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

[Paolo Bonzini <pbonzini@redhat.com>]

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[*].

Paolo