_reset().
This is a better object programming pattern, but unfortunately it causes
QEMU to crash during CPU hotplug:
(qemu) device_add host-spapr-cpu-core,id=core1,core-id=1
Segmentation fault (core dumped)
When the hotplug path tries to reset the ICP device, we end up calling:
static void icp_kvm_reset(DeviceState *dev)
{
ICPStateClass *icpc = ICP_GET_CLASS(dev);
icpc->parent_reset(dev);
but icpc->parent_reset is NULL... This happens because icp_kvm_class_init()
calls:
device_class_set_parent_reset(dc, icp_kvm_reset,
&icpc->parent_reset);
but dc->reset, ie, DeviceClass::reset for the TYPE_ICP type, is
itself NULL.
This patch hence sets DeviceClass::reset for the TYPE_ICP type to
point to icp_reset(). It then registers a reset handler that calls
DeviceClass::reset. If the ICP subtype has configured its own reset
handler with device_class_set_parent_reset(), this ensures it will
be called first and it can then call ICPStateClass::parent_reset
safely. This fixes the reset path for the TYPE_KVM_ICP type, which
is the only subtype that defines its own reset function.
Reported-by: Satheesh Rajendran <sathnaga@linux.vnet.ibm.com>
Suggested-by: David Gibson <david@gibson.dropbear.id.au>
Fixes: a028dd423ee6dfd091a8c63028240832bf10f671
Signed-off-by: Greg Kurz <groug@kaod.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
},
};
-static void icp_reset(void *dev)
+static void icp_reset(DeviceState *dev)
{
ICPState *icp = ICP(dev);
qemu_set_irq(icp->output, 0);
}
+static void icp_reset_handler(void *dev)
+{
+ DeviceClass *dc = DEVICE_GET_CLASS(dev);
+
+ dc->reset(dev);
+}
+
static void icp_realize(DeviceState *dev, Error **errp)
{
ICPState *icp = ICP(dev);
return;
}
- qemu_register_reset(icp_reset, dev);
+ qemu_register_reset(icp_reset_handler, dev);
vmstate_register(NULL, icp->cs->cpu_index, &vmstate_icp_server, icp);
}
ICPState *icp = ICP(dev);
vmstate_unregister(NULL, &vmstate_icp_server, icp);
- qemu_unregister_reset(icp_reset, dev);
+ qemu_unregister_reset(icp_reset_handler, dev);
}
static void icp_class_init(ObjectClass *klass, void *data)
dc->realize = icp_realize;
dc->unrealize = icp_unrealize;
+ dc->reset = icp_reset;
}
static const TypeInfo icp_info = {