Re: [RFC PATCH 2/2] hw/i386/sgx: Attach SGX-EPC to its memory backend

[Yang Zhong <yang.zhong@intel.com>]

On Mon, Jan 17, 2022 at 12:48:10PM +0100, Paolo Bonzini wrote:
> On 1/17/22 00:53, Philippe Mathieu-Daudé via wrote:
> >We have one SGX-EPC address/size/node per memory backend,
> >make it child of the backend in the QOM composition tree.
> >
> >Cc: Yang Zhong <yang.zhong@intel.com>
> >Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
> >---
> >  hw/i386/sgx.c | 3 +++
> >  1 file changed, 3 insertions(+)
> >
> >diff --git a/hw/i386/sgx.c b/hw/i386/sgx.c
> >index 5de5dd08936..6362e5e9d02 100644
> >--- a/hw/i386/sgx.c
> >+++ b/hw/i386/sgx.c
> >@@ -300,6 +300,9 @@ void pc_machine_init_sgx_epc(PCMachineState *pcms)
> >          /* set the memdev link with memory backend */
> >          object_property_parse(obj, SGX_EPC_MEMDEV_PROP, list->value->memdev,
> >                                &error_fatal);
> >+        object_property_add_child(OBJECT(list->value->memdev), "sgx-epc",
> >+                                  OBJECT(obj));
> >+
> >          /* set the numa node property for sgx epc object */
> >          object_property_set_uint(obj, SGX_EPC_NUMA_NODE_PROP, list->value->node,
> >                               &error_fatal);
> 
> I don't think this is a good idea; only list->value->memdev should
> add something below itself in the tree.
> 
> However, I think obj can be added under the machine itself as
> /machine/sgx-epc-device[*].
> 

  Thanks Philippe, calling object_property_add_child() in the hw/i386/sgx.c is more
  reasonable than in device_set_realized(), thanks!

  Yang

> Paolo