Re: [PATCH v1 1/7] xen-block: Do not write frontend nodes

[David Woodhouse <dwmw2@xxxxxxxxxxxxx>]

On 11 November 2023 16:51:22 GMT-05:00, Andrew Cooper 
<andrew.cooper3@xxxxxxxxxx> wrote:
>On 11/11/2023 8:18 pm, David Woodhouse wrote:
>> On 11 November 2023 08:43:40 GMT-05:00, Andrew Cooper 
>> <andrew.cooper3@xxxxxxxxxx> wrote:
>>> Furthermore, the control domain doesn't always have the domid of 0.
>>>
>>> If qemu wants/needs to make changes like this, the control domain has to
>>> arrange for qemu's domain to have appropriate permissions on the nodes.
>> Right. And that's simple enough: if you are running QEMU in a domain which 
>> doesn't have permission to create the backend directory and/or the frontend 
>> nodes, don't ask it to *create* devices. In that case it is only able to 
>> connect as the backend for devices which were created *for* it by the 
>> toolstack.
>>
>> The criterion used in this patch series should be "did QEMU create this 
>> device, or discover it".
>>
>
>Yeah, that sounds like the right approach.

I think we want to kill the xen_backend_set_device() function and instead set 
the backend as a property of the XenDevice *before* realizing it.