Re: active swapping using rumpdisk

On 16/08/2025 23:28, Samuel Thibault wrote:
> HEllo,
>
> Michael Kelly, le sam. 16 août 2025 20:29:57 +0100, a ecrit:
>>    ipc_kobject_set (bd->port, (ipc_kobject_t) &bd->device, IKOT_DEVICE);
>>
>> I cannot see a simple method of achieving the same in rumpdisk
> We can add one :)
>
> I'm however thinking that we should probably not conflate IKOT_DEVICE
> with a user-level one, because IKOT_DEVICE may be used for more than
> what we think, see e.g. dev_port_lookup, ipc_kobject_notify. But we can
> add another IKOT_USER_DEVICE, and add it to ipc_kobject_vm_page_list,
> and add a mach call (restricted to privileged tasks) to set this type.

I'd expected that something new would be needed but didn't want to 
embarrass myself by not spotting the obvious!

I can implement, test and supply patches in due course. It would help me 
if you can identify the most appropriate message set to add this new 
mach call to and how generalised it should be. ie. be able to set the 
port IKOT type to one of several (possibly future) options or just to 
IKOT_USER_DEVICE/IKOT_NONE.

Regards,

Mike.